[Patch,AVR,committed] PR18145 addendum: Don't trigger __do_clear_bss for lto markers

[Georg-Johann Lay]

http://gcc.gnu.org/viewcvs?view=revision&revision=184481

Committed to make dragging in startup code more precise.
Objects named like __gnu_lto_slim are just markers for the LTO machinery; there
is no need to trigger startup code for them, see also

http://gcc.gnu.org/ml/gcc/2012-02/msg00391.html

Johann

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

Index: config/avr/avr.c
===================================================================
--- config/avr/avr.c    (revision 184475)
+++ config/avr/avr.c    (working copy)
@@ -7245,7 +7245,11 @@ avr_asm_output_aligned_decl_common (FILE
                                     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);