Ignore __FPCLASS_* macros that are new with Clang 17.
diff --git a/Makefile b/Makefile
index f350ecb..981da98 100644
--- a/Makefile
+++ b/Makefile
@@ -702,6 +702,7 @@ check-symbols: startup_files libc
 	    | sed -e 's/__GNUC_VA_LIST $$/__GNUC_VA_LIST 1/' \
 	    | grep -v '^#define __\(BOOL\|INT_\(LEAST\|FAST\)\(8\|16\|32\|64\)\|INT\|LONG\|LLONG\|SHRT\)_WIDTH__' \
 	    | grep -v '^#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_\(1\|2\|4\|8\)' \
+	    | grep -v '^#define __FPCLASS_\(\(NEG\|POS\)\(INF\|NORMAL\|SUBNORMAL\|ZERO\)\|[QS]NAN\)' \
 	    > "$(SYSROOT_SHARE)/predefined-macros.txt"
 
 	# Check that the computed metadata matches the expected metadata.