From a1ab1d2aa3baf504c67892d1e46724f4a2c54ce5 Mon Sep 17 00:00:00 2001
From: Ulrich Drepper <drepper@redhat.com>
Date: Sat, 17 Mar 2001 21:24:26 +0000
Subject: [PATCH] 	* emultempl/elf32.em (OPTION_GROUP): New macro. 
 Add new option Bgroup to longopts. 	(gld*_parse_args): Handle GROUP_OPTION
 and recognize -z defs. 	(gld*_list_options): Add -Bgroup and -z defs. 
 * ld.1: Document -Bgroup and -z defs. 	* ld.texinfo: Likewise.

---
 ld/ChangeLog          |  9 ++++
 ld/emultempl/elf32.em | 13 ++++++
 ld/ld.1               | 14 ++++++
 ld/ld.texinfo         | 99 +++++++++++++++++++++++--------------------
 4 files changed, 90 insertions(+), 45 deletions(-)

diff --git a/ld/ChangeLog b/ld/ChangeLog
index 27552c9d562..9395dd68ca0 100644
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@@ -1,3 +1,12 @@
+2001-03-17  Ulrich Drepper  <drepper@redhat.com>
+
+	* emultempl/elf32.em (OPTION_GROUP): New macro.
+	Add new option Bgroup to longopts.
+	(gld*_parse_args): Handle GROUP_OPTION and recognize -z defs.
+	(gld*_list_options): Add -Bgroup and -z defs.
+	* ld.1: Document -Bgroup and -z defs.
+	* ld.texinfo: Likewise.
+
 2001-03-07  Michael Meissner  <meissner@redhat.com>
 
 	* scripttempl/elfd10v.sc (.rodata,.rodata1,.data1,.sdata): Deal
diff --git a/ld/emultempl/elf32.em b/ld/emultempl/elf32.em
index e890c75e896..d5b9eec8bd5 100644
--- a/ld/emultempl/elf32.em
+++ b/ld/emultempl/elf32.em
@@ -1334,6 +1334,7 @@ cat >>e${EMULATION_NAME}.c <<EOF
 
 #define OPTION_DISABLE_NEW_DTAGS	(400)
 #define OPTION_ENABLE_NEW_DTAGS		(OPTION_DISABLE_NEW_DTAGS + 1)
+#define OPTION_GROUP			(OPTION_ENABLE_NEW_DTAGS + 1)
 
 static struct option longopts[] =
 {
@@ -1347,6 +1348,8 @@ cat >>e${EMULATION_NAME}.c <<EOF
   {"disable-new-dtags", no_argument, NULL, OPTION_DISABLE_NEW_DTAGS},
   {"enable-new-dtags", no_argument, NULL, OPTION_ENABLE_NEW_DTAGS},
   {"enable-new-dtags", no_argument, NULL, OPTION_ENABLE_NEW_DTAGS},
+  {"Bgroup", no_argument, NULL, OPTION_GROUP},
+  {"Bgroup", no_argument, NULL, OPTION_GROUP},
 EOF
 fi
 
@@ -1405,6 +1408,12 @@ cat >>e${EMULATION_NAME}.c <<EOF
       link_info.new_dtags = true;
       break;
 
+    case OPTION_GROUP:
+      link_info.flags_1 |= (bfd_vma) DF_1_GROUP;
+      /* Groups must be self-contained.  */
+      link_info.no_undefined = true;
+      break;
+
     case 'z':
       if (strcmp (optarg, "initfirst") == 0)
 	link_info.flags_1 |= (bfd_vma) DF_1_INITFIRST;
@@ -1430,6 +1439,8 @@ cat >>e${EMULATION_NAME}.c <<EOF
 	  link_info.flags |= (bfd_vma) DF_ORIGIN;
 	  link_info.flags_1 |= (bfd_vma) DF_1_ORIGIN;
 	}
+      else if (strcmp (optarg, "defs") == 0)
+	link_info.no_undefined = true;
       /* What about the other Solaris -z options? FIXME.  */
       break;
 EOF
@@ -1463,8 +1474,10 @@ EOF
 
