[Bug c++/52929] use of undeclared identifier '__ATOMIC_ACQ_REL'

[amacleod at redhat dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52929

Andrew Macleod <amacleod at redhat dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |amacleod at redhat dot com

--- Comment #2 from Andrew Macleod <amacleod at redhat dot com> 2012-04-10 20:18:01 UTC ---
It is built in to the C preprocessor as a predefined value in GCC 4.7  (see
cppbuiltin.c), so you wouldn't find a specific #define anywhere.  

The __atomic built-ins don't work properly without at least a GCC 4.7 compiler,
so you wouldn't be able to compile them properly with a different compiler.