re PR lto/91307 (-flto causes binary to vary)

2019-08-20  Richard Biener  <rguenther@suse.de>

	PR lto/91307
	* ipa.c (cgraph_build_static_cdtor_1): Use names not recognizable
	by collect2 when targetm.have_ctors_dtors which avoids dragging
	in temporary filenames from LTO input objects.

From-SVN: r274748

gcc/ChangeLog

 2019-08-20  Richard Biener  <rguenther@suse.de>
 
+	PR lto/91307
+	* ipa.c (cgraph_build_static_cdtor_1): Use names not recognizable
+	by collect2 when targetm.have_ctors_dtors which avoids dragging
+	in temporary filenames from LTO input objects.
+
+2019-08-20  Richard Biener  <rguenther@suse.de>
+
 	PR tree-optimization/37242
 	* tree-ssa-sccvn.c (visit_nary_op): Also CSE (T)(a + b)
 	to (T)a + (T)b if we know that a + b does not overflow.

gcc/ipa.c

@@ -836,13 +836,18 @@ cgraph_build_static_cdtor_1 (char which, tree body, int priority, bool final,
   /* The priority is encoded in the constructor or destructor name.
      collect2 will sort the names and arrange that they are called at
      program startup.  */
-  if (final)
+  if (!targetm.have_ctors_dtors && final)
+    {
       sprintf (which_buf, "%c_%.5d_%d", which, priority, counter++);
+      name = get_file_function_name (which_buf);
+    }
   else
+    {
       /* Proudce sane name but one not recognizable by collect2, just for the
 	 case we fail to inline the function.  */
-    sprintf (which_buf, "sub_%c_%.5d_%d", which, priority, counter++);
-  name = get_file_function_name (which_buf);
+      sprintf (which_buf, "_sub_%c_%.5d_%d", which, priority, counter++);
+      name = get_identifier (which_buf);
+    }
 
   decl = build_decl (input_location, FUNCTION_DECL, name,
 		     build_function_type_list (void_type_node, NULL_TREE));