[gomp4] Use OMP_SECTION_NAME_PREFIX in offload compilers

[Bernd Schmidt]

This makes us read in the offloaded functions in an offload compiler's 
lto1. This is essentially Michael Zolotukhin's patch 1/3 from a while ago.

Committed on gomp-4_0-branch.

Bernd
Index: gcc/lto/ChangeLog
===================================================================
--- gcc/lto/ChangeLog	(revision 208720)
+++ gcc/lto/ChangeLog	(working copy)
@@ -1,5 +1,11 @@
 2014-03-20  Bernd Schmidt  <ber...@codesourcery.com>
 
+	From Michael Zolotukhin.
+	* lto-object.c (lto_obj_add_section): Compare against the
+	section_name_prefix variable.
+	* lto.c (lto_section_with_id): Likewise.
+	(read_cgraph_and_symbols): Change it if ACCEL_COMPILER.
+
 	* lto-object.c: Include "lto-section-names.h".
 	(LTO_SEGMENT_NAME): Don't define.
 	* lto.c: Include "lto-section-names.h".
Index: gcc/lto/lto-object.c
===================================================================
--- gcc/lto/lto-object.c	(revision 208720)
+++ gcc/lto/lto-object.c	(working copy)
@@ -230,8 +230,7 @@ lto_obj_add_section (void *data, const c
   void **slot;
   struct lto_section_list *list = loasd->list;
 
-  if (strncmp (name, LTO_SECTION_NAME_PREFIX,
-	       strlen (LTO_SECTION_NAME_PREFIX)) != 0)
+  if (strncmp (name, section_name_prefix, strlen (section_name_prefix)))
     return 1;
 
   new_name = xstrdup (name);
Index: gcc/lto/lto.c
===================================================================
--- gcc/lto/lto.c	(revision 208720)
+++ gcc/lto/lto.c	(working copy)
@@ -2128,7 +2128,7 @@ lto_section_with_id (const char *name, u
 {
   const char *s;
 
-  if (strncmp (name, LTO_SECTION_NAME_PREFIX, strlen (LTO_SECTION_NAME_PREFIX)))
+  if (strncmp (name, section_name_prefix, strlen (section_name_prefix)))
     return 0;
   s = strrchr (name, '.');
   return s && sscanf (s, "." HOST_WIDE_INT_PRINT_HEX_PURE, id) == 1;
@@ -2903,6 +2903,10 @@ read_cgraph_and_symbols (unsigned nfiles
 
   timevar_push (TV_IPA_LTO_DECL_IN);
 
+#ifdef ACCEL_COMPILER
+    section_name_prefix = OMP_SECTION_NAME_PREFIX;
+#endif
+
   real_file_decl_data
     = decl_data = ggc_alloc_cleared_vec_lto_file_decl_data_ptr (nfiles + 1);
   real_file_count = nfiles;