[Bug math/30550] New: powerpc64le: GCC-specific code for isinf() is being used on clang

["tuliom at ascii dot art.br" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30550

            Bug ID: 30550
           Summary: powerpc64le: GCC-specific code for isinf() is being
                    used on clang
           Product: glibc
           Version: 2.39
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: tuliom at ascii dot art.br
  Target Milestone: ---

The error can be reproduced with the following:

$ cat test-isinf.c 
#include <math.h>

_Bool classify(long double x) { return isinf(x); }

$ clang -c -mabi=ibmlongdouble -mfloat128 test-isinf.c 
test-isinf.c:3:46: error: passing 'long double' to parameter of incompatible
type '_Float128' (aka '__float128')
_Bool classify(long double x) { return isinf(x); }
                                             ^
/usr/include/math.h:1026:21: note: expanded from macro 'isinf'
     ? __isinff128 (x) : __builtin_isinf_sign (x))
                    ^
/usr/include/bits/mathcalls-helper-functions.h:29:45: note: passing argument to
parameter '__value' here
__MATHDECL_ALIAS (int, __isinf,, (_Mdouble_ __value), isinf)
                                            ^
1 error generated.

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