 if test x"$GENERATE_SHLIB_SCRIPT" = xyes; then
 cat >>e${EMULATION_NAME}.c <<EOF
+  fprintf (file, _("  -Bgroup\t\tSelects group name lookup rules for DSO\n"));
   fprintf (file, _("  --disable-new-dtags\tDisable new dynamic tags\n"));
   fprintf (file, _("  --enable-new-dtags\tEnable new dynamic tags\n"));
+  fprintf (file, _("  -z defs\t\tDisallows undefined symbols\n"));
   fprintf (file, _("  -z initfirst\t\tMark DSO to be initialized first at runtime\n"));
   fprintf (file, _("  -z interpose\t\tMark object to interpose all DSOs but executable\n"));
   fprintf (file, _("  -z loadfltr\t\tMark object requiring immediate process\n"));
diff --git a/ld/ld.1 b/ld/ld.1
index 2f941290e3e..1cfbbba118e 100644
--- a/ld/ld.1
+++ b/ld/ld.1
@@ -29,6 +29,7 @@ ld \- the GNU linker
 .I input-format\c
 \&\|] 
 .RB "[\|" \-Bstatic "\|]"  
+.RB "[\|" \-Bgroup "\|]"  
 .RB "[\|" \-Bdynamic "\|]"  
 .RB "[\|" \-Bsymbolic "\|]"  
 .RB "[\|" "\-c\ "\c
@@ -406,6 +407,19 @@ Link against dynamic libraries.  This is only meaningful on platforms
 for which shared libraries are supported.  This option is normally the
 default on such platforms.
 
+.TP
+.B \-Bgroup
+Set the \c
+.B DF_1_GROUP
+\c
+flag in the \c
+.B DT_FLAGS_1
+\c
+entry in the dynamic section.  This causes the runtime linker to handle
+lookups in this object and its dependencies to be performed only inside
+the group.  No undefined symbols are allowed.  This option is only
+meaningful on ELF platforms which support shared libraries.
+
 .TP
 .B \-Bsymbolic
 When creating a shared library, bind references to global symbols to
diff --git a/ld/ld.texinfo b/ld/ld.texinfo
index 4f87369f325..552d4aa9a46 100644
--- a/ld/ld.texinfo
+++ b/ld/ld.texinfo
@@ -301,7 +301,7 @@ You may want to use this option if you are linking files with an unusual
 binary format.  You can also use @samp{-b} to switch formats explicitly (when
 linking object files of different formats), by including
 @samp{-b @var{input-format}} before each group of object files in a
-particular format.  
+particular format.
 
 The default format is taken from the environment variable
 @code{GNUTARGET}.
@@ -329,7 +329,7 @@ specified by any @samp{-L} options.
 @kindex -d
 @kindex -dc
 @kindex -dp
-@item -d 
+@item -d
 @itemx -dc
 @itemx -dp
 These three options are equivalent; multiple forms are supported for
@@ -341,7 +341,7 @@ script command @code{FORCE_COMMON_ALLOCATION} has the same effect.
 @cindex entry point, from command line
 @kindex -e @var{entry}
 @kindex --entry=@var{entry}
-@item -e @var{entry} 
+@item -e @var{entry}
 @itemx --entry=@var{entry}
 Use @var{entry} as the explicit symbol for beginning execution of your
 program, rather than the default entry point.  If there is no symbol
@@ -511,7 +511,7 @@ behaviour of the AIX linker.
 @cindex search directory, from cmd line
 @kindex -L@var{dir}
 @kindex --library-path=@var{dir}
-@item -L@var{searchdir} 
+@item -L@var{searchdir}
 @itemx --library-path=@var{searchdir}
 Add path @var{searchdir} to the list of paths that @code{ld} will search
 for archive libraries and @code{ld} control scripts.  You may use this
@@ -568,13 +568,13 @@ which caused the archive member to be brought in.
 @item -n
 @itemx --nmagic
 Turn off page alignment of sections, and mark the output as
-@code{NMAGIC} if possible. 
+@code{NMAGIC} if possible.
 
