From: Roland Pesch Date: Wed, 20 Feb 1991 01:57:12 +0000 (+0000) Subject: (1) formatting cleanup to permit @smallbook X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=54e4a398e36e7dbc1b6d66b7dae65a7885ccc108;p=binutils-gdb.git (1) formatting cleanup to permit @smallbook (2) moved GPL to end (3) @index{foo} -> @cindex{foo} --- diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo index 407a8cd6328..a8d90b6d456 100644 --- a/gdb/doc/gdb.texinfo +++ b/gdb/doc/gdb.texinfo @@ -30,7 +30,7 @@ except that the section entitled ``GNU General Public License'' may be included in a translation approved by the author instead of in the original English. @end ifinfo - +@c @smallbook @setchapternewpage odd @settitle Using GDB (v4.0) @titlepage @@ -75,7 +75,7 @@ original English. @end titlepage @page -@node Top, Top, Top, (DIR) +@node Top, New Features, (dir), (dir) @unnumbered Summary of GDB The purpose of a debugger such as GDB is to allow you to see what is @@ -106,31 +106,128 @@ is being implemented, and Fortran support will be added when a GNU Fortran compiler is written. @menu -* New Features:: What's new in GDB 4.0 -* License:: The GNU General Public License gives you permission - to redistribute GDB on certain terms; and also - explains that there is no warranty. -* User Interface:: GDB command syntax and input and output conventions. -* Files:: Specifying files for GDB to operate on. -* Options:: GDB arguments and options. -* Compilation::Compiling your program so you can debug it. -* Running:: Running your program under GDB. -* Stopping:: Making your program stop. Why it may stop. What to do then. -* Stack:: Examining your program's stack. -* Source:: Examining your program's source files. -* Data:: Examining data in your program. -* Symbols:: Examining the debugger's symbol table. -* Altering:: Altering things in your program. -* Sequences:: Canned command sequences for repeated use. -* Emacs:: Using GDB through GNU Emacs. -* Remote:: Remote debugging across a serial line or TCP/IP. -* GDB Bugs:: How to report bugs (if you want to get them fixed). -* Installing GDB:: How to set up GDB for your host and target -* Commands:: Index of GDB commands. -* Concepts:: Index of GDB concepts. +* New Features:: New Features in GDB version 4.0 +* User Interface:: GDB Commands and Displays +* Files:: Specifying GDB's Files +* Compilation:: Compiling Your Program for Debugging +* Targets:: Specifying a Debugging Target +* Running:: Running Your Program Under GDB +* Stopping:: Stopping and Continuing +* Stack:: Examining the Stack +* Source:: Examining Source Files +* Data:: Examining Data +* Symbols:: Examining the Symbol Table +* Altering:: Altering Execution +* Sequences:: Canned Sequences of Commands +* Options:: Options and Arguments for GDB +* Emacs:: Using GDB under GNU Emacs +* Remote:: Remote Debugging +* GDB Bugs:: Reporting Bugs in GDB +* Installing GDB:: Installing GDB +* License:: GNU GENERAL PUBLIC LICENSE +* Commands:: Command Index +* Concepts:: Index + + --- The Detailed Node Listing --- + +Specifying GDB's Files + +* File Arguments:: Specifying Files with Arguments +* File Commands:: Specifying Files with Commands + +Running Your Program Under GDB + +* Arguments:: Specifying the arguments for your program. +* Environment:: Specifying the environment for your program. +* Working Directory:: Specifying the working directory for giving + to your program when it is run. +* Input/Output:: Specifying the program's standard input and output. +* Attach:: Debugging a process started outside GDB. +* Kill Process:: Getting rid of the child process running your program. + +Stopping and Continuing + +* Signals:: Fatal signals in your program just stop it; + then you can use GDB to see what is going on. +* Breakpoints:: Breakpoints let you stop your program when it + reaches a specified point in the code. + an expression changes. +* Continuing:: Resuming execution until the next signal or breakpoint. +* Stepping:: Stepping runs the program a short distance and + then stops it wherever it has come to. + +Breakpoints + +* Set Breaks:: How to establish breakpoints. +* Exception Handling:: How GDB supports exception handling for C++. +* Delete Breaks:: How to remove breakpoints no longer needed. +* Disabling:: How to disable breakpoints (turn them off temporarily). +* Conditions:: Making extra conditions on whether to stop. +* Break Commands:: Commands to be executed at a breakpoint. +* Error in Breakpoints:: + +Examining the Stack + +* Frames:: Explanation of stack frames and terminology. +* Backtrace:: Summarizing many frames at once. +* Selection:: How to select a stack frame. +* Frame Info:: Information on a Frame + +Examining Source Files + +* List:: Using the @samp{list} command to print source files. +* Search:: Commands for searching source files. +* Source Path:: Specifying the directories to search for source files. + +Examining Data + +* Expressions:: Expressions that can be computed and printed. +* Variables:: Using your program's variables in expressions. +* Arrays:: Examining part of memory as an array. +* Format options:: Controlling how structures and arrays are printed. +* Output formats:: Specifying formats for printing values. +* Auto Display:: Printing certain expressions whenever program stops. +* Value History:: Referring to values previously printed. +* Convenience Vars:: Giving names to values for future reference. +* Registers:: Referring to and storing in machine registers. + +Output formats + +* Memory:: Examining Memory + +Altering Execution + +* Assignment:: Altering variable values or memory contents. +* Jumping:: Altering control flow. +* Signaling:: Making signals happen in the program. +* Returning:: Making a function return prematurely. +* Calling:: Calling functions from your program + +Canned Sequences of Commands + +* Define:: User-defined commands. +* Command Files:: Command files. +* Output:: Controlled output commands useful in + user-defined commands and command files. + +Options and Arguments for GDB + +* Mode Options:: Options controlling modes of operation. +* File Options:: Options to specify files (executable, coredump, commands) +* Other Arguments:: Any other arguments without options + also specify files. + +Remote Debugging + +* Remote Commands:: Commands used to start and finish remote debugging. + +Reporting Bugs in GDB + +* Bug Criteria:: Have You Found a Bug? +* Bug Reporting:: How to Report Bugs @end menu -@node New Features, License, Top, Top +@node New Features, User Interface, Top, Top @unnumbered New Features in GDB version 4.0 @itemize @bullet @@ -196,455 +293,155 @@ HPPA architecture support. @end itemize +@node User Interface, Files, New Features, Top +@chapter GDB Commands and Displays +GDB is invoked with the shell command @samp{gdb}. Once started, it reads +commands from the terminal until you tell it to exit. -@node License, User Interface, New Features, Top -@unnumbered GNU GENERAL PUBLIC LICENSE -@center Version 1, February 1989 +A GDB command is a single line of input. There is no limit on how long +it can be. It starts with a command name, which is followed by arguments +whose meaning depends on the command name. For example, the command +@samp{step} accepts an argument which is the number of times to step, +as in @samp{step 5}. You can also use the @samp{step} command with +no arguments. Some command names do not allow any arguments. -@display -Copyright @copyright{} 1989 Free Software Foundation, Inc. -675 Mass Ave, Cambridge, MA 02139, USA +@cindex abbreviation +GDB command names may always be truncated if that abbreviation is +unambiguous. Other possible command abbreviations are listed in the +documentation of the individual commands. Sometimes even ambiguous +abbreviations are allowed; for example, @samp{s} is specially defined as +equivalent to @samp{step} even though there are other commands whose +names start with @samp{s}. -Everyone is permitted to copy and distribute verbatim copies -of this license document, but changing it is not allowed. -@end display +@cindex repeating commands +A blank line as input to GDB means to repeat the previous command. +Certain commands will not repeat this way; these are commands for which +unintentional repetition might cause trouble and which you are unlikely +to want to repeat. Certain others (@samp{list} and @samp{x}) act +differently when repeated because that is more useful. -@unnumberedsec Preamble +@kindex # +@cindex comment +A line of input starting with @samp{#} is a comment; it does nothing. +This is useful mainly in command files (@xref{Command Files}). - The license agreements of most software companies try to keep users -at the mercy of those companies. By contrast, our General Public -License is intended to guarantee your freedom to share and change free -software---to make sure the software is free for all its users. The -General Public License applies to the Free Software Foundation's -software and to any other program whose authors commit to using it. -You can use it for your programs, too. +@cindex online documentation +@kindex help +@table @code +@item help +@itemx help @var{category} +@itemx help @var{command} +You can always ask GDB itself for information on its commands, using the +command @samp{help}. With a command name as argument, it will display a +paragraph on how to use the command. Used with no arguments, +@samp{help} displays a short list of named categories of commands; you +can then use @samp{help @var{category}} to list the individual commands +in a category. - When we speak of free software, we are referring to freedom, not -price. Specifically, the General Public License is designed to make -sure that you have the freedom to give away or sell copies of free -software, that you receive source code or can get it if you want it, -that you can change the software or use pieces of it in new free -programs; and that you know you can do these things. +@kindex info version +@item info version +As GDB evolves, new commands are introduced, and old ones may wither +away. If multiple versions of GDB are in use at your site, it may +occasionally be useful to make sure what version of GDB you're running. +GDB announces its version whenever it starts up; but you can make it +repeat this information