support a similar function to export all symbols from a DLL or EXE; see
the description of @samp{--export-all-symbols} below.
+@kindex --export-dynamic-symbol=@var{glob}
+@cindex export dynamic symbol
+@item --export-dynamic-symbol=@var{glob}
+When creating a dynamically linked executable, symbols matching
+@var{glob} will be added to the dynamic symbol table. When creating a
+shared library, references to symbols matching @var{glob} will not be
+bound to the definitions within the shared library. This option is a
+no-op when creating a shared library and @samp{-Bsymbolic} or
+@samp{--dynamic-list} are not specified. This option is only meaningful
+on ELF platforms which support shared libraries.
+
+@kindex --export-dynamic-symbol-list=@var{file}
+@cindex export dynamic symbol list
+@item --export-dynamic-symbol-list=@var{file}
+Specify a @samp{--export-dynamic-symbol} for each pattern in the file.
+The format of the file is the same as the version node without
+scope and node name. See @ref{VERSION} for more information.
+
@ifclear SingleFormat
@cindex big-endian objects
@cindex endianness
option is not specified, the name @file{a.out} is used by default. The
script command @code{OUTPUT} can also specify the output file name.
+@kindex --dependency-file=@var{depfile}
+@cindex dependency file
+@item --dependency-file=@var{depfile}
+Write a @dfn{dependency file} to @var{depfile}. This file contains a rule
+suitable for @code{make} describing the output file and all the input files
+that were read to produce it. The output is similar to the compiler's
+output with @samp{-M -MP} (@pxref{Preprocessor Options,, Options
+Controlling the Preprocessor, gcc.info, Using the GNU Compiler
+Collection}). Note that there is no option like the compiler's @samp{-MM},
+to exclude ``system files'' (which is not a well-specified concept in the
+linker, unlike ``system headers'' in the compiler). So the output from
+@samp{--dependency-file} is always specific to the exact state of the
+installation where it was produced, and should not be copied into
+distributed makefiles without careful editing.
+
@kindex -O @var{level}
@cindex generating optimized output
@item -O @var{level}
Specifying zero will override any default non-zero sized
@code{PT_GNU_STACK} segment creation.
+@item start-stop-visibility=@var{value}
+@cindex visibility
+@cindex ELF symbol visibility
+Specify the ELF symbol visibility for synthesized
+@code{__start_SECNAME} and @code{__stop_SECNAME} symbols (@pxref{Input
+Section Example}). @var{value} must be exactly @samp{default},
+@samp{internal}, @samp{hidden}, or @samp{protected}. If no @samp{-z
+start-stop-visibility} option is given, @samp{protected} is used for
+compatibility with historical practice. However, it's highly
+recommended to use @samp{-z start-stop-visibility=hidden} in new
+programs and shared libraries so that these symbols are not exported
+between shared objects, which is not usually what's intended.
+
@item text
@itemx notext
@itemx textoff
-Report an error if DT_TEXTREL is set, i.e., if the binary has dynamic
-relocations in read-only sections. Don't report an error if
-@samp{notext} or @samp{textoff}.
+Report an error if DT_TEXTREL is set, i.e., if the position-independent
+or shared object has dynamic relocations in read-only sections. Don't
+report an error if @samp{notext} or @samp{textoff}.
@item undefs
Do not report unresolved symbol references from regular object files,
where this happens appear next. Finally any files that reference the
symbol are listed.
+@cindex ctf variables
+@kindex --ctf-variables
+@kindex --no-ctf-variables
+@item --ctf-variables
+@item --no-ctf-variables
+The CTF debuginfo format supports a section which encodes the names and
+types of variables found in the program which do not appear in any symbol
+table. These variables clearly cannot be looked up by address by
+conventional debuggers, so the space used for their types and names is
+usually wasted: the types are usually small but the names are often not.
+@option{--ctf-variables} causes the generation of such a section.
+The default behaviour can be restored with @option{--no-ctf-variables}.
+
+@cindex ctf type sharing
+@kindex --ctf-share-types
+@item --ctf-share-types=@var{method}
+Adjust the method used to share types between translation units in CTF.
+
+@table @samp
+@item share-unconflicted
+Put all types that do not have ambiguous definitions into the shared dictionary,
+where debuggers can easily access them, even if they only occur in one
+translation unit. This is the default.
+
+@item share-duplicated
+Put only types that occur in multiple translation units into the shared
+dictionary: types with only one definition go into per-translation-unit
+dictionaries. Types with ambiguous definitions in multiple translation units
+always go into per-translation-unit dictionaries. This tends to make the CTF
+larger, but may reduce the amount of CTF in the shared dictionary. For very
+large projects this may speed up opening the CTF and save memory in the CTF
+consumer at runtime.
+@end table
+
@cindex common allocation
@kindex --no-define-common
@item --no-define-common
@kindex -Map=@var{mapfile}
@item -Map=@var{mapfile}
Print a link map to the file @var{mapfile}. See the description of the
-@option{-M} option, above.
+@option{-M} option, above. Specifying a directory as @var{mapfile}
+causes the linker map to be written into a file inside the directory.
+The name of the file is based upon the @var{output} filename with
+@code{.map} appended.
@cindex memory usage
@kindex --no-keep-memory
@xref{PowerPC ELF32,,@command{ld} and PowerPC 32-bit ELF Support}.
@end ifset
-On some platforms the @samp{--relax} option performs target-specific,
+On some platforms the @option{--relax} option performs target specific,
global optimizations that become possible when the linker resolves
addressing in the program, such as relaxing address modes,
synthesizing new instructions, selecting shorter version of current
family of processors.
