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Support GCC LTO on GNU/Linux.

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* libltdl/config/ltmain.m4sh (func_mode_link): Allow through
flags matching -O*, -flto*, -fwhopr, -fuse-linker-plugin.
* libltdl/m4/libtool.m4 (_LT_CMD_GLOBAL_SYMBOLS): Drop symbols
starting with __gnu_lto.
(_LT_LINKER_SHLIBS) [linux] <archive_cmds, archive_expsyms_cmds>:
Add $pic_flag for GCC.
(_LT_LANG_CXX_CONFIG) [linux] <archive_cmds, archive_expsyms_cmds>:
Likewise.
(_LT_SYS_HIDDEN_LIBDEPS): Ignore files matching *.lto.o.
* NEWS: Update.

Signed-off-by: Ralf Wildenhues <Ralf.Wildenhues@gmx.de>
This commit is contained in:
Ralf Wildenhues 2010-08-29 17:31:29 +02:00
parent ada610770b
commit b81fd4ef00
4 changed files with 21 additions and 4 deletions
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12
ChangeLog
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@ -1,5 +1,17 @@
2010-08-29 Ralf Wildenhues <Ralf.Wildenhues@gmx.de>
Support GCC LTO on GNU/Linux.
* libltdl/config/ltmain.m4sh (func_mode_link): Allow through
flags matching -O*, -flto*, -fwhopr, -fuse-linker-plugin.
* libltdl/m4/libtool.m4 (_LT_CMD_GLOBAL_SYMBOLS): Drop symbols
starting with __gnu_lto.
(_LT_LINKER_SHLIBS) [linux] <archive_cmds, archive_expsyms_cmds>:
Add $pic_flag for GCC.
(_LT_LANG_CXX_CONFIG) [linux] <archive_cmds, archive_expsyms_cmds>:
Likewise.
(_LT_SYS_HIDDEN_LIBDEPS): Ignore files matching *.lto.o.
* NEWS: Update.
Disable GCC LTO for verbose library extraction.
* libltdl/m4/libtool.m4 (_LT_SYS_HIDDEN_LIBDEPS): Temporarily
append -fno-lto or -fno-whopr to CFLAGS if CC or CFLAGS (which

1
NEWS
View File

@ -97,6 +97,7 @@ New in 2.2.7b 2010-05-20: git version 2.2.7a, Libtool team:
- With binutils 2.19.50+, shared libraries can be built on AIX.
- Initial support for the Cuda Compiler Driver on GNU/Linux.
- Support for Haiku (i586-pc-haiku).
- Initial support for GCC link-time optimization (LTO) flags.
* Bug fixes:

4
libltdl/config/ltmain.m4sh
View File

@ -5015,8 +5015,10 @@ func_mode_link ()
# @file GCC response files
# -tp=* Portland pgcc target processor selection
# --sysroot=* for sysroot support
# -O*, -flto*, -fwhopr, -fuse-linker-plugin GCC link-time optimization
-64|-mips[0-9]|-r[0-9][0-9]*|-xarch=*|-xtarget=*|+DA*|+DD*|-q*|-m*| \
-t[45]*|-txscale*|-p|-pg|--coverage|-fprofile-*|-F*|@*|-tp=*|--sysroot=*)
-t[45]*|-txscale*|-p|-pg|--coverage|-fprofile-*|-F*|@*|-tp=*|--sysroot=*| \
-O*|-flto*|-fwhopr|-fuse-linker-plugin)
func_quote_for_eval "$arg"
arg="$func_quote_for_eval_result"
func_append compile_command " $arg"

8
libltdl/m4/libtool.m4 vendored
View File

@ -3615,6 +3615,7 @@ for ac_symprfx in "" "_"; do
else
lt_cv_sys_global_symbol_pipe="sed -n -e 's/^.*[[ ]]\($symcode$symcode*\)[[ ]][[ ]]*$ac_symprfx$sympat$opt_cr$/$symxfrm/p'"
fi
lt_cv_sys_global_symbol_pipe="$lt_cv_sys_global_symbol_pipe | sed '/ __gnu_lto/d'"
# Check to see that the pipe works correctly.
pipe_works=no
@ -4664,7 +4665,7 @@ _LT_EOF
if $LD --help 2>&1 | $EGREP ': supported targets:.* elf' > /dev/null \
&& test "$tmp_diet" = no
then
tmp_addflag=
tmp_addflag=' $pic_flag'
tmp_sharedflag='-shared'
case $cc_basename,$host_cpu in
pgcc*) # Portland Group C compiler
@ -5788,8 +5789,8 @@ if test "$_lt_caught_CXX_error" != yes; then
# Check if GNU C++ uses GNU ld as the underlying linker, since the
# archiving commands below assume that GNU ld is being used.
if test "$with_gnu_ld" = yes; then
_LT_TAGVAR(archive_cmds, $1)='$CC -shared -nostdlib $predep_objects $libobjs $deplibs $postdep_objects $compiler_flags ${wl}-soname $wl$soname -o $lib'
_LT_TAGVAR(archive_expsym_cmds, $1)='$CC -shared -nostdlib $predep_objects $libobjs $deplibs $postdep_objects $compiler_flags ${wl}-soname $wl$soname ${wl}-retain-symbols-file $wl$export_symbols -o $lib'
_LT_TAGVAR(archive_cmds, $1)='$CC $pic_flag -shared -nostdlib $predep_objects $libobjs $deplibs $postdep_objects $compiler_flags ${wl}-soname $wl$soname -o $lib'
_LT_TAGVAR(archive_expsym_cmds, $1)='$CC $pic_flag -shared -nostdlib $predep_objects $libobjs $deplibs $postdep_objects $compiler_flags ${wl}-soname $wl$soname ${wl}-retain-symbols-file $wl$export_symbols -o $lib'
_LT_TAGVAR(hardcode_libdir_flag_spec, $1)='${wl}-rpath ${wl}$libdir'
_LT_TAGVAR(export_dynamic_flag_spec, $1)='${wl}--export-dynamic'
@ -6897,6 +6898,7 @@ if AC_TRY_EVAL(ac_compile); then
prev=
;;
*.lto.$objext) ;; # Ignore GCC LTO objects
*.$objext)
# This assumes that the test object file only shows up
# once in the compiler output.