with the @samp{info version} command. +@end table - To protect your rights, we need to make restrictions that forbid -anyone to deny you these rights or to ask you to surrender the rights. -These restrictions translate to certain responsibilities for you if you -distribute copies of the software, or if you modify it. +@cindex prompt +GDB indicates its readiness to read a command by printing a string +called the @dfn{prompt}. This string is normally @samp{(gdb)}. You can +change the prompt string with the @samp{set prompt} command. For +instance, when debugging GDB with GDB, it is useful to change the prompt +in one of the GDBs so that you tell which one you are talking to. - For example, if you distribute copies of a such a program, whether -gratis or for a fee, you must give the recipients all the rights that -you have. You must make sure that they, too, receive or can get the -source code. And you must tell them their rights. +@table @code +@item set prompt @var{newprompt} +@kindex set prompt +Directs GDB to use @var{newprompt} as its prompt string henceforth. +@kindex show prompt +@item show prompt +Prints a line of the form: @samp{Gdb's prompt is: @var{your-prompt}} +@end table - We protect your rights with two steps: (1) copyright the software, and -(2) offer you this license which gives you legal permission to copy, -distribute and/or modify the software. +@cindex exiting GDB +@kindex quit +To exit GDB, use the @samp{quit} command (abbreviated @samp{q}), or type +an end-of-file character (usually @ctrl{d}). An interrupt (often +@ctrl{c}) will not exit from GDB, but rather will terminate the action +of any GDB command that is in progress and return to GDB command level. +It is safe to type the interrupt character at any time because GDB does +not allow it to take effect until a time when it is safe. - Also, for each author's protection and ours, we want to make certain -that everyone understands that there is no warranty for this free -software. If the software is modified by someone else and passed on, we -want its recipients to know that what they have is not the original, so -that any problems introduced by others will not reflect on the original -authors' reputations. +@cindex readline +@cindex command line editing +@cindex history substitution +GDB reads its input commands via the @code{readline} interface. This +GNU library provides consistent behavior for programs which provide a +command line interface to the user. Advantages are @samp{emacs}-style +or @samp{vi}-style inline editing of commands, @samp{csh}-like history +substitution, and a storage and recall of command history across +debugging sessions. - The precise terms and conditions for copying, distribution and -modification follow. +You may control the behavior of command line editing in GDB with the +command @samp{set}. You may check the status of any of these settings +with the command @samp{show}. -@iftex -@unnumberedsec TERMS AND CONDITIONS -@end iftex -@ifinfo -@center TERMS AND CONDITIONS -@end ifinfo +@table @code +@kindex set editing +@cindex editing +@item set editing +@itemx set editing on +Enable command line editing (enabled by default). -@enumerate -@item -This License Agreement applies to any program or other work which -contains a notice placed by the copyright holder saying it may be -distributed under the terms of this General Public License. The -``Program'', below, refers to any such program or work, and a ``work based -on the Program'' means either the Program or any work containing the -Program or a portion of it, either verbatim or with modifications. Each -licensee is addressed as ``you''. +@item set editing off +Disable command line editing. -@item -You may copy and distribute verbatim copies of the Program's source -code as you receive it, in any medium, provided that you conspicuously and -appropriately publish on each copy an appropriate copyright notice and -disclaimer of warranty; keep intact all the notices that refer to this -General Public License and to the absence of any warranty; and give any -other recipients of the Program a copy of this General Public License -along with the Program. You may charge a fee for the physical act of -transferring a copy. +@kindex show editing +@item show editing +Show whether command line editing is enabled. -@item -You may modify your copy or copies of the Program or any portion of -it, and copy and distribute such modifications under the terms of Paragraph -1 above, provided that you also do the following: +@cindex history file +@kindex set history file +@item set history file @var{filename} +Set the name of the GDB command history file to @samp{filename}. This is +the file from which GDB will read an initial command history +list or to which it will write this list when it exits. This list is +accessed through history expansion or through the history +command editing characters listed below. This file defaults to the +value of the environmental variable @code{GDBHISTFILE}, or to +@code{./.gdb_history} if this variable is not set. -@itemize @bullet -@item -cause the modified files to carry prominent notices stating that -you changed the files and the date of any change; and +@cindex history write +@kindex set history write +@item set history write +@itemx set history write on +Make GDB record command history in a file, whose name may be specified with the +@samp{set history file} command. By default, this option is disabled. -@item -cause the whole of any work that you distribute or publish, that -in whole or in part contains the Program or any part thereof, either -with or without modifications, to be licensed at no charge to all -third parties under the terms of this General Public License (except -that you may choose to grant warranty protection to some or all -third parties, at your option). +@item set history write off +Make GDB stop recording command history in a file. -@item -If the modified program normally reads commands interactively when -run, you must cause it, when started running for such interactive use -in the simplest and most usual way, to print or display an -announcement including an appropriate copyright notice and a notice -that there is no warranty (or else, saying that you provide a -warranty) and that users may redistribute the program under these -conditions, and telling the user how to view a copy of this General -Public License. +@cindex history size +@kindex set history size +@item set history size @var{size} +Set the number of commands which GDB will keep in its history list. +This defaults to the value of the environmental variable +@code{HISTSIZE}, or to 256 if this variable is not set. +@end table -@item -You may charge a fee for the physical act of transferring a -copy, and you may at your option offer warranty protection in -exchange for a fee. -@end itemize +@cindex history expansion +History expansion assigns special meaning to the character @samp{!} +(@pxref{Event Designators}). Since @samp{!} is also the logical not +operator in C, history expansion is off by default. If you decide to +enable history expansion with the @samp{set history expansion on} +command, you may sometimes need to follow @samp{!} (when it is used as +logical not, in an expression) with a space or a tab to prevent it from +being expanded. The @code{readline} history facilities will not attempt +substitution on the strings @samp{!=} and @samp{!(}, even when history +expansion is enabled. -Mere aggregation of another independent work with the Program (or its -derivative) on a volume of a storage or distribution medium does not bring -the other work under the scope of these terms. - -@item -You may copy and distribute the Program (or a portion or derivative of -it, under Paragraph 2) in object code or executable form under the terms of -Paragraphs 1 and 2 above provided that you also do one of the following: - -@itemize @bullet -@item -accompany it with the complete corresponding machine-readable -source code, which must be distributed under the terms of -Paragraphs 1 and 2 above; or, - -@item -accompany it with a written offer, valid for at least three -years, to give any third party free (except for a nominal charge -for the cost of distribution) a complete machine-readable copy of the -corresponding source code, to be distributed under the terms of -Paragraphs 1 and 2 above; or, - -@item -accompany it with the information you received as to where the -corresponding source code may be obtained. (This alternative is -allowed only for noncommercial distribution and only if you -received the program in object code or executable form alone.) -@end itemize - -Source code for a work means the preferred form of the work for making -modifications to it. For an executable file, complete source code means -all the source code for all modules it contains; but, as a special -exception, it need not include source code for modules which are standard -libraries that accompany the operating system on which the executable -file runs, or for standard header files or definitions files that -accompany that operating system. - -@item -You may not copy, modify, sublicense, distribute or transfer the -Program except as expressly provided under this General Public License. -Any attempt otherwise to copy, modify, sublicense, distribute or transfer -the Program is void, and will automatically terminate your rights to use -the Program under this License. However, parties who have received -copies, or rights to use copies, from you under this General Public -License will not have their licenses terminated so long as such parties -remain in full compliance. - -@item -By copying, distributing or modifying the Program (or any work based -on the Program) you indicate your acceptance of this license to do so, -and all its terms and conditions. - -@item -Each time you redistribute the Program (or any work based on the -Program), the recipient automatically receives a license from the original -licensor to copy, distribute or modify the Program subject to these -terms and conditions. You may not impose any further restrictions on the -recipients' exercise of the rights granted herein. - -@item -The Free Software Foundation may publish revised and/or new versions -of the General Public License from time