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* gcc 4 features built-ins for atomic operations. If the macro

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B_USE_BUILTIN_ATOMIC_FUNCTIONS is defined most atomic_*() functions are
  redefined as macros using the built-ins directly.
* Enabled that feature for the x86 build. Might work on other platforms as
  well, but that needs to be tested.

No significant speedup for the -j8 Haiku image build.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@35018 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Ingo Weinhold
2010-01-11 21:38:07 +00:00
parent 1a837b3910
commit 4f7b2c67b0
2 changed files with 31 additions and 0 deletions
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build/jam/BuildSetup
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@@ -328,6 +328,11 @@ switch $(HAIKU_ARCH) {
HAIKU_C++FLAGS += -march=pentium ;
HAIKU_KERNEL_CCFLAGS += -march=pentium ;
HAIKU_KERNEL_C++FLAGS += -march=pentium ;
# Enable use of the gcc built-in atomic functions instead of atomic_*().
# The former are inlined and have thus less overhead. They are not
# available with gcc 2, but the header will take care of that.
HAIKU_DEFINES += B_USE_BUILTIN_ATOMIC_FUNCTIONS ;
}
}