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-rw-r--r--config.lib54
1 files changed, 50 insertions, 4 deletions
diff --git a/config.lib b/config.lib
index 3e06ff731..1ddf5f1d1 100644
--- a/config.lib
+++ b/config.lib
@@ -48,6 +48,7 @@ set_default() {
enable_debug="0"
enable_desync_debug="0"
enable_profiling="0"
+ enable_lto="0"
enable_dedicated="0"
enable_network="1"
enable_static="1"
@@ -117,6 +118,7 @@ set_default() {
enable_debug
enable_desync_debug
enable_profiling
+ enable_lto
enable_dedicated
enable_network
enable_static
@@ -264,6 +266,10 @@ detect_params() {
--enable-desync-debug=*) enable_desync_debug="$optarg";;
--enable-profiling) enable_profiling="1";;
--enable-profiling=*) enable_profiling="$optarg";;
+ --enable-lto) enable_lto="1";;
+ --enable-lto=*) enable_lto="$optarg";;
+ --enable-ipo) enable_lto="1";;
+ --enable-ipo=*) enable_lto="$optarg";;
--enable-dedicated) enable_dedicated="1";;
--enable-dedicated=*) enable_dedicated="$optarg";;
--enable-network=*) enable_network="$optarg";;
@@ -596,6 +602,21 @@ check_params() {
sleep 5
fi
+ if [ "$enable_lto" != "0" ]; then
+ has_lto=`($cxx_build -dumpspecs 2>&1 | grep '\%{flto}') || ($cxx_build -help ipo 2>&1 | grep '\-ipo')`
+ if [ -n "$has_lto" ]; then
+ log 1 "using link time optimization... yes"
+ else
+ enable_lto="0"
+ log 1 "using link time optimization... no"
+ log 1 "WARNING: you selected link time optimization but it is not found."
+ sleep 5
+ fi
+ else
+ log 1 "using link time optimization... no"
+ fi
+
+
if [ "$os" != "OSX" ] && [ "$with_osx_sysroot" != "0" ]; then
if [ "$with_osx_sysroot" = "1" ]; then
with_osx_sysroot="0"
@@ -1088,6 +1109,13 @@ make_compiler_cflags() {
# Use c++0x mode so static_assert() is available
cxxflags="$cxxflags -std=c++0x"
fi
+
+ has_ipo=`$1 -help ipo | grep '\-ipo'`
+ if [ "$enable_lto" != "0" ] && [ -n "$has_ipo" ]; then
+ # Use IPO (only if we see IPO exists and is requested)
+ flags="$flags -ipo"
+ ldflags="$ldflags -ipo $CFLAGS"
+ fi
else
# Enable some things only for certain GCC versions
cc_version=`$1 -dumpversion | cut -c 1,3`
@@ -1113,6 +1141,7 @@ make_compiler_cflags() {
# break anything. So disable strict-aliasing to make the
# compiler all happy.
flags="$flags -fno-strict-aliasing"
+ ldflags="$ldflags -fno-strict-aliasing"
# Warn about casting-out 'const' with regular C-style cast.
# The preferred way is const_cast<>() which doesn't warn.
flags="$flags -Wcast-qual"
@@ -1124,6 +1153,7 @@ make_compiler_cflags() {
# sure that they will not happen. It furthermore complains
# about it's own optimized code in some places.
flags="$flags -fno-strict-overflow"
+ ldflags="$ldflags -fno-strict-overflow"
fi
if [ $cc_version -ge 43 ]; then
@@ -1132,6 +1162,16 @@ make_compiler_cflags() {
cxxflags="$cxxflags -std=gnu++0x"
fi
+ if [ $cc_version -ge 45 ]; then
+ # Only GCC 4.5+ has (possibly) LTO
+ has_lto=`$1 -dumpspecs | grep '\%{flto}'`
+ if [ "$enable_lto" != "0" ] && [ -n "$has_lto" ]; then
+ # Use LTO only if we see LTO exists and is requested
+ flags="$flags -flto"
+ ldflags="$ldflags -flto $CFLAGS"
+ fi
+ fi
+
has_rdynamic=`$1 -dumpspecs | grep rdynamic`
if [ -n "$has_rdynamic" ]; then
# rdynamic is used to get useful stack traces from crash reports.
@@ -1153,7 +1193,7 @@ make_cflags_and_ldflags() {
# LDFLAGS for BUILD
LDFLAGS_BUILD=""
# General CFlags for HOST
- CFLAGS="$CFLAGS -D$os"
+ CFLAGS="$CFLAGS"
# Special CXXFlags for HOST
CXXFLAGS="$CXXFLAGS"
# Libs to compile. In fact this is just LDFLAGS
@@ -1161,6 +1201,11 @@ make_cflags_and_ldflags() {
# LDFLAGS used for HOST
LDFLAGS="$LDFLAGS"
+ make_compiler_cflags "$cc_build" "$CFLAGS_BUILD" "CFLAGS_BUILD" "$CXXFLAGS_BUILD" "CXXFLAGS_BUILD" "$LDFLAGS_BUILD" "LDFLAGS_BUILD"
+ make_compiler_cflags "$cc_host" "$CFLAGS" "CFLAGS" "$CXXFLAGS" "CXXFLAGS" "$LDFLAGS" "LDFLAGS"
+
+ CFLAGS="$CFLAGS -D$os"
+
if [ $enable_debug = 0 ]; then
# No debug, add default stuff
OBJS_SUBDIR="release"
@@ -1174,6 +1219,7 @@ make_cflags_and_ldflags() {
fi
CFLAGS="-O2 -fomit-frame-pointer $CFLAGS"
+ LDFLAGS="-O2 -fomit-frame-pointer $LDFLAGS"
fi
else
OBJS_SUBDIR="debug"
@@ -1187,6 +1233,7 @@ make_cflags_and_ldflags() {
fi
if [ $enable_debug -ge 2 ]; then
CFLAGS="$CFLAGS -fno-inline"
+ LDFLAGS="$LDFLAGS -fno-inline"
fi
if [ $enable_debug -ge 3 ]; then
CFLAGS="$CFLAGS -O0"
@@ -1204,9 +1251,6 @@ make_cflags_and_ldflags() {
CFLAGS="$CFLAGS -DNO_THREADS"
fi
- make_compiler_cflags "$cc_build" "$CFLAGS_BUILD" "CFLAGS_BUILD" "$CXXFLAGS_BUILD" "CXXFLAGS_BUILD" "$LDFLAGS_BUILD" "LDFLAGS_BUILD"
- make_compiler_cflags "$cc_host" "$CFLAGS" "CFLAGS" "$CXXFLAGS" "CXXFLAGS" "$LDFLAGS" "LDFLAGS"
-
if [ "`echo $1 | cut -c 1-3`" != "icc" ]; then
if [ "$os" = "CYGWIN" ]; then
flags="$flags -mwin32"
@@ -3037,6 +3081,8 @@ showhelp() {
echo " --enable-debug[=LVL] enable debug-mode (LVL=[0123], 0 is release)"
echo " --enable-desync-debug=[LVL] enable desync debug options (LVL=[012], 0 is none"
echo " --enable-profiling enables profiling"
+ echo " --enable-lto enables GCC's Link Time Optimization (LTO)/ICC's"
+ echo " Interprocedural Optimization if available"
echo " --enable-dedicated compile a dedicated server (without video)"
echo " --enable-static enable static compile (doesn't work for"
echo " all HOSTs)"