to time. Such new versions will -be similar in spirit to the present version, but may differ in detail to -address new problems or concerns. - -Each version is given a distinguishing version number. If the Program -specifies a version number of the license which applies to it and ``any -later version'', you have the option of following the terms and conditions -either of that version or of any later version published by the Free -Software Foundation. If the Program does not specify a version number of -the license, you may choose any version ever published by the Free Software -Foundation. - -@item -If you wish to incorporate parts of the Program into other free -programs whose distribution conditions are different, write to the author -to ask for permission. For software which is copyrighted by the Free -Software Foundation, write to the Free Software Foundation; we sometimes -make exceptions for this. Our decision will be guided by the two goals -of preserving the free status of all derivatives of our free software and -of promoting the sharing and reuse of software generally. - -@iftex -@heading NO WARRANTY -@end iftex -@ifinfo -@center NO WARRANTY -@end ifinfo - -@item -BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY -FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN -OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES -PROVIDE THE PROGRAM ``AS IS'' WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED -OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF -MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS -TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE -PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, -REPAIR OR CORRECTION. - -@item -IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL -ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR -REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, -INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES -ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT -LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES -SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE -WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN -ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. -@end enumerate - -@iftex -@heading END OF TERMS AND CONDITIONS -@end iftex -@ifinfo -@center END OF TERMS AND CONDITIONS -@end ifinfo - -@page -@unnumberedsec Appendix: How to Apply These Terms to Your New Programs - - If you develop a new program, and you want it to be of the greatest -possible use to humanity, the best way to achieve this is to make it -free software which everyone can redistribute and change under these -terms. - - To do so, attach the following notices to the program. It is safest to -attach them to the start of each source file to most effectively convey -the exclusion of warranty; and each file should have at least the -``copyright'' line and a pointer to where the full notice is found. - -@smallexample -@var{one line to give the program's name and a brief idea of what it does.} -Copyright (C) 19@var{yy} @var{name of author} - -This program is free software; you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation; either version 1, or (at your option) -any later version. - -This program is distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -GNU General Public License for more details. - -You should have received a copy of the GNU General Public License -along with this program; if not, write to the Free Software -Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. -@end smallexample - -Also add information on how to contact you by electronic and paper mail. - -If the program is interactive, make it output a short notice like this -when it starts in an interactive mode: - -@smallexample -Gnomovision version 69, Copyright (C) 19@var{yy} @var{name of author} -Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. -This is free software, and you are welcome to redistribute it -under certain conditions; type `show c' for details. -@end smallexample - -The hypothetical commands `show w' and `show c' should show the -appropriate parts of the General Public License. Of course, the -commands you use may be called something other than `show w' and `show -c'; they could even be mouse-clicks or menu items---whatever suits your -program. - -You should also get your employer (if you work as a programmer) or your -school, if any, to sign a ``copyright disclaimer'' for the program, if -necessary. Here a sample; alter the names: - -@example -Yoyodyne, Inc., hereby disclaims all copyright interest in the -program `Gnomovision' (a program to direct compilers to make passes -at assemblers) written by James Hacker. - -@var{signature of Ty Coon}, 1 April 1989 -Ty Coon, President of Vice -@end example - -That's all there is to it! - -@node User Interface, Files, License, Top -@chapter GDB Commands and Displays - -GDB is invoked with the shell command @samp{gdb}. Once started, it reads -commands from the terminal until you tell it to exit. - -A GDB command is a single line of input. There is no limit on how long -it can be. It starts with a command name, which is followed by arguments -whose meaning depends on the command name. For example, the command -@samp{step} accepts an argument which is the number of times to step, -as in @samp{step 5}. You can also use the @samp{step} command with -no arguments. Some command names do not allow any arguments. - -@cindex abbreviation -GDB command names may always be truncated if that abbreviation is -unambiguous. Other possible command abbreviations are listed in the -documentation of the individual commands. Sometimes even ambiguous -abbreviations are allowed; for example, @samp{s} is specially defined as -equivalent to @samp{step} even though there are other commands whose -names start with @samp{s}. - -@cindex repeating commands -A blank line as input to GDB means to repeat the previous command. -Certain commands will not repeat this way; these are commands for which -unintentional repetition might cause trouble and which you are unlikely -to want to repeat. Certain others (@samp{list} and @samp{x}) act -differently when repeated because that is more useful. - -@kindex # -@cindex comment -A line of input starting with @samp{#} is a comment; it does nothing. -This is useful mainly in command files (@xref{Command Files}). - -@cindex online documentation -@kindex help -@table @code -@item help -@itemx help @var{category} -@itemx help @var{command} -You can always ask GDB itself for information on its commands, using the -command @samp{help}. With a command name as argument, it will display a -paragraph on how to use the command. Used with no arguments, -@samp{help} displays a short list of named categories of commands; you -can then use @samp{help @var{category}} to list the individual commands -in a category. - -@kindex info version -@item info version -As GDB evolves, new commands are introduced, and old ones may wither -away. If multiple versions of GDB are in use at your site, it may -occasionally be useful to make sure what version of GDB you're running. -GDB announces its version whenever it starts up; but you can make it -repeat this information with the @samp{info version} command. -@end table - -@cindex prompt -GDB indicates its readiness to read a command by printing a string -called the @dfn{prompt}. This string is normally @samp{(gdb)}. You can -change the prompt string with the @samp{set prompt} command. For -instance, when debugging GDB with GDB, it is useful to change the prompt -in one of the GDBs so that you tell which one you are talking to. - -@table @code -@item set prompt @var{newprompt} -@kindex set prompt -Directs GDB to use @var{newprompt} as its prompt string henceforth. -@kindex show prompt -@item show prompt -Prints a line of the form: @samp{Gdb's prompt is: @var{your-prompt}} -@end table - -@cindex exiting GDB -@kindex quit -To exit GDB, use the @samp{quit} command (abbreviated @samp{q}), or type -an end-of-file character (usually @ctrl{d}). An interrupt (often -@ctrl{c}) will not exit from GDB, but rather will terminate the action -of any GDB command that is in progress and return to GDB command level. -It is safe to type the interrupt character at any time because GDB does -not allow it to take effect until a time when it is safe. - -@cindex readline -@cindex command line editing -@cindex history substitution -GDB reads its input commands via the @code{readline} interface. This -GNU library provides consistent behavior for programs which provide a -command line interface to the user. Advantages are @samp{emacs}-style -or @samp{vi}-style inline editing of commands, @samp{csh}-like history -substitution, and a storage and recall of command history across -debugging sessions. - -You may control the behavior of command line editing in GDB with the -command @samp{set}. You may check the status of any of these settings -with the command @samp{show}. - -@table @code -@kindex set editing -@cindex editing -@item set editing -@itemx set editing on -Enable command line editing (enabled by default). - -@item set editing off -Disable command line editing. - -@kindex show editing -@item show editing -Show whether command line editing is enabled. - -@cindex history file -@kindex set history file -@item set history file @var{filename} -Set the name of the GDB command history file to @samp{filename}. This is -the file from which GDB will read an initial command history -list or to which it will write this list when it exits. This list is -accessed through history expansion or through the history -command editing characters listed below. This file defaults to the -value of the environmental variable @code{GDBHISTFILE}, or to -@code{./.gdb_history} if this variable is not set. - -@cindex history write -@kindex set history write -@item set history write -@itemx set history write on -Make GDB record command history in a file, whose name may be specified with the -@samp{set history file} command. By default, this option is disabled. - -@item set history write off -Make GDB stop recording command history in a file. - -@cindex history size -@kindex set history size -@item set history size @var{size} -Set the number of commands which GDB will keep in its history list. -This defaults to the value of the environmental variable -@code{HISTSIZE}, or to 256 if this variable is not set. -@end table - -@cindex history expansion -History expansion assigns special meaning to the character @samp{!