Do not emit __gnu_lto_v1 symbol.

2019-07-22  Martin Liska  <mliska@suse.cz>

	* config/avr/avr.c (avr_asm_output_aligned_decl_common): Update
	comment.
	* toplev.c (compile_file): Do not emit __gnu_lto_v1 symbol.
2019-07-22  Martin Liska  <mliska@suse.cz>

	* config/pa/stublib.c: Remove stub symbol __gnu_lto_v1.
	* config/pa/t-stublib: Likewise.
2019-07-22  Martin Liska  <mliska@suse.cz>

	* simple-object-elf.c (simple_object_elf_copy_lto_debug_sections):
	Do not search for gnu_lto_v1, but search for first '\0'.

From-SVN: r273662

gcc/ChangeLog

 2019-07-22  Martin Liska  <mliska@suse.cz>
 
+	* config/avr/avr.c (avr_asm_output_aligned_decl_common): Update
+	comment.
+	* toplev.c (compile_file): Do not emit __gnu_lto_v1 symbol.
+
+2019-07-22  Martin Liska  <mliska@suse.cz>
+
 	* lto-section-in.c (lto_get_section_data):
 	Use new function get_compression.
 	* lto-streamer-out.c (produce_lto_section): Use

gcc/config/avr/avr.c

@@ -10163,7 +10163,7 @@ avr_asm_output_aligned_decl_common (FILE * stream,
       return;
     }
 
-  /* __gnu_lto_v1 etc. are just markers for the linker injected by toplev.c.
+  /* __gnu_lto_slim is just a marker 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"))

gcc/toplev.c

@@ -543,27 +543,6 @@ compile_file (void)
       process_pending_assemble_externals ();
    }
 
-  /* Emit LTO marker if LTO info has been previously emitted.  This is
-     used by collect2 to determine whether an object file contains IL.
-     We used to emit an undefined reference here, but this produces
-     link errors if an object file with IL is stored into a shared
-     library without invoking lto1.  */
-  if (flag_generate_lto || flag_generate_offload)
-    {
-#if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
-      ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, NULL_TREE,
-				      "__gnu_lto_v1",
-				      HOST_WIDE_INT_1U, 8);
-#elif defined ASM_OUTPUT_ALIGNED_COMMON
-      ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, "__gnu_lto_v1",
-				 HOST_WIDE_INT_1U, 8);
-#else
-      ASM_OUTPUT_COMMON (asm_out_file, "__gnu_lto_v1",
-			 HOST_WIDE_INT_1U,
-			 HOST_WIDE_INT_1U);
-#endif
-    }
-
   /* Let linker plugin know that this is a slim object and must be LTOed
      even when user did not ask for it.  */
   if (flag_generate_lto && !flag_fat_lto_objects)

libgcc/ChangeLog

+2019-07-22  Martin Liska  <mliska@suse.cz>
+
+	* config/pa/stublib.c: Remove stub symbol __gnu_lto_v1.
+	* config/pa/t-stublib: Likewise.
+
 2019-07-22  Stafford Horne  <shorne@gmail.com>
 
 	PR target/90362

libgcc/config/pa/stublib.c

@@ -115,7 +115,3 @@ pthread_once (void)
   return 0;
 }
 #endif
-
-#ifdef L_gnu_lto_v1
-char gnu_lto_v1;
-#endif

libgcc/config/pa/t-stublib

@@ -3,8 +3,7 @@ LIBGCCSTUB_OBJS = rfi-stub.o dfi-stub.o ritm-stub.o ditm-stub.o \
 	pthread_default_stacksize_np-stub.o \
 	pthread_mutex_lock-stub.o \
 	pthread_mutex_unlock-stub.o \
-	pthread_once-stub.o \
-	gnu_lto_v1-stub.o
+	pthread_once-stub.o
 
 rfi-stub.o: $(srcdir)/config/pa/stublib.c
 	$(gcc_compile) -c -O2 -DL_register_frame_info $<
@@ -36,9 +35,6 @@ pthread_mutex_unlock-stub.o: $(srcdir)/config/pa/stublib.c
 pthread_once-stub.o: $(srcdir)/config/pa/stublib.c
 	$(gcc_compile) -c -O2 -DL_pthread_once $<
 
-gnu_lto_v1-stub.o: $(srcdir)/config/pa/stublib.c
-	$(gcc_compile) -c -O2 -DL_gnu_lto_v1 $<
-
 libgcc_stub.a: $(LIBGCCSTUB_OBJS)
 	-rm -rf $@
 	$(AR) rc $@ $(LIBGCCSTUB_OBJS)

libiberty/ChangeLog

+2019-07-22  Martin Liska  <mliska@suse.cz>
+
+	* simple-object-elf.c (simple_object_elf_copy_lto_debug_sections):
+	Do not search for gnu_lto_v1, but search for first '\0'.
+
 2019-07-18  Eduard-Mihai Burtescu  <eddyb@lyken.rs>
 
 	* cplus-dem.c: Include rust-demangle.h.

libiberty/simple-object-elf.c

@@ -1358,9 +1358,8 @@ simple_object_elf_copy_lto_debug_sections (simple_object_read *sobj,
 	  return errmsg;
 	}
 
-      /* If we are processing .symtab purge __gnu_lto_v1 and
-	 __gnu_lto_slim symbols from it and any symbols in discarded
-	 sections.  */
+      /* If we are processing .symtab purge __gnu_lto_slim symbol
+	 from it and any symbols in discarded sections.  */
       if (sh_type == SHT_SYMTAB)
 	{
 	  unsigned entsize = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
@@ -1380,14 +1379,9 @@ simple_object_elf_copy_lto_debug_sections (simple_object_read *sobj,
 				       sobj->offset + stroff,
 				       (unsigned char *)strings,
 				       strsz, &errmsg, err);
-	  /* Find gnu_lto_ in strings.  */
-	  while ((gnu_lto = (char *) memchr (gnu_lto, 'g',
-					     strings + strsz - gnu_lto)))
-	    if (strncmp (gnu_lto, "gnu_lto_v1",
-			 strings + strsz - gnu_lto) == 0)
-	      break;
-	    else
-	      gnu_lto++;
+	  /* Find first '\0' in strings.  */
+	  gnu_lto = (char *) memchr (gnu_lto, '\0',
+				     strings + strsz - gnu_lto + 1);
 	  /* Read the section index table if present.  */
 	  if (symtab_indices_shndx[i - 1] != 0)
 	    {
@@ -1461,10 +1455,9 @@ simple_object_elf_copy_lto_debug_sections (simple_object_read *sobj,
 			 undefined and sharing the gnu_lto_ name.  */
 		      bind = STB_WEAK;
 		      other = STV_HIDDEN;
-		      if (gnu_lto)
-			ELF_SET_FIELD (type_functions, ei_class, Sym,
-				       ent, st_name, Elf_Word,
-				       gnu_lto - strings);
+		      ELF_SET_FIELD (type_functions, ei_class, Sym,
+				     ent, st_name, Elf_Word,
+				     gnu_lto - strings);
 		      ELF_SET_FIELD (type_functions, ei_class, Sym,
 				     ent, st_shndx, Elf_Half, SHN_UNDEF);
 		    }