An attempt to fix c++/68449. We ICEd because pointer returned from
ctx->values->get points to NULL, so checking DECL_P on that is no no.
Fixed along the lines Jakub suggested in the PR.
Bootstrapped/regtested on x86_64-linux, ok for trunk?
2016-01-08 Marek Polacek <pola...@redhat.com>
PR c++/68449
* constexpr.c (cxx_eval_constant_expression): Handle NULL initializer.
* g++.dg/pr68449.C: New.
diff --git gcc/cp/constexpr.c gcc/cp/constexpr.c
index bcf26a6..f59d010 100644
--- gcc/cp/constexpr.c
+++ gcc/cp/constexpr.c
@@ -3195,7 +3195,7 @@ cxx_eval_constant_expression (const constexpr_ctx *ctx,
tree t,
if (VAR_P (r))
if (tree *p = ctx->values->get (r))
r = *p;
- if (DECL_P (r))
+ if (r == NULL_TREE || DECL_P (r))
{
if (!ctx->quiet)
non_const_var_error (r);
diff --git gcc/testsuite/g++.dg/pr68449.C gcc/testsuite/g++.dg/pr68449.C
index e69de29..7d86fe9 100644
--- gcc/testsuite/g++.dg/pr68449.C
+++ gcc/testsuite/g++.dg/pr68449.C
@@ -0,0 +1,9 @@
+// PR c++/68449
+// { dg-do compile }
+// { dg-options "-Wsign-compare" }
+
+int
+foo (int a)
+{
+ return __extension__ ({ int b; b; }) < 0;
+}
Marek