 @kindex -N
 @kindex --omagic
 @cindex read/write from cmd line
 @cindex OMAGIC
-@item -N 
+@item -N
 @itemx --omagic
 Set the text and data sections to be readable and writable.  Also, do
 not page-align the data segment.  If the output format supports Unix
@@ -617,7 +617,7 @@ turn serve as input to @code{ld}.  This is often called @dfn{partial
 linking}.  As a side effect, in environments that support standard Unix
 magic numbers, this option also sets the output file's magic number to
 @code{OMAGIC}.
-@c ; see @code{-N}. 
+@c ; see @code{-N}.
 If this option is not specified, an absolute file is produced.  When
 linking C++ programs, this option @emph{will not} resolve references to
 constructors; to do that, use @samp{-Ur}.
@@ -641,21 +641,21 @@ the @code{-rpath} option.
 @kindex -s
 @kindex --strip-all
 @cindex strip all symbols
-@item -s 
+@item -s
 @itemx --strip-all
 Omit all symbol information from the output file.
 
 @kindex -S
 @kindex --strip-debug
 @cindex strip debugger symbols
-@item -S 
+@item -S
 @itemx --strip-debug
 Omit debugger symbol information (but not all symbols) from the output file.
 
 @kindex -t
 @kindex --trace
 @cindex input files, displaying
-@item -t 
+@item -t
 @itemx --trace
 Print the names of the input files as @code{ld} processes them.
 
@@ -687,7 +687,7 @@ option is equivalent to the @code{EXTERN} linker script command.
 
 @kindex -Ur
 @cindex constructors
-@item -Ur 
+@item -Ur
 For anything other than C++ programs, this option is equivalent to
 @samp{-r}: it generates relocatable output---i.e., an output file that can in
 turn serve as input to @code{ld}.  When linking C++ programs, @samp{-Ur}
@@ -728,7 +728,7 @@ Delete all local symbols.
 @kindex --discard-locals
 @cindex local symbols, deleting
 @cindex L, deleting symbols beginning
-@item -X 
+@item -X
 @itemx --discard-locals
 Delete all temporary local symbols.  For most targets, this is all local
 symbols whose names begin with @samp{L}.
@@ -767,6 +767,7 @@ of this object will ignore any default library search paths.
 @code{nodump} marks the object can not be dumped by @code{dldump}.
 @code{now} marks the object with the non-lazy runtime binding.
 @code{origin} marks the object may contain $ORIGIN.
+@code{defs} disallows undefined symbols.
 
 @kindex -(
 @cindex groups of archives
@@ -805,11 +806,19 @@ for compatibility with various systems.  You may use this option
 multiple times on the command line: it affects library searching for
 @code{-l} options which follow it.
 
+@kindex -Bgroup
+@item -Bgroup
+Set the @code{DF_1_GROUP} flag in the @code{DT_FLAGS_1} entry in the dynamic
+section.  This causes the runtime linker to handle lookups in this
+object and its dependencies to be performed only inside the group.
+@code{--no-undefined} is implied.  This option is only meaningful on ELF
+platforms which support shared libraries.
+
 @kindex -Bstatic
 @kindex -dn
 @kindex -non_shared
 @kindex -static
-@item -Bstatic 
+@item -Bstatic
 @itemx -dn
 @itemx -non_shared
 @itemx -static
@@ -875,9 +884,9 @@ These options control whether to demangle symbol names in error messages
 and other output.  When the linker is told to demangle, it tries to
 present symbol names in a readable fashion: it strips leading
 underscores if they are used by the object file format, and converts C++
-mangled symbol names into user readable names.  Different compilers have 
-different mangling styles.  The optional demangling style argument can be used 
-to choose an appropriate demangling style for your compiler.  The linker will 
+mangled symbol names into user readable names.  Different compilers have
+different mangling styles.  The optional demangling style argument can be used
+to choose an appropriate demangling style for your compiler.  The linker will
 demangle by default unless the environment variable @samp{COLLECT_NO_DEMANGLE}
 is set.  These options may be used to override the default.
 
