[Bug middle-end/102129] -ftrapping-math is broken or badly documented

[vincent-gcc at vinc17 dot net via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102129

--- Comment #3 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> ---
Implementation details about trap enablement is outside the scope of ISO C, but
the existence of traps is explicitly allowed by Annex F (when supported). F.8
says: "It includes also IEC 60559 dynamic rounding precision and trap
enablement modes, if the implementation supports them."

Note that Glibc provides feenableexcept and fedisableexcept to enable and
disable traps, and GCC should not ignore this possibility.