re PR target/18145 (Do not emit __do_copy_data or __do_clear_bss if .data or .bss is empty.)

	PR target/18145
	* config/avr/avr.c (avr_asm_output_aligned_decl_common): Skip
	setting avr_need_clear_bss_p for __gnu_lto* symbols.

From-SVN: r184481

gcc/ChangeLog

 2012-02-22  Georg-Johann Lay  <avr@gjlay.de>
 
+	PR target/18145
+	* config/avr/avr.c (avr_asm_output_aligned_decl_common): Skip
+	setting avr_need_clear_bss_p for __gnu_lto* symbols.
+
+2012-02-22  Georg-Johann Lay  <avr@gjlay.de>
+
 	* config/avr/avr.h (avr_accumulate_outgoing_args): Return int.
 	* config/avr/avr.c (avr_accumulate_outgoing_args): Return int.	
 

gcc/config/avr/avr.c

@@ -7245,7 +7245,11 @@ avr_asm_output_aligned_decl_common (FILE * stream,
                                     unsigned HOST_WIDE_INT size,
                                     unsigned int align, bool local_p)
 {
-  avr_need_clear_bss_p = true;
+  /* __gnu_lto_v1 etc. are just markers for the linker injected by toplev.c.
+     There is no need to trigger __do_clear_bss code for them.  */
+
+  if (!STR_PREFIX_P (name, "__gnu_lto"))
+    avr_need_clear_bss_p = true;
 
   if (local_p)
     ASM_OUTPUT_ALIGNED_LOCAL (stream, name, size, align);