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enable link time optimization when using GCC 4.6 or greater

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This commit is contained in:
Joel Dice 2011-03-26 14:44:08 -06:00
parent 01b3f1cb93
commit 6bd9ec3735
1 changed files with 13 additions and 0 deletions
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13
makefile
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@ -354,9 +354,22 @@ ifeq ($(mode),stress-major)
endif
ifeq ($(mode),fast)
optimization-cflags = -O3 -g3 -DNDEBUG
use-lto = true
endif
ifeq ($(mode),small)
optimization-cflags = -Os -g3 -DNDEBUG
use-lto = true
endif
ifeq ($(use-lto),true)
# only try to use LTO when GCC 4.6.0 or greater is available
gcc-major := $(shell $(cc) -dumpversion | cut -f1 -d.)
gcc-minor := $(shell $(cc) -dumpversion | cut -f2 -d.)
ifeq ($(shell expr 4 \< $(gcc-major) \
\| \( 4 \<= $(gcc-major) \& 6 \<= $(gcc-minor) \)),1)
optimization-cflags += -flto
lflags += $(optimization-cflags)
endif
endif
cflags += $(optimization-cflags)