#if _GLIBCXX_USE_C99_MATH
#if !_GLIBCXX_USE_C99_FP_MACROS_DYNAMIC
-// These are possible macros imported from C99-land. For strict
-// conformance, remove possible C99-injected names from the global
-// namespace, and sequester them in the __gnu_cxx extension namespace.
-// Only undefine the C99 FP macros, if actually captured for namespace movement
+// These are possible macros imported from C99-land.
#undef fpclassify
#undef isfinite
#undef isinf