@@ -945,9 +954,11 @@ necessary.  This may be required if @code{ld} runs out of memory space
 while linking a large executable.
 
 @kindex --no-undefined
+@kindex -z defs
 @item --no-undefined
+@itemx -z defs
 Normally when creating a non-symbolic shared library, undefined symbols
-are allowed and left to be resolved by the runtime loader.  This option
+are allowed and left to be resolved by the runtime loader.  These options
 disallows such undefined symbols.
 
 @kindex --allow-shlib-undefined
@@ -1014,7 +1025,7 @@ This option is ignored for SVR4 compatibility.
 @cindex synthesizing linker
 @cindex relaxing addressing modes
 @item --relax
-An option with machine dependent effects.  
+An option with machine dependent effects.
 @ifset GENERIC
 This option is only supported on a few targets.
 @end ifset
@@ -1849,15 +1860,15 @@ There are several ways to set the entry point.  The linker will set the
 entry point by trying each of the following methods in order, and
 stopping when one of them succeeds:
 @itemize @bullet
-@item 
+@item
 the @samp{-e} @var{entry} command-line option;
-@item 
+@item
 the @code{ENTRY(@var{symbol})} command in a linker script;
-@item 
+@item
 the value of the symbol @code{start}, if defined;
-@item 
+@item
 the address of the first byte of the @samp{.text} section, if present;
-@item 
+@item
 The address @code{0}.
 @end itemize
 
@@ -2216,7 +2227,7 @@ in the first input file.  The first section will be at address zero.
 @subsection Output section description
 The full description of an output section looks like this:
 @smallexample
-@group 
+@group
 @var{section} [@var{address}] [(@var{type})] : [AT(@var{lma})]
   @{
     @var{output-section-command}
@@ -2507,7 +2518,7 @@ notation is now considered obsolete.  It is equivalent to
 @cindex KEEP
 @cindex garbage collection
 When link-time garbage collection is in use (@samp{--gc-sections}),
-it is often useful to mark sections that should not be eliminated. 
+it is often useful to mark sections that should not be eliminated.
 This is accomplished by surrounding an input section's wildcard entry
 with @code{KEEP()}, as in @code{KEEP(*(.init))} or
 @code{KEEP(SORT(*)(.ctors))}.
@@ -2544,7 +2555,7 @@ SECTIONS @{
     @}
 @}
 @end group
-@end smallexample        
+@end smallexample
 
 @node Output Section Data
 @subsection Output section data
@@ -2731,7 +2742,7 @@ section named @samp{/DISCARD/} are not included in the output file.
 We showed above that the full description of an output section looked
 like this:
 @smallexample
-@group 
+@group
 @var{section} [@var{address}] [(@var{type})] : [AT(@var{lma})]
   @{
     @var{output-section-command}
@@ -2744,7 +2755,7 @@ We've already described @var{section}, @var{address}, and
 @var{output-section-command}.  In this section we will describe the
 remaining section attributes.
 