} -(@pxref{Event Designators}). Since @samp{!} is also the logical not -operator in C, history expansion is off by default. If you decide to -enable history expansion with the @samp{set history expansion on} -command, you may sometimes need to follow @samp{!} (when it is used as -logical not, in an expression) with a space or a tab to prevent it from -being expanded. The @code{readline} history facilities will not attempt -substitution on the strings @samp{!=} and @samp{!(}, even when history -expansion is enabled. - -The commands to control history expansion are: +The commands to control history expansion are: @table @code @@ -863,9 +660,8 @@ debug a core dump of a previous run, GDB must be told the file name of the core dump. @menu -* Arguments: File Arguments. Specifying files with arguments - (when you start GDB). -* Commands: File Commands. Specifying files with GDB commands. +* File Arguments:: Specifying Files with Arguments +* File Commands:: Specifying Files with Commands @end menu @node File Arguments, File Commands, Files, Files @@ -888,7 +684,7 @@ you plan to do is debug the program interactively.) @xref{Options}, for full information on options and arguments for invoking GDB. -@node File Commands,, File Arguments, Files +@node File Commands, , File Arguments, Files @section Specifying Files with Commands Usually you specify the files for GDB to work with by giving arguments when @@ -999,7 +795,7 @@ previous source line. Symbol number @var{n} contains a pointer into the string table which is larger than the size of the string table. GDB circumvents the problem by considering the symbol to have the name @code{foo}, which may cause -other problems if many symbols end up with this name. @index{foo} +other problems if many symbols end up with this name. @cindex{foo} @item unknown symbol type @code{0xNN} @@ -1155,7 +951,7 @@ option or use shorter file names. Alternatively, use a version of GNU @code{ar} dated more recently than August 1989. @end ignore -@node Targets, Running, Compilation, Top +@node Targets, Running, Compilation, Top @chapter Specifying a Debugging Target @cindex debugging target @kindex target @@ -1248,13 +1044,13 @@ symbols, GDB will discard its symbol table and re-read it from your program. In this process, it tries to retain your current breakpoints. @menu -* Arguments:: Specifying the arguments for your program. -* Environment:: Specifying the environment for your program. -* Working Directory:: Specifying the working directory for giving +* Arguments:: Specifying the arguments for your program. +* Environment:: Specifying the environment for your program. +* Working Directory:: Specifying the working directory for giving to your program when it is run. -* Input/Output:: Specifying the program's standard input and output. -* Attach:: Debugging a process started outside GDB. -* Kill Process:: Getting rid of the child process running your program. +* Input/Output:: Specifying the program's standard input and output. +* Attach:: Debugging a process started outside GDB. +* Kill Process:: Getting rid of the child process running your program. @end menu @node Arguments, Environment, Running, Running @@ -1448,7 +1244,7 @@ whether or not this happens by using the @samp{set caution} command The @samp{attach} command is also used to debug a remote machine via a serial connection. @xref{Remote}, for more info. -@node Kill Process,, Attach, Running +@node Kill Process, , Attach, Running @section Killing the Child Process @table @code @@ -1481,13 +1277,13 @@ that point; or so that if the program runs into trouble you can investigate and find out why. @menu -* Signals:: Fatal signals in your program just stop it; +* Signals:: Fatal signals in your program just stop it; then you can use GDB to see what is going on. -* Breakpoints:: Breakpoints let you stop your program when it +* Breakpoints:: Breakpoints let you stop your program when it reaches a specified point in the code. an expression changes. -* Continuing:: Resuming execution until the next signal or breakpoint. -* Stepping:: Stepping runs the program a short distance and +* Continuing:: Resuming execution until the next signal or breakpoint. +* Stepping:: Stepping runs the program a short distance and then stops it wherever it has come to. @end menu @@ -1574,7 +1370,7 @@ You can also use the @samp{signal} command to prevent the program from seeing a signal, or cause it to see a signal it normally would not see, or to give it any signal at any time. @xref{Signaling}. -@node Breakpoints, Watchpoints Continuing, Signals, Stopping +@node Breakpoints, Continuing, Signals, Stopping @section Breakpoints @cindex breakpoints @@ -1625,13 +1421,13 @@ releases of GDB will use such hardware if it is available. @end table @menu -* Set Breaks:: How to establish breakpoints. -* Exception Handling:: How GDB supports exception handling for C++. -* Delete Breaks:: How to remove breakpoints no longer needed. -* Disabling:: How to disable breakpoints (turn them off temporarily). -* Conditions:: Making extra conditions on whether to stop. -* Break Commands:: Commands to be executed at a breakpoint. -* Error in Breakpoints:: "Cannot insert breakpoints" error--why, what to do. +* Set Breaks:: How to establish breakpoints. +* Exception Handling:: How GDB supports exception handling for C++. +* Delete Breaks:: How to remove breakpoints no longer needed. +* Disabling:: How to disable breakpoints (turn them off temporarily). +* Conditions:: Making extra conditions on whether to stop. +* Break Commands:: Commands to be executed at a breakpoint. +* Error in Breakpoints:: @end menu @node Set Breaks, Exception Handling, Breakpoints, Breakpoints @@ -1780,7 +1576,7 @@ You cannot raise an exception interactively. You cannot interactively install an exception handler. @end itemize -@node Delete Breaks, Disabling, Set Breaks, Breakpoints +@node Delete Breaks, Disabling, Exception Handling, Breakpoints @subsection Deleting Breakpoints @cindex clearing breakpoints and watchpoints @@ -2078,7 +1874,7 @@ evaluated without changing the terminal modes. When you want to have nontrivial conditions for performing the side effects, the operators @samp{&&}, @samp{||} and @samp{?@dots{}:} may be useful. -@node Error in Breakpoints,, Break Commands, Breakpoints +@node Error in Breakpoints, , Break Commands, Breakpoints @subsection ``Cannot Insert Breakpoints'' Error Under some operating systems, breakpoints cannot be used in a program if @@ -2138,7 +1934,7 @@ you can continue with @samp{signal 0}. @xref{Signaling}. You can also act in advance to control what signals your program will see, using the @samp{handle} command (@pxref{Signals}). -@node Stepping,, Continuing, Stopping +@node Stepping, , Continuing, Stopping @section Stepping @cindex stepping @@ -2281,10 +2077,10 @@ frame and describes it briefly as the @samp{frame} command does (@pxref{Frame Info, Info}). @menu -* Frames:: Explanation of stack frames and terminology. -* Backtrace:: Summarizing many frames at once. -* Selection:: How to select a stack frame. -* Info: Frame Info, Commands to print information on stack frames. +* Frames:: Explanation of stack frames and terminology. +* Backtrace:: Summarizing many frames at once. +* Selection:: How to select a stack frame. +* Frame Info:: Information on a Frame @end menu @node Frames, Backtrace, Stack, Stack @@ -2453,7 +2249,7 @@ that source line. For example: After such a printout, the @samp{list} command with no arguments will print ten lines centered on the point of execution in the frame. @xref{List}. -@node Frame Info, , Selection, Stack +@node Frame Info, , Selection, Stack @section Information on a Frame There are several other commands to print information about the selected @@ -2516,9 +2312,9 @@ which execution in that frame has stopped in. You can also print parts of source files by explicit command. @menu -* List:: Using the @samp{list} command to print source files. -* Search:: Commands for searching source files. -* Source Path:: Specifying the directories to search for source files. +* List:: Using the @samp{list} command to print source files. +* Search:: Commands for searching source files. +* Source Path:: Specifying the directories to search for source files. @end menu @node List, Search, Source, Source @@ -2660,7 +2456,7 @@ with the one before the last line listed and going backward, for a match for @var{regexp}. It lists the line that is found. You can abbreviate this command with as little as @samp{rev}. -@node Source Path,, Search, Source +@node Source Path, , Search, Source @section Specifying Source Directories @cindex source path @@ -2746,17 +2542,15 @@ It examines data in memory at a specified address and prints it in a specified format. @menu -* Expressions:: Expressions that can be computed and printed. -* Variables:: Using your program's variables in expressions. -* Assignment:: Setting your program's variables. -* Arrays:: Examining part of memory as an array. -* Format Options:: Controlling how structures and arrays are printed. -* Output formats:: Specifying formats for printing values. -* Memory:: Examining memory explicitly. -* Auto Display:: Printing certain expressions whenever program stops. -* Value History:: Referring to values previously printed. -* Convenience Vars:: Giving names to values for future reference. -* Registers:: Referring to and storing in machine registers. +* Expressions:: Expressions that can be computed and printed. +* Variables:: Using your program's variables in expressions. +* Arrays:: Examining part of memory as an array. +* Format options:: Controlling how structures and arrays are printed. +* Output formats:: Specifying formats for printing values. +* Auto Display:: Printing certain expressions whenever program stops. +* Value History:: Referring to values previously printed. +* Convenience Vars:: Giving names to values for future reference. +* Registers:: Referring to and storing in machine registers. @end menu @node Expressions, Variables, Data, Data @@ -2982,10 +2776,10 @@ $1 = @{ @item set prettyprint off Cause GDB to print structures in a compact format, like this: -@example +@smallexample $1 = @{next = 0x0, flags = @{sweet = 1, sour = 1@}, meat \ = 0x54 "Pork"@} -@end example +@end smallexample @noindent This is the default format. @@ -3009,7 +2803,7 @@ structures. For example, given the declarations -@example +@smallexample typedef enum @{Tree, Bug@} Species; typedef enum @{Big_tree, Acorn, Seedling@} Tree_forms; typedef enum @{Caterpillar, Cocoon, Butterfly@} Bug_forms; @@ -3023,14 +2817,14 @@ struct thing @{ @}; struct thing foo = @{Tree, @{Acorn@}@}; -@end example +@end smallexample @noindent with @samp{set unionprint on} in effect @samp{p foo} would print -@example +@smallexample $1 = @{it = Tree, form = @{tree = Acorn, bug = Cocoon@}@} -@end example +@end smallexample @noindent and with @samp{set unionprint off} in effect it would print @@ -3040,7 +2834,7 @@ $1 = @{it = Tree, form = @{...