[Bug math/21930] C-only gcc builtins used in <math.h> isinf

["joseph at codesourcery dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21930

--- Comment #9 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
Most of the macros, including fpclassify, should be irrelevant because 
libstdc++ headers undefine the macros and replace them with function 
overloads (as required by the C++ standard).  The problem with iszero is 
specifically that the C++ iszero definition in the C math.h is using the 
macro fpclassify definition (this is before libstdc++ gets a chance to 
undefine it), and, in the case (__SUPPORT_SNAN__ and float128 supported), 
that definition is using __builtin_types_compatible_p.  So some approach 
is needed for iszero to work in that place - without conflicting with 
libstdc++'s own fpclassify overloads.

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