re PR lto/81968 (early lto debug objects make Solaris ld SEGV)

2017-09-15  Richard Biener  <rguenther@suse.de>

	PR lto/81968
	* simple-object-elf.c (simple_object_elf_copy_lto_debug_sections):
	Iterate marking dependent sections necessary.

From-SVN: r252807

libiberty/ChangeLog

+2017-09-15  Richard Biener  <rguenther@suse.de>
+
+	PR lto/81968
+	* simple-object-elf.c (simple_object_elf_copy_lto_debug_sections):
+	Iterate marking dependent sections necessary.
+
 2017-09-15  Nathan Sidwell  <nathan@acm.org>
 
 	* cp-demangle.c (is_fnqual_component_type): Reimplement using

libiberty/simple-object-elf.c

@@ -1158,6 +1158,10 @@ simple_object_elf_copy_lto_debug_sections (simple_object_read *sobj,
 
   /* Mark sections as preserved that are required by to be preserved
      sections.  */
+  int changed;
+  do
+    {
+      changed = 0;
       for (i = 1; i < shnum; ++i)
 	{
 	  unsigned char *shdr;
@@ -1175,8 +1179,9 @@ simple_object_elf_copy_lto_debug_sections (simple_object_read *sobj,
 	  if (sh_type == SHT_GROUP)
 	    {
 	      /* Mark groups containing copied sections.  */
-	  unsigned entsize = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
-					      shdr, sh_entsize, Elf_Addr);
+	      unsigned entsize = ELF_FETCH_FIELD (type_functions, ei_class,
+						  Shdr, shdr, sh_entsize,
+						  Elf_Addr);
 	      unsigned char *ent, *buf;
 	      int keep = 0;
 	      offset = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
@@ -1201,6 +1206,8 @@ simple_object_elf_copy_lto_debug_sections (simple_object_read *sobj,
 		}
 	      if (keep)
 		{
+		  changed |= (pfnret[sh_link - 1] == -1
+			      || pfnret[i - 1] == -1);
 		  pfnret[sh_link - 1] = 0;
 		  pfnret[i - 1] = 0;
 		}
@@ -1211,6 +1218,8 @@ simple_object_elf_copy_lto_debug_sections (simple_object_read *sobj,
 	      /* Mark relocation sections and symtab of copied sections.  */
 	      if (pfnret[sh_info - 1] == 0)
 		{
+		  changed |= (pfnret[sh_link - 1] == -1
+			      || pfnret[i - 1] == -1);
 		  pfnret[sh_link - 1] = 0;
 		  pfnret[i - 1] = 0;
 		}
@@ -1219,9 +1228,14 @@ simple_object_elf_copy_lto_debug_sections (simple_object_read *sobj,
 	    {
 	      /* Mark strings sections of copied symtabs.  */
 	      if (pfnret[i - 1] == 0)
+		{
+		  changed |= pfnret[sh_link - 1] == -1;
 		  pfnret[sh_link - 1] = 0;
 		}
 	    }
+	}
+    }
+  while (changed);
 
   /* Then perform the actual copying.  */
   for (i = 1; i < shnum; ++i)