@}@} @end example @end table -@node Output formats, Memory, Format options, Data +@node Output formats, Auto Display, Format options, Data @section Output formats @cindex formatted output @@ -3102,7 +2896,11 @@ To reprint the last value in the value history with a different format, you can use the @samp{print} command with just a format and no expression. For example, @samp{p/x} reprints the last value in hex. -@node Memory, Auto Display, Output formats, Data +@menu +* Memory:: Examining Memory +@end menu + +@node Memory, , Output formats, Output formats @subsection Examining Memory @cindex examining memory @@ -3256,7 +3054,7 @@ If the @samp{x} command has a repeat count, the address and contents saved are from the last memory unit printed; this is not the same as the last address printed if several units were printed on the last line of output. -@node Auto Display, Value History, Memory, Data +@node Auto Display, Value History, Output formats, Data @section Automatic Display @cindex automatic display @cindex display of expressions @@ -3469,7 +3267,7 @@ The variable @code{$__} is automatically set by the @samp{x} command to the value found in the last address examined. @end table -@node Registers,, Convenience Vars, Data +@node Registers, , Convenience Vars, Data @section Registers @cindex registers @@ -3663,11 +3461,11 @@ locations, give the program a signal, restart it at a different address, or even return prematurely from a function to its caller. @menu -* Assignment:: Altering variable values or memory contents. -* Jumping:: Altering control flow. -* Signaling:: Making signals happen in the program. -* Returning:: Making a function return prematurely. -* Calling:: Calling functions from your program +* Assignment:: Altering variable values or memory contents. +* Jumping:: Altering control flow. +* Signaling:: Making signals happen in the program. +* Returning:: Making a function return prematurely. +* Calling:: Calling functions from your program @end menu @node Assignment, Jumping, Altering, Altering @@ -3815,7 +3613,7 @@ returned. Contrast this with the @samp{finish} command (@pxref{Stepping}), which resumes execution until the selected stack frame returns @emph{naturally}. -@node Calling, , , Returning, Altering +@node Calling, , Returning, Altering @comment node-name, next, previous, up @section Calling your Program's Functions @@ -3840,9 +3638,9 @@ ways to store sequences of commands for execution as a unit: user-defined commands and command files. @menu -* Define:: User-defined commands. -* Command Files:: Command files. -* Output:: Controlled output commands useful in +* Define:: User-defined commands. +* Command Files:: Command files. +* Output:: Controlled output commands useful in user-defined commands and command files. @end menu @@ -3920,7 +3718,7 @@ without asking when used in a command file. Many GDB commands that normally print messages to say what they are doing omit the messages when used in a command file. -@node Output,, Command Files, Sequences +@node Output, , Command Files, Sequences @section Commands for Controlled Output During the execution of a command file or a user-defined command, the only @@ -4001,9 +3799,9 @@ When you invoke GDB, you can specify arguments telling it what files to operate on and what other things to do. @menu -* Mode Options:: Options controlling modes of operation. -* File Options:: Options to specify files (executable, coredump, commands) -* Other Arguments:: Any other arguments without options +* Mode Options:: Options controlling modes of operation. +* File Options:: Options to specify files (executable, coredump, commands) +* Other Arguments:: Any other arguments without options also specify files. @end menu @@ -4091,7 +3889,7 @@ Execute GDB commands from file @var{file}. Add @var{directory} to the path to search for source files. @end table -@node Other Arguments,, File Options, Options +@node Other Arguments, , File Options, Options @section Other Arguments If there are arguments to GDB that are not options or associated with @@ -4197,7 +3995,7 @@ environment. Users of this environment can use a new command, each value is printed in its own window. @end ignore -@node Remote, Commands, Emacs, Top +@node Remote, GDB Bugs, Emacs, Top @chapter Remote Debugging @cindex remote debugging @@ -4216,13 +4014,13 @@ Several sample remote debugging drivers are distributed with GDB; see the @file{README} file in the GDB distribution for more information. @menu -* Remote Commands:: Commands used to start and finish remote debugging. +* Remote Commands:: Commands used to start and finish remote debugging. @end menu For details of the communication protocol, see the comments in the GDB source file @file{remote.c}. -@node Remote Commands, GDB Bugs, Remote, Remote +@node Remote Commands, , Remote, Remote @section Commands for Remote Debugging To start remote debugging, first run GDB and specify as an executable file @@ -4235,316 +4033,613 @@ name as an argument. For example: target remote /dev/ttyd @end example -@noindent -if the serial line is connected to the device named @file{/dev/ttyd}. This -will stop the remote machine if it is not already stopped. +@noindent +if the serial line is connected to the device named @file{/dev/ttyd}. This +will stop the remote machine if it is not already stopped. + +Now you can use all the usual commands to examine and change data and to +step and continue the remote program. + +To resume the remote program and stop debugging it, use the @samp{detach} +command. + +@table @code +@item reset +@kindex reset +For a target attached through a serial line, this command sends a +``break'' to the remote target system; this is only useful if the target +has been equipped with a circuit to perform a hard reset (or some other +interesting action) when a break is detected. +@end table + +@node GDB Bugs, Installing GDB, Remote, Top +@comment node-name, next, previous, up +@chapter Reporting Bugs in GDB +@cindex Bugs in GDB +@cindex Reporting Bugs in GDB + +Your bug reports play an essential role in making GDB reliable. + +Reporting a bug may help you by bringing a solution to your problem, or it +may not. But in any case the important function of a bug report is to help +the entire community by making the next version of GDB work better. Bug +reports are your contribution to the maintenance of GDB. + +In order for a bug report to serve its purpose, you must include the +information that makes for fixing the bug. + +@menu +* Bug Criteria:: Have You Found a Bug? +* Bug Reporting:: How to Report Bugs +@end menu + +@node Bug Criteria, Bug Reporting, GDB Bugs, GDB Bugs +@section Have You Found a Bug? +@cindex Bug Criteria + +If you are not sure whether you have found a bug, here are some guidelines: + +@itemize @bullet +@item +@cindex Fatal Signal +@cindex Core Dump +If the debugger gets a fatal signal, for any input whatever, that is a +GDB bug. Reliable debuggers never crash. + +@item +@cindex error on Valid Input +If GDB produces an error message for valid input, that is a bug. + +@item +@cindex Invalid Input +If GDB does not produce an error message for invalid input, +that is a bug. However, you should note that your idea of +``invalid input'' might be our idea of ``an extension'' or ``support +for traditional practice''. + +@item +If you are an experienced user of debugging tools, your suggestions +for improvement of GDB are welcome in any case. +@end itemize + +@node Bug Reporting, , Bug Criteria, GDB Bugs +@section How to Report Bugs +@cindex Bug Reports +@cindex Compiler Bugs, Reporting + +@comment The following is meant to be neutral and helpful, not just a plug for +@comment Cygnus; feedback on the issue (to "pesch@cygnus.com" or +@comment "info@cygnus.com"---the latter will reach all of Cygnus) +@comment is welcome. +A number of companies and individuals offer support for GNU products. +If you obtained GDB from a support organization, we recommend you +contact that organization first. + +Among these organizations are Cygnus Support (Palo Alto CA, USA); C2V +(Paris, France); Dynamix Corporation (King of Prussia PA, USA); The Nice +Computer Company (Perth, Australia); Optimal Solutions (Seattle WA, +USA); and The Pharos Group (Las Cruces NM, USA). + +Full contact information is in the file @samp{etc/SERVICE} in the GNU +Emacs distribution. Numerous individual consultants are also listed +there. +@comment END NEUTRAL+HELPFUL section + +In any event, we also recommend that you send bug reports for GDB to one +of these addresses: + +@example +bug-gdb@@prep.ai.mit.edu +@{ucbvax|mit-eddie|uunet@}!prep.ai.mit.edu!bug-gdb +@end example + +@strong{Do not send bug reports to @samp{info-gdb}, or to +@samp{help-gdb}, or to any newsgroups.