-@menu 
+@menu
 * Output Section Type::		Output section type
 * Output Section LMA::		Output section LMA
 * Output Section Region::	Output section region
@@ -2822,7 +2833,7 @@ counter holds the VMA value, not the LMA value.
 SECTIONS
   @{
   .text 0x1000 : @{ *(.text) _etext = . ; @}
-  .mdata 0x2000 : 
+  .mdata 0x2000 :
     AT ( ADDR (.text) + SIZEOF (.text) )
     @{ _data = . ; *(.data); _edata = . ;  @}
   .bss 0x3000 :
@@ -3049,7 +3060,7 @@ command.  However, you can define as many blocks of memory within it as
 you wish.  The syntax is:
 @smallexample
 @group
-MEMORY 
+MEMORY
   @{
     @var{name} [(@var{attr})] : ORIGIN = @var{origin}, LENGTH = @var{len}
     @dots{}
@@ -3124,7 +3135,7 @@ region.
 
 @smallexample
 @group
-MEMORY 
+MEMORY
   @{
     rom (rx)  : ORIGIN = 0, LENGTH = 256K
     ram (!rx) : org = 0x40000000, l = 4M
@@ -3328,9 +3339,9 @@ VERS_1.1 @{
 	 global:
 		 foo1;
 	 local:
-		 old*; 
-		 original*; 
-		 new*; 
+		 old*;
+		 original*;
+		 new*;
 @};
 
 VERS_1.2 @{
@@ -3612,7 +3623,7 @@ precedence      associativity   Operators                Notes
 (lowest)
 @end smallexample
 Notes:
-(1) Prefix operators 
+(1) Prefix operators
 (2) @xref{Assignments}.
 @c TEXI2ROFF-KILL
 @end ifinfo
@@ -3630,7 +3641,7 @@ height2pt&\omit&&\omit&&\omit&\cr
 height2pt&\omit&&\omit&&\omit&\cr
 &highest&&&&&\cr
 % '176 is tilde, '~' in tt font
-&1&&left&&\qquad-          \char'176\      !\qquad\dag&\cr 
+&1&&left&&\qquad-          \char'176\      !\qquad\dag&\cr
 &2&&left&&*          /        \%&\cr
 &3&&left&&+          -&\cr
 &4&&left&&>>         <<&\cr
@@ -3685,7 +3696,7 @@ following
 @group
 SECTIONS
   @{
-    .text 9+this_isnt_constant : 
+    .text 9+this_isnt_constant :
       @{ *(.text) @}
   @}
 @end group
@@ -3760,7 +3771,7 @@ identical values:
 @group
 SECTIONS @{ @dots{}
   .output1 :
-    @{ 
+    @{
     start_of_output_1 = ABSOLUTE(.);
     @dots{}
     @}
@@ -4073,7 +4084,7 @@ non-interworking aware Thumb code.
 @cindex entry point, thumb
 @kindex --thumb-entry=@var{entry}
 The @samp{--thumb-entry} switch is a duplicate of the generic
-@samp{--entry} switch, in that it sets the program's starting address.  
+@samp{--entry} switch, in that it sets the program's starting address.
 But it also sets the bottom bit of the address, so that it can be
 branched to using a BX instruction, and the program will start
 executing in Thumb mode straight away.
@@ -4451,10 +4462,10 @@ This command does nothing whatever; it's only accepted for compatibility.
 @cindex @code{FORMAT} (MRI)
 @item FORMAT @var{output-format}
 Similar to the @code{OUTPUT_FORMAT} command in the more general linker
-language, but restricted to one of these output formats: 
+language, but restricted to one of these output formats:
 
 @enumerate
-@item 
+@item
 S-records, if @var{output-format} is @samp{S}
 
 @item
@@ -4517,12 +4528,12 @@ If you have more than one @code{SECT} statement for the same
 @cindex GNU Free Documentation License
 
                 GNU Free Documentation License
-                
+
                    Version 1.1, March 2000
 
  Copyright (C) 2000  Free Software Foundation, Inc.
   59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
-     
+
  Everyone is permitted to copy and distribute verbatim copies
  of this license document, but changing it is not allowed.
 
@@ -4899,5 +4910,3 @@ to permit their use in free software.
 
 @contents
 @bye
-
-
-- 
2.30.2