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Test for availability of __sync builtins

from [Luke D]
Subject: Test for availability of __sync builtins
From: Luke D <ldalessandro@xxxxxxxxx>
Date: Wed, 23 Jul 2008 05:21:42 -0700 (PDT)
Newsgroups: gnu.gcc.help 

Does anyone have a good way to test for the availability of __sync_*
builtins on gcc 4.0+? I can't seem to find a defined macro, or even a
combination of macros that let me switch between using the builtins or
custom atomic ops code.

Luke
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