} Most users of GDB do not want to +receive bug reports. Those that do, have asked to be on @samp{bug-gdb}. + +The mailing list @samp{bug-gdb} has a newsgroup which serves as a +repeater. The mailing list and the newsgroup carry exactly the same +messages. Often people think of posting bug reports to the newsgroup +instead of mailing them. This appears to work, but it has one problem +which can be crucial: a newsgroup posting does not contain a mail path +back to the sender. Thus, if we need to ask for more information, we +may be unable to reach you. For this reason, it is better to send bug +reports to the mailing list. + +As a last resort, send bug reports on paper to: + +@example +GNU Debugger Bugs +545 Tech Sq +Cambridge, MA 02139 +@end example + +The fundamental principle of reporting bugs usefully is this: +@strong{report all the facts}. If you are not sure whether to state a +fact or leave it out, state it! + +Often people omit facts because they think they know what causes the +problem and they conclude that some details don't matter. Thus, you might +assume that the name of the variable you use in an example does not matter. +Well, probably it doesn't, but one cannot be sure. Perhaps the bug is a +stray memory reference which happens to fetch from the location where that +name is stored in memory; perhaps, if the name were different, the contents +of that location would fool the debugger into doing the right thing despite +the bug. Play it safe and give a specific, complete example. That is the +easiest thing for you to do, and the most helpful. + +Keep in mind that the purpose of a bug report is to enable us to fix +the bug if it is not known. It isn't very important what happens if +the bug is already known. Therefore, always write your bug reports on +the assumption that the bug is not known. + +Sometimes people give a few sketchy facts and ask, ``Does this ring a +bell?'' Those bug reports are useless, and we urge everyone to +@emph{refuse to respond to them} except to chide the sender to report +bugs properly. + +To enable us to fix the bug, you should include all these things: + +@itemize @bullet +@item +The version of GDB. GDB announces it on startup; you can also print it +at any time using @samp{info version}. + +Without this, we won't know whether there is any point in looking for +the bug in the current version of GDB. + +@item +A complete input script, and all necessary source files, that will +reproduce the bug. + +@item +What compiler (and its version) was used to compile GDB---e.g. +``GCC-1.37.1''. + +@item +What compiler (and its version) was used to compile GDB. + +@item +The command arguments you gave the compiler to compile that example and +observe the bug. For example, did you use @samp{-O}? To guarantee +you won't omit something important, list them all. + +If we were to try to guess the arguments, we would probably guess wrong +and then we would not encounter the bug. + +@item +The type of machine you are using, and the operating system name and +version number. + +@item +A description of what behavior you observe that you believe is +incorrect. For example, ``It gets a fatal signal.'' + +Of course, if the bug is that GDB gets a fatal signal, then we +will certainly notice it. But if the bug is incorrect output, we might +not notice unless it is glaringly wrong. + +Even if the problem you experience is a fatal signal, you should still +say so explicitly. Suppose something strange is going on, such as, +your copy of GDB is out of synch, or you have encountered a +bug in the C library on your system. (This has happened!) Your copy +might crash and ours would not. If you @i{told} us to expect a crash, +then when ours fails to crash, we would know that the bug was not +happening for us. If you had not told us to expect a crash, then we +would not be able to draw any conclusion from our observations. + +@item +If you wish to suggest changes to the GDB source, send us context +diffs. If you even discuss something in the GDB source, refer to +it by context, not by line number. + +The line numbers in our development sources don't match those in your +sources. Your line numbers would convey no useful information to us. + +@end itemize + +Here are some things that are not necessary: + +@itemize @bullet +@item +A description of the envelope of the bug. + +Often people who encounter a bug spend a lot of time investigating +which changes to the input file will make the bug go away and which +changes will not affect it. + +This is often time consuming and not very useful, because the way we +will find the bug is by running a single example under the debugger +with breakpoints, not by pure deduction from a series of examples. +We recommend that you save your time for something else. + +Of course, if you can find a simpler example to report @emph{instead} +of the original one, that is a convenience for us. Errors in the +output will be easier to spot, running under the debugger will take +less time, etc. + +However, simplification is not vital; if you don't want to do this, +report the bug anyway and send us the entire test case you used. + +@item +A patch for the bug. + +A patch for the bug does help us if it is a good one. But don't omit +the necessary information, such as the test case, on the assumption that +a patch is all we need. We might see problems with your patch and decide +to fix the problem another way, or we might not understand it at all. + +Sometimes with a program as complicated as GDB it is very hard to +construct an example that will make the program follow a certain path +through the code. If you don't send us the example, we won't be able +to construct one, so we won't be able to verify that the bug is fixed. + +And if we can't understand what bug you are trying to fix, or why your +patch should be an improvement, we won't install it. A test case will +help us to understand. -Now you can use all the usual commands to examine and change data and to -step and continue the remote program. +@item +A guess about what the bug is or what it depends on. -To resume the remote program and stop debugging it, use the @samp{detach} -command. +Such guesses are usually wrong. Even we can't guess right about such +things without first using the debugger to find the facts. +@end itemize -@table @code -@item reset -@kindex reset -For a target attached through a serial line, this command sends a -``break'' to the remote target system; this is only useful if the target -has been equipped with a circuit to perform a hard reset (or some other -interesting action) when a break is detected. -@end table +@iftex +@include readline/inc-readline.texinfo +@include readline/inc-history.texinfo +@end iftex -@node GDB Bugs, , Remote Commands, Top -@comment node-name, next, previous, up -@chapter Reporting Bugs in GDB -@cindex Bugs in GDB -@cindex Reporting Bugs in GDB +@node Installing GDB, License, GDB Bugs, Top +@appendix Installing GDB +@cindex configuring GDB +@cindex installation -Your bug reports play an essential role in making GDB reliable. +The script @samp{config.gdb} automates the process of preparing GDB for +installation; you can then use @samp{make} to actually build it. For +example, -Reporting a bug may help you by bringing a solution to your problem, or it -may not. But in any case the important function of a bug report is to help -the entire community by making the next version of GDB work better. Bug -reports are your contribution to the maintenance of GDB. +@example +config.gdb sun3os4 +make +@end example -In order for a bug report to serve its purpose, you must include the -information that makes for fixing the bug. +@noindent +is all that's required to install GDB on a Sun 3 running SunOS 4. -@menu -* Criteria: Bug Criteria. Have you really found a bug? -* Reporting: Bug Reporting. How to report a bug effectively. -* Known: Trouble. Known problems. -@end menu +@table @code +@kindex config.gdb +@item config.gdb @var{machine} +@itemx config.gdb +srcdir=@var{dir} @var{machine} +This is the most usual way of configuring GDB; to debug programs running +on the same machine as GDB itself. If you wish to build the GDB binaries +in a completely different directory from the sources, specify a path to +the source directory using the @samp{+srcdir} option. -@node Bug Criteria, Bug Reporting, Bugs, Bugs -@section Have You Found a Bug? -@cindex Bug Criteria +@item config.gdb +host +@cindex host environments +Display a list of supported host environments for GDB. -If you are not sure whether you have found a bug, here are some guidelines: +@item config.gdb @var{host} @var{target} +@itemx config.gdb +srcdir=@var{dir} @var{host} @var{target} +@cindex cross-debugging +GDB can also be used as a cross-debugger, running on a machine of one +type while debugging a program running on a machine of another type. +You configure it this way by specifying first the @var{host}, then the +@var{target} environment on the @code{config.gdb} argument list; the +@var{host} is where GDB runs, and the @var{target} is where your program +runs. @xref{Remote}. Again, you can use @samp{+srcdir} to specify a +path to the GDB source. -@itemize @bullet -@item -@cindex Fatal Signal -@cindex Core Dump -If the debugger gets a fatal signal, for any input whatever, that is a -GDB bug. Reliable debuggers never crash. +@item config.gdb +target +@cindex target environments +Display a list of supported target environments for GDB. +@end table -@item -@cindex error on Valid Input -If GDB produces an error message for valid input, that is a bug. +@node License, Commands, Installing GDB, Top +@unnumbered GNU GENERAL PUBLIC LICENSE +@center Version 1, February 1989 -@item -@cindex Invalid Input -If GDB does not produce an error message for invalid input, -that is a bug. However, you should note that your idea of -``invalid input'' might be our idea of ``an extension'' or ``support -for traditional practice''. +@display +Copyright @copyright{} 1989 Free Software Foundation, Inc. +675 Mass Ave, Cambridge, MA 02139, USA -@item -If you are an experienced user of debugging tools, your suggestions -for improvement of GDB are welcome in any case. -@end itemize +Everyone is permitted to copy and distribute verbatim copies +of this license document, but changing it is not allowed. +@end display -@node Bug Reporting,, Bug Criteria, Bugs -@section How to Report Bugs -@cindex Bug Reports -@cindex Compiler Bugs, Reporting +@unnumberedsec Preamble -@comment The following is meant to be neutral and helpful, not just a plug for -@comment Cygnus; feedback on the issue (to "pesch@cygnus.com" or -@comment "info@cygnus.com"---the latter will reach all of Cygnus) -@comment is welcome. -A number of companies and individuals offer support for GNU products. -If you obtained GDB from a support organization, we recommend you -contact that organization first. + The license agreements of most software