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Revert to -O3 with Clang

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Instead of -O4 option that does not work with both mingw and
Linux gcc (tested with Clang 3.1).

As reported by Reed Kotler:
Turns out that -O4 is not a valid option for clang unless you have
the proper gold linker and plugins built. That's because -O4 enables
LTO, which writes out bitcode files during the compile, and then loads
those and optimizes them during the link phase.

It requires a linker that supports LLVM's LTO. There is a plugin for
Gold available as part of LLVM.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2012-07-07 19:00:05 +01:00
parent 0b3ffb54b7
commit 089e54c7fd
1 changed files with 2 additions and 1 deletions
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3
src/Makefile
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@ -270,7 +270,8 @@ ifeq ($(optimize),yes)
endif
ifeq ($(comp),clang)
CXXFLAGS += -O4
### -O4 requires a linker that supports LLVM's LTO
CXXFLAGS += -O3
ifeq ($(os),osx)
ifeq ($(arch),i386)