Bug 22535 – ImportC: gcc/clang math intrinsics are rejected.

math.h on macOS uses the following gcc/clang builtins: `__builtin_fabs` `__builtin_fabsf` `__builtin_fabsl `__builtin_fabsl` `__builtin_inf` `__builtin_inff` `__builtin_infl` A much larger list of these builtins are described here: https://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html It’s common for this header to be directly or transitively included. It is possible at least on macOS to avoid these if you preprocess with the -ffast-math flag as then it will counterintuitively declare extern versions of functions like isfinite instead of defining them as inline functions using these intrinsics. I don’t know if we want dmd to actually recognize all of these intrinsics.

With https://github.com/dlang/dmd/pull/13532 these can all be supported by adding code to __builtins.d in druntime.

@WalterBright created dlang/druntime pull request #3702 "fix Issue 22535 - ImportC: gcc/clang math intrinsics are rejected" fixing this issue: - fix Issue 22535 - ImportC: gcc/clang math intrinsics are rejected https://github.com/dlang/druntime/pull/3702

dlang/druntime pull request #3702 "fix Issue 22535 - ImportC: gcc/clang math intrinsics are rejected" was merged into master: - e6a04f222cdf8ee1a6d1cf9fc7dc97118ccfbbbd by Walter Bright: fix Issue 22535 - ImportC: gcc/clang math intrinsics are rejected https://github.com/dlang/druntime/pull/3702