companies try to keep users +at the mercy of those companies. By contrast, our General Public +License is intended to guarantee your freedom to share and change free +software---to make sure the software is free for all its users. The +General Public License applies to the Free Software Foundation's +software and to any other program whose authors commit to using it. +You can use it for your programs, too. -Among these organizations are Cygnus Support (Palo Alto CA, USA); C2V -(Paris, France); Dynamix Corporation (King of Prussia PA, USA); The Nice -Computer Company (Perth, Australia); Optimal Solutions (Seattle WA, -USA); and The Pharos Group (Las Cruces NM, USA). + When we speak of free software, we are referring to freedom, not +price. Specifically, the General Public License is designed to make +sure that you have the freedom to give away or sell copies of free +software, that you receive source code or can get it if you want it, +that you can change the software or use pieces of it in new free +programs; and that you know you can do these things. -Full contact information is in the file @samp{etc/SERVICE} in the GNU -Emacs distribution. Numerous individual consultants are also listed -there. -@comment END NEUTRAL+HELPFUL section + To protect your rights, we need to make restrictions that forbid +anyone to deny you these rights or to ask you to surrender the rights. +These restrictions translate to certain responsibilities for you if you +distribute copies of the software, or if you modify it. -In any event, we also recommend that you send bug reports for GDB to one -of these addresses: + For example, if you distribute copies of a such a program, whether +gratis or for a fee, you must give the recipients all the rights that +you have. You must make sure that they, too, receive or can get the +source code. And you must tell them their rights. -@example -bug-gdb@@prep.ai.mit.edu -@{ucbvax|mit-eddie|uunet@}!prep.ai.mit.edu!bug-gdb -@end example + We protect your rights with two steps: (1) copyright the software, and +(2) offer you this license which gives you legal permission to copy, +distribute and/or modify the software. -@strong{Do not send bug reports to @samp{info-gdb}, or to -@samp{help-gdb}, or to any newsgroups.} Most users of GDB do not want to -receive bug reports. Those that do, have asked to be on @samp{bug-gdb}. + Also, for each author's protection and ours, we want to make certain +that everyone understands that there is no warranty for this free +software. If the software is modified by someone else and passed on, we +want its recipients to know that what they have is not the original, so +that any problems introduced by others will not reflect on the original +authors' reputations. -The mailing list @samp{bug-gdb} has a newsgroup which serves as a -repeater. The mailing list and the newsgroup carry exactly the same -messages. Often people think of posting bug reports to the newsgroup -instead of mailing them. This appears to work, but it has one problem -which can be crucial: a newsgroup posting does not contain a mail path -back to the sender. Thus, if we need to ask for more information, we -may be unable to reach you. For this reason, it is better to send bug -reports to the mailing list. + The precise terms and conditions for copying, distribution and +modification follow. -As a last resort, send bug reports on paper to: +@iftex +@unnumberedsec TERMS AND CONDITIONS +@end iftex +@ifinfo +@center TERMS AND CONDITIONS +@end ifinfo -@example -GNU Debugger Bugs -545 Tech Sq -Cambridge, MA 02139 -@end example +@enumerate +@item +This License Agreement applies to any program or other work which +contains a notice placed by the copyright holder saying it may be +distributed under the terms of this General Public License. The +``Program'', below, refers to any such program or work, and a ``work based +on the Program'' means either the Program or any work containing the +Program or a portion of it, either verbatim or with modifications. Each +licensee is addressed as ``you''. -The fundamental principle of reporting bugs usefully is this: -@strong{report all the facts}. If you are not sure whether to state a -fact or leave it out, state it! +@item +You may copy and distribute verbatim copies of the Program's source +code as you receive it, in any medium, provided that you conspicuously and +appropriately publish on each copy an appropriate copyright notice and +disclaimer of warranty; keep intact all the notices that refer to this +General Public License and to the absence of any warranty; and give any +other recipients of the Program a copy of this General Public License +along with the Program. You may charge a fee for the physical act of +transferring a copy. -Often people omit facts because they think they know what causes the -problem and they conclude that some details don't matter. Thus, you might -assume that the name of the variable you use in an example does not matter. -Well, probably it doesn't, but one cannot be sure. Perhaps the bug is a -stray memory reference which happens to fetch from the location where that -name is stored in memory; perhaps, if the name were different, the contents -of that location would fool the debugger into doing the right thing despite -the bug. Play it safe and give a specific, complete example. That is the -easiest thing for you to do, and the most helpful. +@item +You may modify your copy or copies of the Program or any portion of +it, and copy and distribute such modifications under the terms of Paragraph +1 above, provided that you also do the following: -Keep in mind that the purpose of a bug report is to enable us to fix -the bug if it is not known. It isn't very important what happens if -the bug is already known. Therefore, always write your bug reports on -the assumption that the bug is not known. +@itemize @bullet +@item +cause the modified files to carry prominent notices stating that +you changed the files and the date of any change; and -Sometimes people give a few sketchy facts and ask, ``Does this ring a -bell?'' Those bug reports are useless, and we urge everyone to -@emph{refuse to respond to them} except to chide the sender to report -bugs properly. +@item +cause the whole of any work that you distribute or publish, that +in whole or in part contains the Program or any part thereof, either +with or without modifications, to be licensed at no charge to all +third parties under the terms of this General Public License (except +that you may choose to grant warranty protection to some or all +third parties, at your option). -To enable us to fix the bug, you should include all these things: +@item +If the modified program normally reads commands interactively when +run, you must cause it, when started running for such interactive use +in the simplest and most usual way, to print or display an +announcement including an appropriate copyright notice and a notice +that there is no warranty (or else, saying that you provide a +warranty) and that users may redistribute the program under these +conditions, and telling the user how to view a copy of this General +Public License. -@itemize @bullet @item -The version of GDB. GDB announces it on startup; you can also print it -at any time using @samp{info version}. +You may charge a fee for the physical act of transferring a +copy, and you may at your option offer warranty protection in +exchange for a fee. +@end itemize -Without this, we won't know whether there is any point in looking for -the bug in the current version of GDB. +Mere aggregation of another independent work with the Program (or its +derivative) on a volume of a storage or distribution medium does not bring +the other work under the scope of these terms. @item -A complete input script, and all necessary source files, that will -reproduce the bug. +You may copy and distribute the Program (or a portion or derivative of +it, under Paragraph 2) in object code or executable form under the terms of +Paragraphs 1 and 2 above provided that you also do one of the following: +@itemize @bullet @item -What compiler (and its version) was used to compile GDB---e.g. -``GCC-1.37.1''. +accompany it with the complete corresponding machine-readable +source code, which must be distributed under the terms of +Paragraphs 1 and 2 above; or, @item -What compiler (and its version) was used to compile GDB. +accompany it with a written offer, valid for at least three +years, to give any third party free (except for a nominal charge +for the cost of distribution) a complete machine-readable copy of the +corresponding source code, to be distributed under the terms of +Paragraphs 1 and 2 above; or, @item -The command arguments you gave the compiler to compile that example and -observe the bug. For example, did you use @samp{-O}? To guarantee -you won't omit something important, list them all. +accompany it with the information you received as to where the +corresponding source code may be obtained. (This alternative is +allowed only for noncommercial distribution and only if you +received the program in object code or executable form alone.) +@end itemize -If we were to try to guess the arguments, we would probably guess wrong -and then we would not encounter the bug. +Source code for a work means the preferred form of the work for making +modifications to it. For an executable file, complete source code means +all the source code for all modules it contains; but, as a special +exception, it need not include source code for modules which are standard +libraries that accompany the operating system on which the executable +file runs, or for standard header files or definitions files that +accompany that operating system. @item -The type of machine you are using, and the operating system name and -version number. +You may not copy, modify, sublicense, distribute or transfer the +Program except as expressly provided under this General Public License. +Any attempt otherwise to copy, modify, sublicense, distribute or transfer +the Program is void, and will automatically terminate your rights to use +the Program under this License. However, parties who have received +copies, or rights to use copies, from you under this General Public +License will not have their licenses terminated