posix: Fix fnmatch.c on bootstrap

Only define FALLTHROUGH for _LIBC and do not check __clang_major__
value.

It partially syncs with gnulib 5c52f00c69f39fe.

Checked with build-many-glibcs.py for aarch64-linux-gnu.

diff --git a/posix/fnmatch.c b/posix/fnmatch.c
index 5896812c966ac7c60530f5475d3c99726b6ba107..b8a71f164d80e25b1f92cf478f86d5a9c6b116b1 100644 (file)
--- a/posix/fnmatch.c
+++ b/posix/fnmatch.c
@@ -64,7 +64,7 @@ extern int fnmatch (const char *pattern, const char *string, int flags);
 #endif
 
 #ifdef _LIBC
-# if (__GNUC__ >= 7) || (__clang_major__ >= 10)
+# if __GNUC__ >= 7
 #  define FALLTHROUGH __attribute__ ((__fallthrough__))
 # else
 #  define FALLTHROUGH ((void) 0)