This works with gcc. Other compilers might need to have a flag
mapping added.
Signed-off-by: Mans Rullgard <m...@mansr.com>
---
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-asm disable 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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