so long as such parties +remain in full compliance. @item -A description of what behavior you observe that you believe is -incorrect. For example, ``It gets a fatal signal.'' - -Of course, if the bug is that GDB gets a fatal signal, then we -will certainly notice it. But if the bug is incorrect output, we might -not notice unless it is glaringly wrong. - -Even if the problem you experience is a fatal signal, you should still -say so explicitly. Suppose something strange is going on, such as, -your copy of GDB is out of synch, or you have encountered a -bug in the C library on your system. (This has happened!) Your copy -might crash and ours would not. If you @i{told} us to expect a crash, -then when ours fails to crash, we would know that the bug was not -happening for us. If you had not told us to expect a crash, then we -would not be able to draw any conclusion from our observations. +By copying, distributing or modifying the Program (or any work based +on the Program) you indicate your acceptance of this license to do so, +and all its terms and conditions. @item -If you wish to suggest changes to the GDB source, send us context -diffs. If you even discuss something in the GDB source, refer to -it by context, not by line number. - -The line numbers in our development sources don't match those in your -sources. Your line numbers would convey no useful information to us. +Each time you redistribute the Program (or any work based on the +Program), the recipient automatically receives a license from the original +licensor to copy, distribute or modify the Program subject to these +terms and conditions. You may not impose any further restrictions on the +recipients' exercise of the rights granted herein. -@end itemize +@item +The Free Software Foundation may publish revised and/or new versions +of the General Public License from time to time. Such new versions will +be similar in spirit to the present version, but may differ in detail to +address new problems or concerns. -Here are some things that are not necessary: +Each version is given a distinguishing version number. If the Program +specifies a version number of the license which applies to it and ``any +later version'', you have the option of following the terms and conditions +either of that version or of any later version published by the Free +Software Foundation. If the Program does not specify a version number of +the license, you may choose any version ever published by the Free Software +Foundation. -@itemize @bullet @item -A description of the envelope of the bug. +If you wish to incorporate parts of the Program into other free +programs whose distribution conditions are different, write to the author +to ask for permission. For software which is copyrighted by the Free +Software Foundation, write to the Free Software Foundation; we sometimes +make exceptions for this. Our decision will be guided by the two goals +of preserving the free status of all derivatives of our free software and +of promoting the sharing and reuse of software generally. -Often people who encounter a bug spend a lot of time investigating -which changes to the input file will make the bug go away and which -changes will not affect it. +@iftex +@heading NO WARRANTY +@end iftex +@ifinfo +@center NO WARRANTY +@end ifinfo -This is often time consuming and not very useful, because the way we -will find the bug is by running a single example under the debugger -with breakpoints, not by pure deduction from a series of examples. -We recommend that you save your time for something else. +@item +BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY +FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN +OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES +PROVIDE THE PROGRAM ``AS IS'' WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED +OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF +MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS +TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE +PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, +REPAIR OR CORRECTION. -Of course, if you can find a simpler example to report @emph{instead} -of the original one, that is a convenience for us. Errors in the -output will be easier to spot, running under the debugger will take -less time, etc. +@item +IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL +ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR +REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, +INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES +ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT +LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES +SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE +WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN +ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. +@end enumerate -However, simplification is not vital; if you don't want to do this, -report the bug anyway and send us the entire test case you used. +@iftex +@heading END OF TERMS AND CONDITIONS +@end iftex +@ifinfo +@center END OF TERMS AND CONDITIONS +@end ifinfo -@item -A patch for the bug. +@page +@unnumberedsec How to Apply These Terms to Your New Programs -A patch for the bug does help us if it is a good one. But don't omit -the necessary information, such as the test case, on the assumption that -a patch is all we need. We might see problems with your patch and decide -to fix the problem another way, or we might not understand it at all. + If you develop a new program, and you want it to be of the greatest +possible use to humanity, the best way to achieve this is to make it +free software which everyone can redistribute and change under these +terms. -Sometimes with a program as complicated as GDB it is very hard to -construct an example that will make the program follow a certain path -through the code. If you don't send us the example, we won't be able -to construct one, so we won't be able to verify that the bug is fixed. + To do so, attach the following notices to the program. It is safest to +attach them to the start of each source file to most effectively convey +the exclusion of warranty; and each file should have at least the +``copyright'' line and a pointer to where the full notice is found. -And if we can't understand what bug you are trying to fix, or why your -patch should be an improvement, we won't install it. A test case will -help us to understand. +@smallexample +@var{one line to give the program's name and a brief idea of what it does.} +Copyright (C) 19@var{yy} @var{name of author} -@item -A guess about what the bug is or what it depends on. +This program is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 1, or (at your option) +any later version. -Such guesses are usually wrong. Even we can't guess right about such -things without first using the debugger to find the facts. -@end itemize +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. -@iftex -@include readline/inc-readline.texinfo -@include readline/inc-history.texinfo -@end iftex +You should have received a copy of the GNU General Public License +along with this program; if not, write to the Free Software +Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +@end smallexample -@node Installing GDB, , ,Top -@appendix Installing GDB -@cindex configuring GDB -@cindex installation +Also add information on how to contact you by electronic and paper mail. -The script @samp{config.gdb} automates the process of preparing GDB for -installation; you can then use @samp{make} to actually build it. For -example, +If the program is interactive, make it output a short notice like this +when it starts in an interactive mode: -@example -config.gdb sun3os4 -make -@end example +@smallexample +Gnomovision version 69, Copyright (C) 19@var{yy} @var{name of author} +Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. +This is free software, and you are welcome to redistribute it +under certain conditions; type `show c' for details. +@end smallexample -@noindent -is all that's required to install GDB on a Sun 3 running SunOS 4. +The hypothetical commands `show w' and `show c' should show the +appropriate parts of the General Public License. Of course, the +commands you use may be called something other than `show w' and `show +c'; they could even be mouse-clicks or menu items---whatever suits your +program. -@table @code -@kindex config.gdb -@item config.gdb @var{machine} -@itemx config.gdb +srcdir=@var{dir} @var{machine} -This is the most usual way of configuring GDB; to debug programs running -on the same machine as GDB itself. If you wish to build the GDB binaries -in a completely different directory from the sources, specify a path to -the source directory using the @samp{+srcdir} option. +You should also get your employer (if you work as a programmer) or your +school, if any, to sign a ``copyright disclaimer'' for the program, if +necessary. Here is a sample; alter the names: -@item config.gdb +host -@cindex host environments -Display a list of supported host environments for GDB. +@smallexample +Yoyodyne, Inc., hereby disclaims all copyright interest in the +program `Gnomovision' (a program to direct compilers to make passes +at assemblers) written by James Hacker. -@item config.gdb @var{host} @var{target} -@itemx config.gdb +srcdir=@var{dir} @var{host} @var{target} -@cindex cross-debugging -GDB can also be used as a cross-debugger, running on a machine of one -type while debugging a program running on a machine of another type. -You configure it this way by specifying first the @var{host}, then the -@var{target} environment on the @code{config.gdb} argument list; the -@var{host} is where GDB runs, and the @var{target} is where your program -runs. @xref{Remote}. Again, you can use @samp{+srcdir} to specify a -path to the GDB source. +@var{signature of Ty Coon}, 1 April 1989 +Ty Coon, President of Vice +@end smallexample -@item config.gdb +target -@cindex target environments -Display a list of supported target environments for GDB. -@end table +That's all there is to it! -@node Commands, Concepts, Remote, Top +@node Commands, Concepts, License, Top @unnumbered Command Index @printindex ky -@node Concepts, , Commands, Top +@node Concepts, , Commands, Top @unnumbered Index @printindex cp