[gcc r12-6515] libgfortran: Fix build on non-glibc targets

[gcc r12-6515] libgfortran: Fix build on non-glibc targets

[Jakub Jelinek]

https://gcc.gnu.org/g:7c3b9c17363bf30fcab9814252b9d5860711a10b

commit r12-6515-g7c3b9c17363bf30fcab9814252b9d5860711a10b
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Wed Jan 12 09:43:18 2022 +0100

    libgfortran: Fix build on non-glibc targets
    
    When the __GLIBC_PREREQ macro isn't defined, the
      #if ... && defined __GLIBC_PREREQ && __GLIBC_PREREQ (2, 32)
    directive has invalid syntax - the __GLIBC_PREREQ in there evaluates
    to 0 and is followed by (2, 32).
    
    2022-01-12  Jakub Jelinek  <jakub@redhat.com>
    
            * libgfortran.h (POWER_IEEE128): Use __GLIBC_PREREQ in a separate
            #if directive inside of #if ... && defined __GLIBC_PREREQ.

Diff:
---
 libgfortran/libgfortran.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libgfortran/libgfortran.h b/libgfortran/libgfortran.h
index 2aec78fc401..4329d4c87bc 100644
--- a/libgfortran/libgfortran.h
+++ b/libgfortran/libgfortran.h
@@ -104,9 +104,11 @@ typedef off_t gfc_offset;
 #endif
 
 #if defined(__powerpc64__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ \
-    && defined __GLIBC_PREREQ && __GLIBC_PREREQ (2, 32)
+    && defined __GLIBC_PREREQ
+#if __GLIBC_PREREQ (2, 32)
 #define POWER_IEEE128 1
 #endif
+#endif
 
 /* These functions from <ctype.h> should only be used on values that can be
    represented as unsigned char, otherwise the behavior is undefined.