The following makes sure that the gimplifier properly unshares the
type fields in anonymous VLA types by inserting a DECL_EXPR for
it instead of just forcing a TYPE_SIZE evaluation.
This avoids turning those fields in to garbage during gimplification.
Bootstrapped and tested on x86_64-unknown-linux-gnu.
Ok for trunk?
This fixes an ICE with c-c++-common/ubsan/pr59667.c when the gimplfier
is allowed to introduce SSA names.
Richard.
2016-04-29 Richard Biener <rguent...@suse.de>
cp/
* decl.c (grokdeclarator): Properly insert a DECL_EXPR for
anonymous VLAs.
Index: gcc/cp/decl.c
===================================================================
*** gcc/cp/decl.c.orig 2016-04-28 14:11:00.044581227 +0200
--- gcc/cp/decl.c 2016-04-28 14:11:08.116671106 +0200
*************** grokdeclarator (const cp_declarator *dec
*** 10393,10400 ****
&& (decl_context == NORMAL || decl_context == FIELD)
&& at_function_scope_p ()
&& variably_modified_type_p (type, NULL_TREE))
! /* Force evaluation of the SAVE_EXPR. */
! finish_expr_stmt (TYPE_SIZE (type));
if (declarator->kind == cdk_reference)
{
--- 10393,10403 ----
&& (decl_context == NORMAL || decl_context == FIELD)
&& at_function_scope_p ()
&& variably_modified_type_p (type, NULL_TREE))
! {
! TYPE_NAME (type) = build_decl (UNKNOWN_LOCATION, TYPE_DECL,
! NULL_TREE, type);
! add_decl_expr (TYPE_NAME (type));
! }
if (declarator->kind == cdk_reference)
{
