Re: [libav-devel] [PATCH] configure: add --enable-lto option
On 10/03/2012 10:00 PM, Måns Rullgård wrote: > Luca Barbato writes: > >> On 10/03/2012 08:46 PM, Mans Rullgard wrote: >>> This works with gcc. Other compilers might need to have a flag >>> mapping added. >> >> The other I know about (clang, path64) have some more exotic ways (clang >> requires to pass around --plugin theirplugin.so to everything currently) > > clang -flto automatically passes the proper linker flags for gold. I'd > rather not install gold just for this, so I haven't tested if it > actually works. > Ok then lu ___ libav-devel mailing list libav-devel@libav.org https://lists.libav.org/mailman/listinfo/libav-devel
Re: [libav-devel] [PATCH] configure: add --enable-lto option
Luca Barbato writes: > On 10/03/2012 08:46 PM, Mans Rullgard wrote: >> This works with gcc. Other compilers might need to have a flag >> mapping added. > > The other I know about (clang, path64) have some more exotic ways (clang > requires to pass around --plugin theirplugin.so to everything currently) clang -flto automatically passes the proper linker flags for gold. I'd rather not install gold just for this, so I haven't tested if it actually works. -- Måns Rullgård m...@mansr.com ___ libav-devel mailing list libav-devel@libav.org https://lists.libav.org/mailman/listinfo/libav-devel
Re: [libav-devel] [PATCH] configure: add --enable-lto option
On 10/03/2012 08:46 PM, Mans Rullgard wrote: > This works with gcc. Other compilers might need to have a flag > mapping added. The other I know about (clang, path64) have some more exotic ways (clang requires to pass around --plugin theirplugin.so to everything currently) lu ___ libav-devel mailing list libav-devel@libav.org https://lists.libav.org/mailman/listinfo/libav-devel
Re: [libav-devel] [PATCH] configure: add --enable-lto option
Luca Barbato writes: > On 10/03/2012 08:46 PM, Mans Rullgard wrote: >> -check_cflags -fno-tree-vectorize >> +check_optflags -fno-tree-vectorize > > uhm? That is necessary to disable the vectoriser during linking. -- Måns Rullgård m...@mansr.com ___ libav-devel mailing list libav-devel@libav.org https://lists.libav.org/mailman/listinfo/libav-devel
Re: [libav-devel] [PATCH] configure: add --enable-lto option
Luca Barbato writes: > On 10/03/2012 08:46 PM, Mans Rullgard wrote: >> This works with gcc. Other compilers might need to have a flag >> mapping added. >> > which version you tested with lto? 4.7.2 can work? Some 4.7 seemed to work. 4.8 failed to link. -- Måns Rullgård m...@mansr.com ___ libav-devel mailing list libav-devel@libav.org https://lists.libav.org/mailman/listinfo/libav-devel
Re: [libav-devel] [PATCH] configure: add --enable-lto option
On 10/03/2012 08:56 PM, Luca Barbato wrote: > On 10/03/2012 08:46 PM, Mans Rullgard wrote: >> -check_cflags -fno-tree-vectorize >> +check_optflags -fno-tree-vectorize > > uhm? Ignore, I misread =P ___ libav-devel mailing list libav-devel@libav.org https://lists.libav.org/mailman/listinfo/libav-devel
Re: [libav-devel] [PATCH] configure: add --enable-lto option
On 10/03/2012 08:46 PM, Mans Rullgard wrote: > -check_cflags -fno-tree-vectorize > +check_optflags -fno-tree-vectorize uhm? ___ libav-devel mailing list libav-devel@libav.org https://lists.libav.org/mailman/listinfo/libav-devel
Re: [libav-devel] [PATCH] configure: add --enable-lto option
On 10/03/2012 08:46 PM, Mans Rullgard wrote: > This works with gcc. Other compilers might need to have a flag > mapping added. > which version you tested with lto? 4.7.2 can work? lu ___ libav-devel mailing list libav-devel@libav.org https://lists.libav.org/mailman/listinfo/libav-devel
[libav-devel] [PATCH] configure: add --enable-lto option
This works with gcc. Other compilers might need to have a flag
mapping added.
Signed-off-by: Mans Rullgard
---
configure | 38 +++---
1 file changed, 27 insertions(+), 11 deletions(-)
diff --git a/configure b/configure
index 6d68424..12f9872 100755
--- a/configure
+++ b/configure
@@ -240,6 +240,7 @@ Advanced options (experts only):
disable buffer boundary checking in bitreaders
(faster, but may crash)
--enable-memalign-hack emulate memalign, interferes with memory debuggers
+ --enable-lto use link-time optimization
Optimization options (experts only):
--disable-asmdisable all assembler optimizations
@@ -1287,6 +1288,7 @@ CMDLINE_SELECT="
extra_warnings
inline_asm
logging
+lto
optimizations
symver
yasm
@@ -3443,17 +3445,31 @@ void ff_foo(void) {}
EOF
fi
-if [ -n "$optflags" ]; then
-add_cflags $optflags
-elif enabled small; then
-add_cflags $cflags_size
-elif enabled optimizations; then
-add_cflags $cflags_speed
-else
-add_cflags $cflags_noopt
+if [ -z "$optflags" ]; then
+if enabled small; then
+optflags=$cflags_size
+elif enabled optimizations; then
+optflags=$cflags_speed
+else
+optflags=$cflags_noopt
+fi
fi
-check_cflags -fno-math-errno
-check_cflags -fno-signed-zeros
+
+check_optflags(){
+check_cflags "$@"
+enabled lto && check_ldflags "$@"
+}
+
+
+if enabled lto; then
+test "$cc_type" != "$ld_type" && die "LTO requires same compiler and
linker"
+check_cflags -flto
+check_ldflags -flto $cpuflags
+fi
+
+check_optflags $optflags
+check_optflags -fno-math-errno
+check_optflags -fno-signed-zeros
if enabled icc; then
# Just warnings, no remarks
@@ -3488,7 +3504,7 @@ elif enabled ccc; then
add_cflags -msg_disable ptrmismatch1
add_cflags -msg_disable unreachcode
elif enabled gcc; then
-check_cflags -fno-tree-vectorize
+check_optflags -fno-tree-vectorize
check_cflags -Werror=implicit-function-declaration
check_cflags -Werror=missing-prototypes
check_cflags -Werror=declaration-after-statement
--
1.7.12
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