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Rewrite link time optimization in Makefile

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Instead of binding link time optimization to the choice of
popcount support, do the right thing and add -flto option
when gcc 4.5 or later is detected.

Although it should be supported also under mingw, it happens
that it doesn't, at least on my 4.6.1 due to some known bugs.

Thanks to Mike for helping me with this patch.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2011-11-12 10:10:01 +01:00
parent a40ded2884
commit c4fc82c6b7
1 changed files with 12 additions and 8 deletions
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20
src/Makefile
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@ -308,15 +308,19 @@ endif
### 3.10 popcnt
ifeq ($(popcnt),yes)
CXXFLAGS += -DUSE_POPCNT
CXXFLAGS += -msse3 -DUSE_POPCNT
endif
### For gcc we add also msse3 support and Link Time Optimization, note that
### this is a mix of compile and link time options because the lto link phase
### needs access to the optimization flags.
ifeq ($(comp),gcc)
CXXFLAGS += -msse3 -flto
LDFLAGS += $(CXXFLAGS)
endif
### 3.11 Link Time Optimization, it works since gcc 4.5 but not on mingw.
### This is a mix of compile and link time options because the lto link phase
### needs access to the optimization flags.
ifeq ($(comp),gcc)
GCC_MAJOR := `gcc -dumpversion | cut -f1 -d.`
GCC_MINOR := `gcc -dumpversion | cut -f2 -d.`
ifeq (1,$(shell expr \( $(GCC_MAJOR) \> 4 \) \| \( $(GCC_MAJOR) \= 4 \& $(GCC_MINOR) \>= 5 \)))
CXXFLAGS += -flto
LDFLAGS += $(CXXFLAGS)
endif
endif
### ==========================================================================