/usr/include/clc/atomic/atomic_add.h is in libclc-dev 0~git20140101-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | #define __CLC_FUNCTION atomic_add
#include <clc/atomic/atomic_decl.inc>
#undef __CLC_FUNCTION
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