[glibc] Stop applying a GCC-specific workaround on clang [BZ #30550]

[glibc] Stop applying a GCC-specific workaround on clang [BZ #30550]

[Tulio Magno Quites Machado Filho]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=0a9e93842d8e535ac8174cb4ff7fb830b20e4ae7

commit 0a9e93842d8e535ac8174cb4ff7fb830b20e4ae7
Author: Tulio Magno Quites Machado Filho <tuliom@redhat.com>
Date:   Tue Jun 13 18:56:33 2023 -0300

    Stop applying a GCC-specific workaround on clang [BZ #30550]
    
    GCC was the only compiler affected by the issue with
    __builtin_isinf_sign and float128.
    
    Fix BZ #30550.
    
    Reported-by: Qiu Chaofan <qiucofan@cn.ibm.com>
    Reviewed-by: Florian Weimer <fweimer@redhat.com>

Diff:
---
 math/math.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/math/math.h b/math/math.h
index 6427c72276..f13639943e 100644
--- a/math/math.h
+++ b/math/math.h
@@ -1015,7 +1015,8 @@ enum
 
 /* Return nonzero value if X is positive or negative infinity.  */
 # if __HAVE_DISTINCT_FLOAT128 && !__GNUC_PREREQ (7,0) \
-     && !defined __SUPPORT_SNAN__ && !defined __cplusplus
+     && !defined __SUPPORT_SNAN__ && !defined __cplusplus \
+     && !defined __clang__
    /* Since __builtin_isinf_sign is broken for float128 before GCC 7.0,
       use the helper function, __isinff128, with older compilers.  This is
       only provided for C mode, because in C++ mode, GCC has no support