@end ifset
-@ifset GENERIC
-On platforms where this is not supported, @samp{--relax} is accepted,
-but ignored.
-@end ifset
-
-On platforms where @samp{--relax} is accepted the option
-@samp{--no-relax} can be used to disable the feature.
+On platforms where the feature is supported, the option
+@option{--no-relax} will disable it.
+On platforms where the feature is not supported, both @option{--relax}
+and @option{--no-relax} are accepted, but ignored.
+
@cindex retaining specified symbols
@cindex stripping all but some symbols
@cindex symbols, retaining selectively
is, if the @code{SECTIONS} command does not specify a start address for
the section (@pxref{SECTIONS}).
-@kindex --warn-shared-textrel
-@item --warn-shared-textrel
-Warn if the linker adds a DT_TEXTREL to a shared object.
+@kindex --warn-textrel
+@item --warn-textrel
+Warn if the linker adds DT_TEXTREL to a position-independent executable
+or shared object.
@kindex --warn-alternate-em
@item --warn-alternate-em
@kindex --high-entropy-va
@item --high-entropy-va
+@itemx --disable-high-entropy-va
Image is compatible with 64-bit address space layout randomization
-(ASLR).
+(ASLR). This option is enabled by default for 64-bit PE images.
+
This option also implies @option{--dynamicbase} and
@option{--enable-reloc-section}.
@kindex --dynamicbase
@item --dynamicbase
+@itemx --disable-dynamicbase
The image base address may be relocated using address space layout
randomization (ASLR). This feature was introduced with MS Windows
-Vista for i386 PE targets.
+Vista for i386 PE targets. This option is enabled by default but
+can be disabled via the @option{--disable-dynamicbase} option.
This option also implies @option{--enable-reloc-section}.
@kindex --forceinteg
@item --forceinteg
-Code integrity checks are enforced.
+@itemx --disable-forceinteg
+Code integrity checks are enforced. This option is disabled by
+default.
@kindex --nxcompat
@item --nxcompat
+@item --disable-nxcompat
The image is compatible with the Data Execution Prevention.
-This feature was introduced with MS Windows XP SP2 for i386 PE targets.
+This feature was introduced with MS Windows XP SP2 for i386 PE
+targets. The option is enabled by default.
@kindex --no-isolation
@item --no-isolation
+@itemx --disable-no-isolation
Although the image understands isolation, do not isolate the image.
+This option is disabled by default.
@kindex --no-seh
@item --no-seh
+@itemx --disable-no-seh
The image does not use SEH. No SE handler may be called from
-this image.
+this image. This option is disabled by default.
@kindex --no-bind
@item --no-bind
-Do not bind this image.
+@itemx --disable-no-bind
+Do not bind this image. This option is disabled by default.
@kindex --wdmdriver
@item --wdmdriver
-The driver uses the MS Windows Driver Model.
+@itemx --disable-wdmdriver
+The driver uses the MS Windows Driver Model. This option is disabled
+by default.
@kindex --tsaware
@item --tsaware
-The image is Terminal Server aware.
+@itemx --disable-tsaware
+The image is Terminal Server aware. This option is disabled by
+default.
@kindex --insert-timestamp
@item --insert-timestamp
@kindex --enable-reloc-section
@item --enable-reloc-section
+@itemx --disable-reloc-section
Create the base relocation table, which is necessary if the image
is loaded at a different image base than specified in the PE header.
+This option is enabled by default.
@end table
@c man end
code is used to insert TOC entries. Use this option to disable the
optimization.
+@cindex PowerPC64 inline PLT call optimization
+@kindex --no-inline-optimize
+@item --no-inline-optimize
+PowerPC64 @command{ld} normally replaces inline PLT call sequences
+marked with @code{R_PPC64_PLTSEQ}, @code{R_PPC64_PLTCALL},
+@code{R_PPC64_PLT16_HA} and @code{R_PPC64_PLT16_LO_DS} relocations by
+a number of @code{nop}s and a direct call when the function is defined
+locally and can't be overridden by some other definition. This option
+disables that optimization.
+
@cindex PowerPC64 multi-TOC
@kindex --no-multi-toc
@item --no-multi-toc
to become localentry:8. This will result in a dynamic loader
complaint and failure to run. The option is experimental, use with
care. @option{--no-plt-localentry} is the default.
+
+@cindex PowerPC64 Power10 stubs
+@kindex --power10-stubs
+@kindex --no-power10-stubs
+@item --power10-stubs
+@itemx --no-power10-stubs
+When PowerPC64 @command{ld} links input object files containing
+relocations used on power10 prefixed instructions it normally creates
+linkage stubs (PLT call and long branch) using power10 instructions
+for @code{@@notoc} PLT calls where @code{r2} is not known. The
+power10 notoc stubs are smaller and faster, so are preferred for
+power10. @option{--power10-stubs} and @option{--no-power10-stubs}
+allow you to override the linker's selection of stub instructions.
+@option{--power10-stubs=auto} allows the user to select the default
+auto mode.
@end table
@ifclear GENERIC
no-ops or widen density instructions to preserve branch target
alignment. There may still be some cases where no-ops are required to
preserve the correctness of the code.
+
+@item --abi-windowed
+@itemx --abi-call0
+Choose ABI for the output object and for the generated PLT code.
+PLT code inserted by the linker must match ABI of the output object
+because windowed and call0 ABI use incompatible function call
+conventions.
+Default ABI is chosen by the ABI tag in the @code{.xtensa.info} section
+of the first input object.
+A warning is issued if ABI tags of input objects do not match each other
+or the chosen output object ABI.
@end table
@ifclear GENERIC
projects / binutils-gdb.git / blobdiff