[Bug math/26621] ICC Error when including tgmath.h on Ubuntu 20.04

[joseph at codesourcery dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=26621

--- Comment #4 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
The real question here is whether ICC supports any of the approaches used 
in glibc's tgmath.h to implement the type-generic macros, which involve 
various GCC extensions.  If it doesn't support them, the "#if 
__GNUC_PREREQ (2, 7)" would need to change to disallow ICC, or else a new 
implementation approach would need to be added.  If it does support them, 
then we get into ensuring the other macros regarding supported types are 
defined appropriately for the ICC case.

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