sync_add_and_fetch problem

[Ian Lance Taylor]

Charles Crisler <charles.crisler@comcast.net> writes:

> Which file contains the definition of this built-in function?

It's an intrinsic implemented directly by the compiler.  If you mean:
which file in the compiler defines it, it will normally be found in
gcc/config/CPU/CPU.md or gcc/config/CPU/sync.md.

If you happen to be using a toolchain configured for i386, note that
you must use -march=i486 or later in order to use these functions
successfully.

Ian