https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94194
--- Comment #2 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> --- Afaik the libc implementation is free to set any macro value for FE_*, although glibc and other implementations I am awre of try to make is related to architecture values when it does make sense (and it also tend to simplify the implementation). So I would expect that the compiler either would need to export a system-neutral value (GCC_FE_* or something related) with the drawback it would not be a direct replacement for the system library call (as other builtins tend to be) or define functions that does not use input arguments (something like __builtin_feraiseexcept_div_by_zero). For -fno-trapping-math I would expect to be a nop in such a scenario, although I haven't given much thought about it. However, I opened this bug more to check if this optimization would be worth implementing. My take is to remove it from glibc installed headers [1], and my impression is this should not add much from the compiler side of view as well. [1] https://sourceware.org/pipermail/libc-alpha/2020-March/111775.html
