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| author | H.J. Lu <hjl.tools@gmail.com> | 2015-05-08 05:04:12 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2015-05-08 05:05:49 -0700 |
| commit | 573cc2e57db66165b390044338d3a4ad51f36bf8 (patch) | |
| tree | d504be11ff656471087dfa0e9eae6808c2b90b3d /gas/doc | |
| parent | 422349a385c2ccfc1e66f5c65560e5bd5fc97953 (diff) | |
| download | gdb-573cc2e57db66165b390044338d3a4ad51f36bf8.zip gdb-573cc2e57db66165b390044338d3a4ad51f36bf8.tar.gz gdb-573cc2e57db66165b390044338d3a4ad51f36bf8.tar.bz2 | |
Add -mno-shared to x86 assembler
On ELF target, the assembler normally generates code which can go into a
shared library where non-weak symbols can be preempted. The -mno-shared
option tells the assembler to generate code not for a shared library,
where non-weak symbols won't be preempted. The resulting code is slightly
smaller. This option mainly affects the handling of branch instructions.
gas/
* config/tc-i386.c (no_shared): New.
(OPTION_MNO_SHARED): Likewise.
(elf_symbol_resolved_in_segment_p): Check no_shared.
(md_longopts): Add mno-shared.
(md_parse_option): Handle OPTION_MNO_SHARED.
(md_show_usage): Add -mno-shared.
* doc/c-i386.texi: Document -mno-shared.
gas/testsuite/
* gas/i386/i386.exp: Run relax-4 and x86-64-relax-3.
* gas/i386/relax-4.d: New file.
* gas/i386/x86-64-relax-3.d: Likewise.
Diffstat (limited to 'gas/doc')
| -rw-r--r-- | gas/doc/c-i386.texi | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/gas/doc/c-i386.texi b/gas/doc/c-i386.texi index 7f0e79f..eb6790c 100644 --- a/gas/doc/c-i386.texi +++ b/gas/doc/c-i386.texi @@ -297,6 +297,16 @@ The @code{.att_syntax} and @code{.intel_syntax} directives will take precedent. This option forces the assembler to add BND prefix to all branches, even if such prefix was not explicitly specified in the source code. +@cindex @samp{-mno-shared} option, i386 +@cindex @samp{-mno-shared} option, x86-64 +@item -mno-shared +On ELF target, the assembler normally generates code which can go into a +shared library where non-weak symbols can be preempted. The +@samp{-mno-shared} option tells the assembler to generate code not for +a shared library, where non-weak symbols won't be preempted. The +resulting code is slightly smaller. This option mainly affects the +handling of branch instructions. + @cindex @samp{-mbig-obj} option, x86-64 @item -mbig-obj On x86-64 PE/COFF target this option forces the use of big object file |