[SPARC] Fix PR target/68408

[Eric Botcazou]

This is the breakage of the init_priority attribute on sparc-elf, a regression 
from older releases in the 4.x series.

Tested on sparc-elf, applied on all active branches.


2015-11-19  Eric Botcazou  <ebotca...@adacore.com>

        PR target/68408
        * config/sparc/sp-elf.h (CTORS_SECTION_ASM_OP): Undefine.
        (DTORS_SECTION_ASM_OP): Likewise.

-- 
Eric Botcazou
Index: config/sparc/sp-elf.h
===================================================================
--- config/sparc/sp-elf.h	(revision 230589)
+++ config/sparc/sp-elf.h	(working copy)
@@ -53,6 +53,10 @@ along with GCC; see the file COPYING3.
 #undef  ASM_GENERATE_INTERNAL_LABEL
 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM)	\
   sprintf ((LABEL), "*.L%s%ld", (PREFIX), (long)(NUM))
+
+/* We use GNU ld so undefine this so that attribute((init_priority)) works.  */
+#undef CTORS_SECTION_ASM_OP
+#undef DTORS_SECTION_ASM_OP
 
 /* ??? Inherited from sol2.h.  Probably wrong.  */
 #undef WCHAR_TYPE