libgcc: Dont define __do_global_dtors_aux if it will be empty

2019-12-09  Jozef Lawrynowicz  <jozef.l@mittosystems.com>

	* crtstuff.c (__do_global_dtors_aux): Wrap in #if so it's only defined
	if it will have contents.

From-SVN: r279123

libgcc/ChangeLog

+2019-12-09  Jozef Lawrynowicz  <jozef.l@mittosystems.com>
+
+	* crtstuff.c (__do_global_dtors_aux): Wrap in #if so it's only defined
+	if it will have contents.
+
 2019-12-05  Georg-Johann Lay  <avr@gjlay.de>
 
 	PR target/92055

libgcc/crtstuff.c

@@ -364,8 +364,12 @@ extern void __cxa_finalize (void *) TARGET_ATTRIBUTE_WEAK;
    On some systems, this routine is run more than once from the .fini,
    when exit is called recursively, so we arrange to remember where in
    the list we left off processing, and we resume at that point,
-   should we be re-invoked.  */
+   should we be re-invoked.
 
+   This routine does not need to be run if none of the following clauses are
+   true, as it will not do anything, so can be removed.  */
+#if defined(CRTSTUFFS_O) || !defined(FINI_ARRAY_SECTION_ASM_OP) \
+  || USE_TM_CLONE_REGISTRY || USE_EH_FRAME_REGISTRY
 static void __attribute__((used))
 __do_global_dtors_aux (void)
 {
@@ -451,6 +455,8 @@ __do_global_dtors_aux_1 (void)
 CRT_CALL_STATIC_FUNCTION (__LIBGCC_INIT_SECTION_ASM_OP__,
 			  __do_global_dtors_aux_1)
 #endif
+#endif /* defined(CRTSTUFFS_O) || !defined(FINI_ARRAY_SECTION_ASM_OP)
+  || defined(USE_TM_CLONE_REGISTRY) || defined(USE_EH_FRAME_REGISTRY) */
 
 #if defined(USE_EH_FRAME_REGISTRY) || USE_TM_CLONE_REGISTRY
 /* Stick a call to __register_frame_info into the .init section.  For some