use of undeclared identifier '__ATOMIC_ACQ_REL' when building llvm-3.1 on Fedora 17

Ilyes Gouta ilyes.gouta at
Sun Sep 2 09:51:08 UTC 2012

Hi Lars,

Indeed! I removed an older clang-3.0 package before rebuilding the f18 set.

Cool. The builds should now complete then.


On Sun, Sep 2, 2012 at 10:29 AM, Lars Seipel <lars.seipel at> wrote:
> On Saturday 01 September 2012 15:06:40 Ilyes Gouta wrote:
>> and this is with gcc version 4.7.0 20120507 (Red Hat 4.7.0-5) (GCC).
> This doesn't look like you're building with GCC. Do you have an older version
> of clang somewhere in your path? IIRC llvm's configure script prefers to choose
> clang when it's there. Clang then chokes on the libstdc++ headers.
> Lars
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