[libcxx-commits] [libcxx] [libcxx] Undefine all supported C math functions (PR #94533)
Nikolas Klauser via libcxx-commits
libcxx-commits at lists.llvm.org
Sun Oct 6 10:23:22 PDT 2024
================
@@ -307,53 +307,79 @@ long double truncl(long double x);
// back to C++ linkage before including these C++ headers.
extern "C++" {
-# ifdef fpclassify
-# undef fpclassify
-# endif
-
-# ifdef signbit
-# undef signbit
-# endif
-
-# ifdef isfinite
-# undef isfinite
-# endif
-
-# ifdef isinf
-# undef isinf
-# endif
-
-# ifdef isnan
-# undef isnan
-# endif
-
-# ifdef isnormal
-# undef isnormal
-# endif
-
-# ifdef isgreater
-# undef isgreater
-# endif
-
-# ifdef isgreaterequal
-# undef isgreaterequal
-# endif
-
-# ifdef isless
-# undef isless
-# endif
-
-# ifdef islessequal
-# undef islessequal
-# endif
-
-# ifdef islessgreater
-# undef islessgreater
-# endif
-
-# ifdef isunordered
-# undef isunordered
-# endif
+// According to section 7.1.4 Use of library functions of the C standard, any
----------------
philnik777 wrote:
@ldionne Consider
```c++
#include <__math/traits.h>
#include <math.h>
```
The `__math/traits.h` would try to `#undef` a macro that will only be defined when including `math.h`. Does that make it clearer?
https://github.com/llvm/llvm-project/pull/94533
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