[headers] Unclear status for floating-point classification/comparison functions

[frederick-vs-ja]

[headers]/5 especially mentions "names which are defined as macros in C", which include floating-point classification/comparison functions (fpclassify, isless, etc.).

So, is <cmath> disallowed to declare them in the global namespace as they seem to be excluded from "these names"?

Also, [headers]/6 states

Names which are defined as macros in C shall be defined as macros in the C++ standard library, even if C grants license for implementation as functions.

Does this mean that despite being functions, these names also need to be defined as macros in C++?

I think both answers are "no". Not sure whether this needs an LWG issue.

[jwakely]

This needs a library issue. We need to separate the C++ spec from the limitations of C that requires using macros for overloading.