Don't strip debug symbols from x86_64 libm.a - it's a gnu ld script

glibc.spec

@@ -1123,9 +1123,18 @@ touch %{buildroot}%{_sysconfdir}/ld.so.cache
 # Strip debugging info from all static libraries
 pushd %{buildroot}%{_libdir}
     for i in *.a; do
-	if [ -f "$i" ]; then
-	    strip -g -R .comment -R .GCC.command.line $i
-	fi
+        if [ -f "$i" ]; then
+            case "$i" in
+%ifarch x86_64
+# libm.a is a gnu ld script for glibc 2.28
+%if "%{version}" == "2.28"
+                libm.a) ;;
+%endif
+%endif
+                *_p.a) ;;
+                *) strip -g -R .comment -R .GCC.command.line $i;;
+            esac
+        fi
     done
 popd