[libcxx-commits] [libcxx] [libcxx] Undefine all supported C math functions (PR #94533)

[Nikolas Klauser via libcxx-commits]

philnik777 wrote:

> We trying to use libc++ with FreeRTOS which defines some of the `math.h` standard C library functions as macros which is allowed by the C standard but it breaks libc++ headers. libc++ should undefine the macro before providing the symbol of the same name (just like it already does for some of them).

Are you sure that the C standard allows this? The ones we `#undef`ine (`fpclassify`, `signbit`, `isfinite` and friends) are specified as macros in the standard, while `acos`, `atan` etc. are specified as functions.


https://github.com/llvm/llvm-project/pull/94533