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[PATCH 1/4] Support GCC LTO on GNU/Linux.
From: |
Ralf Wildenhues |
Subject: |
[PATCH 1/4] Support GCC LTO on GNU/Linux. |
Date: |
Sun, 4 Apr 2010 10:55:49 +0200 |
User-agent: |
Mutt/1.5.20 (2009-10-28) |
* NEWS: Update.
* 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.
<output_verbose_link_cmd>: Only list lines starting with a space
and containing 'collect'.
(_LT_SYS_HIDDEN_LIBDEPS): Ignore files matching *.lto.o.
Suggested by Török Edwin and Simon Richter.
Signed-off-by: Ralf Wildenhues <address@hidden>
---
This patch still needs output_verbose_link_cmd to be fixed wrt.
http://thread.gmane.org/gmane.comp.gcc.devel/112719
and probably tested to work with icpc (which likes to pretend it's GCC).
The propagation of -O* for non-GCC compilers has not been tested yet.
Cheers,
Ralf
ChangeLog | 15 +++++++++++++++
NEWS | 1 +
libltdl/config/ltmain.m4sh | 4 +++-
libltdl/m4/libtool.m4 | 10 ++++++----
4 files changed, 25 insertions(+), 5 deletions(-)
diff --git a/ChangeLog b/ChangeLog
index 4e274ea..b324240 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,20 @@
2010-04-04 Ralf Wildenhues <address@hidden>
+ Support GCC LTO on GNU/Linux.
+ * NEWS: Update.
+ * 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.
+ <output_verbose_link_cmd>: Only list lines starting with a space
+ and containing 'collect'.
+ (_LT_SYS_HIDDEN_LIBDEPS): Ignore files matching *.lto.o.
+ Suggested by Török Edwin and Simon Richter.
+
Use linker_flags not compiler_flags with $LD.
* libltdl/m4/libtool.m4 (_LT_LINKER_SHLIBS) [linux]
<archive_cmds, archive_expsym_cmds>: With xlf and bgxlf
diff --git a/NEWS b/NEWS
index ac5a40c..f220f28 100644
--- a/NEWS
+++ b/NEWS
@@ -38,6 +38,7 @@ New in 2.2.8 2010-??-??: git version 2.2.7a, Libtool team:
- With binutils 2.19.50+, shared libraries can be built on AIX.
- Initial support for the Cuda Compiler Driver on GNU/Linux.
- Support for Haiku (i586-pc-haiku).
+ - Support for GCC link-time optimization (LTO) flags.
* Bug fixes:
diff --git a/libltdl/config/ltmain.m4sh b/libltdl/config/ltmain.m4sh
index 9e6646f..b4a23f6 100644
--- a/libltdl/config/ltmain.m4sh
+++ b/libltdl/config/ltmain.m4sh
@@ -4494,8 +4494,10 @@ func_mode_link ()
# -p, -pg, --coverage, -fprofile-* profiling flags for GCC
# @file GCC response files
# -tp=* Portland pgcc target processor selection
+ # -O*, -flto*, -fwhopr, -fuse-linker-plugin GCC link-time optimization
-64|-mips[0-9]|-r[0-9][0-9]*|-xarch=*|-xtarget=*|+DA*|+DD*|-q*|-m*| \
- -t[45]*|-txscale*|-p|-pg|--coverage|-fprofile-*|-F*|@*|-tp=*)
+ -t[45]*|-txscale*|-p|-pg|--coverage|-fprofile-*|-F*|@*|-tp=*| \
+ -O*|-flto*|-fwhopr|-fuse-linker-plugin)
func_quote_for_eval "$arg"
arg="$func_quote_for_eval_result"
func_append compile_command " $arg"
diff --git a/libltdl/m4/libtool.m4 b/libltdl/m4/libtool.m4
index 5e0bba7..a946493 100644
--- a/libltdl/m4/libtool.m4
+++ b/libltdl/m4/libtool.m4
@@ -3434,6 +3434,7 @@ 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
@@ -4451,7 +4452,7 @@ _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
@@ -5521,8 +5522,8 @@ 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'
@@ -5554,7 +5555,7 @@ if test "$_lt_caught_CXX_error" != yes; then
# Commands to make compiler produce verbose output that lists
# what "hidden" libraries, object files and flags are used when
# linking a shared library.
- output_verbose_link_cmd='$CC -shared $CFLAGS -v conftest.$objext 2>&1 |
$GREP -v "^Configured with:" | $GREP "\-L"'
+ output_verbose_link_cmd='$CC -shared $CFLAGS -v conftest.$objext 2>&1 |
$GREP "^ .*collect"'
else
GXX=no
@@ -6547,6 +6548,7 @@ if AC_TRY_EVAL(ac_compile); then
fi
;;
+ *.lto.$objext) ;; # Ignore GCC LTO objects
*.$objext)
# This assumes that the test object file only shows up
# once in the compiler output.
--
1.7.0.rc1.161.g90487
- [PATCH 1/4] Support GCC LTO on GNU/Linux.,
Ralf Wildenhues <=