[PATCH] Initialize sanitizer builtins (PR sanitizer/60745)

[Marek Polacek]

Under certain circumstances the sanitizer builtins are not initialized
properly and ubsan_instrument_return must make sure they are
initialized.  Otherwise builtin_decl_explicit returns NULL and
we'll ICE in build_call_expr_loc_array.  I'm not sure which other
ubsan routines need similar fix.

No testcase attached since it's not trivial to reproduce this.

Bootstrapped/ran ubsan testsuite on x86_64-linux, ok for trunk?

2014-04-03  Marek Polacek  <polacek@redhat.com>

	PR sanitizer/60745
	* c-ubsan.c: Include asan.h.
	(ubsan_instrument_return): Call initialize_sanitizer_builtins.

diff --git gcc/c-family/c-ubsan.c gcc/c-family/c-ubsan.c
index dc4d981..9d2403c 100644
--- gcc/c-family/c-ubsan.c
+++ gcc/c-family/c-ubsan.c
@@ -29,6 +29,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "ubsan.h"
 #include "c-family/c-common.h"
 #include "c-family/c-ubsan.h"
+#include "asan.h"
 
 /* Instrument division by zero and INT_MIN / -1.  If not instrumenting,
    return NULL_TREE.  */
@@ -185,6 +186,8 @@ ubsan_instrument_vla (location_t loc, tree size)
 tree
 ubsan_instrument_return (location_t loc)
 {
+  initialize_sanitizer_builtins ();
+
   tree data = ubsan_create_data ("__ubsan_missing_return_data", &loc,
 				 NULL, NULL_TREE);
   tree t = builtin_decl_explicit (BUILT_IN_UBSAN_HANDLE_MISSING_RETURN);

	Marek