[Bug c/117024] [C2y] Implement N3349, Abs Without Undefined Behavior

[jsm28 at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117024

--- Comment #1 from Joseph S. Myers <jsm28 at gcc dot gnu.org> ---
For GCC, this means built-in functions (this is also a library feature).