[glibc] S390: Fp comparison are now raising FE_INVALID with gcc 10.

[Stefan Liebler <stli@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=64bca76f42a82e6a9ea2b0166deab7aa2b7efbea

commit 64bca76f42a82e6a9ea2b0166deab7aa2b7efbea
Author: Stefan Liebler <stli@linux.ibm.com>
Date:   Wed Nov 6 08:07:40 2019 +0100

    S390: Fp comparison are now raising FE_INVALID with gcc 10.
    
    The s390 gcc bug https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77918
    "S390: Floating point comparisons don't raise invalid for unordered operands."
    is fixed with gcc 10. Thus we conditionally set FIX_COMPARE_INVALID
    to 0 or 1.

Diff:
---
 sysdeps/s390/fpu/fix-fp-int-compare-invalid.h | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/sysdeps/s390/fpu/fix-fp-int-compare-invalid.h b/sysdeps/s390/fpu/fix-fp-int-compare-invalid.h
index dc2450c..440b3d0 100644
--- a/sysdeps/s390/fpu/fix-fp-int-compare-invalid.h
+++ b/sysdeps/s390/fpu/fix-fp-int-compare-invalid.h
@@ -27,10 +27,12 @@
    <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77918>.
    There exists an equivalent gcc bugzilla for Intel:
    <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52451>.
-   Once the s390 gcc bug is fixed, the definition of FIX_COMPARE_INVALID
-   should have a __GNUC_PREREQ conditional added so that e.g. the workaround
-   to call feraiseexcept (FE_INVALID) in math/s_iseqsig_template.c can be
-   avoided.  */
-#define FIX_COMPARE_INVALID 1
+   This s390 gcc bug is fixed with gcc 10, thus we don't need the workaround
+   to call feraiseexcept (FE_INVALID) in math/s_iseqsig_template.c.  */
+#if __GNUC_PREREQ (10, 0)
+# define FIX_COMPARE_INVALID 0
+#else
+# define FIX_COMPARE_INVALID 1
+#endif
 
 #endif /* fix-fp-int-compare-invalid.h */