re PR sanitizer/84307 (asan blocks dead-store elimination)

	PR sanitizer/84307
	* c-decl.c (build_compound_literal): Call pushdecl (decl) even when
	it is not TREE_STATIC.
	* c-typeck.c (c_mark_addressable) <case COMPOUND_LITERAL_EXPR>: Mark
	not just the COMPOUND_LITERAL_EXPR node itself addressable, but also
	its COMPOUND_LITERAL_EXPR_DECL.

From-SVN: r259641

gcc/c/ChangeLog

+2018-04-25  Jakub Jelinek  <jakub@redhat.com>
+
+	PR sanitizer/84307
+	* c-decl.c (build_compound_literal): Call pushdecl (decl) even when
+	it is not TREE_STATIC.
+	* c-typeck.c (c_mark_addressable) <case COMPOUND_LITERAL_EXPR>: Mark
+	not just the COMPOUND_LITERAL_EXPR node itself addressable, but also
+	its COMPOUND_LITERAL_EXPR_DECL.
+
 2018-03-21  Joseph Myers  <joseph@codesourcery.com>
 
 	* c-parser.c (c_parser_postfix_expression): For __builtin_tgmath

gcc/c/c-decl.c

@@ -5348,6 +5348,8 @@ build_compound_literal (location_t loc, tree type, tree init, bool non_const,
       pushdecl (decl);
       rest_of_decl_compilation (decl, 1, 0);
     }
+  else
+    pushdecl (decl);
 
   if (non_const)
     {

gcc/c/c-typeck.c

@@ -4821,6 +4821,10 @@ c_mark_addressable (tree exp, bool array_ref_p)
 	break;
 
       case COMPOUND_LITERAL_EXPR:
+	TREE_ADDRESSABLE (x) = 1;
+	TREE_ADDRESSABLE (COMPOUND_LITERAL_EXPR_DECL (x)) = 1;
+	return true;
+
       case CONSTRUCTOR:
 	TREE_ADDRESSABLE (x) = 1;
 	return true;