https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97860
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The problem is that in the C FE TYPE_MAX_VALUE (TYPE_DOMAIN (type)) isn't set
for the [0] types (yet they are complete), while the middle-end expects for
them to have TYPE_MAX_VALUE of -1 or so, so array_type_nelts returns
error_mark_node.
We could do:
/* array_type_nelts assumes the middle-end TYPE_DOMAINs, while
GNU [0] array in the FE don't have TYPE_MAX_VALUE of the
domain set, yet they are complete types with no elements. */
if (nelts == error_mark_node
&& TYPE_DOMAIN (type)
&& !TYPE_MAX_VALUE (TYPE_DOMAIN (type))
&& COMPLETE_P (type)
&& integer_zerop (TYPE_SIZE (type)))
continue;
but then it doesn't make sense to queue up error_mark_nodes in the attributes
when we ICE on them later, so perhaps better:
2020-11-18 Jakub Jelinek <ja...@redhat.com>
PR c/97860
* c-decl.c (get_parm_array_spec): Don't chain error_mark_node as
VLA bounds.
* gcc.dg/pr97860.c: New test.
--- gcc/c/c-decl.c.jj 2020-11-11 01:46:03.245697697 +0100
+++ gcc/c/c-decl.c 2020-11-18 15:11:14.613565216 +0100
@@ -5775,7 +5775,7 @@ get_parm_array_spec (const struct c_parm
type = TREE_TYPE (type))
{
tree nelts = array_type_nelts (type);
- if (TREE_CODE (nelts) != INTEGER_CST)
+ if (TREE_CODE (nelts) != INTEGER_CST && nelts != error_mark_node)
{
/* Each variable VLA bound is represented by the dollar
sign. */
--- gcc/testsuite/gcc.dg/pr97860.c.jj 2020-11-18 15:15:08.858931877 +0100
+++ gcc/testsuite/gcc.dg/pr97860.c 2020-11-18 15:14:50.751135430 +0100
@@ -0,0 +1,11 @@
+/* PR c/97860 */
+/* { dg-do compile } */
+/* { dg-options "" } */
+
+void
+foo (int n)
+{
+ typedef int T[0];
+ typedef T V[n];
+ void bar (V);
+}
