PR middle-end/91679 - missing -Warray-bounds accessing a member array in a local buffer

PR middle-end/91679 - missing -Warray-bounds accessing a member array in a local buffer
PR middle-end/91647 - new FAILs for Warray-bounds-8 and Wstringop-overflow-3.C
PR middle-end/91463 - missing -Warray-bounds accessing past the end of a statically initialized flexible array member
PR middle-end/92312 - bogus -Wstringop-overflow storing into a trailing array backed by larger buffer

gcc/ChangeLog:

	PR middle-end/91679
	PR middle-end/91647
	PR middle-end/91463
	PR middle-end/92312
	* c-family/c-pretty-print.c (direct_abstract_declarator): Print
	bound in zero-length arrays.
	* gcc/c-family/c.opt (-Wzero-length-bounds): New option.
	* gcc/doc/invoke.texi (-Wzero-length-bounds): Document.
	* gimple-match-head.c (try_conditional_simplification): Use memcpy
	instead of a hand-rolled loop to avoid PR 92323.
	* tree-vrp.c (vrp_prop::check_array_ref): Handle trailing arrays
	with initializers.
	(vrp_prop::check_mem_ref): Handle declared struct objects.
	* tree.c (last_field): New function.
	(array_at_struct_end_p): Handle MEM_REF.
	(get_initializer_for): New helper.
	(component_ref_size): Add argument.  Rename locals.  Call
	get_initializer_for instead of fold_ctor_reference.  Correct handling
	of flexible array members.
	* wide-int.h (generic_wide_int <storage>::sign_mask): Assert invariant.

gcc/testsuite/ChangeLog:

	PR middle-end/91679
	PR middle-end/91647
	PR middle-end/91463
	PR middle-end/92312
	* c-c++-common/Warray-bounds-2.c: Disable VRP.  Adjust expected messages.
	* g++.dg/warn/Warray-bounds-8.C: Remove xfails.
	* gcc.dg/Warray-bounds-48.c: New test.
	* gcc.dg/Warray-bounds-49.c: New test.
	* gcc.dg/Wstringop-overflow-16.c: Adjust text of expected messages.
	* gcc.dg/Wstringop-overflow-21.c: New test.
	* gcc.dg/Wzero-length-array-bounds.c: New test.
	* gcc.dg/pr36902.c: Remove xfail.
	* gcc.dg/strlenopt-57.c: Add an expected warning.

From-SVN: r277728

1 files changed, 1 insertions, 1 deletions

diff --git a/gcc/tree.h b/gcc/tree.h
index 8135154..2ce001d 100644
--- a/gcc/tree.h
+++ b/gcc/tree.h
@@ -5262,7 +5262,7 @@ extern tree component_ref_field_offset (tree);
    of an initialized flexible array member.  The size might be zero for
    an object with an uninitialized flexible array member or null if it
    cannot be determined.  */
-extern tree component_ref_size (tree);
+extern tree component_ref_size (tree, bool * = NULL);
 
 extern int tree_map_base_eq (const void *, const void *);
 extern unsigned int tree_map_base_hash (const void *);