The switch to using build_value_init for value-initialization of
non-class types caused us to incorrectly allow functional casts to array
type, leading to an ICE.
Tested x86_64-pc-linux-gnu, applied to trunk.
commit 4c4d50b6852b51cd6a227a09f330a086eb3b1d63
Author: Jason Merrill <ja...@redhat.com>
Date: Sat Apr 16 17:34:10 2011 -0700
PR c++/48531
* typeck2.c (build_functional_cast): Disallow array type.
diff --git a/gcc/cp/init.c b/gcc/cp/init.c
index fad7f0c..3280d9b 100644
--- a/gcc/cp/init.c
+++ b/gcc/cp/init.c
@@ -369,6 +369,8 @@ build_value_init (tree type, tsubst_flags_t complain)
tree
build_value_init_noctor (tree type, tsubst_flags_t complain)
{
+ /* FIXME the class and array cases should just use digest_init once it is
+ SFINAE-enabled. */
if (CLASS_TYPE_P (type))
{
gcc_assert (!TYPE_NEEDS_CONSTRUCTING (type));
@@ -450,7 +452,9 @@ build_value_init_noctor (tree type, tsubst_flags_t complain)
if (ce->value == error_mark_node)
return error_mark_node;
- /* The gimplifier can't deal with a RANGE_EXPR of TARGET_EXPRs. */
+ /* We shouldn't have gotten here for anything that would need
+ non-trivial initialization, and gimplify_init_ctor_preeval
+ would need to be fixed to allow it. */
gcc_assert (TREE_CODE (ce->value) != TARGET_EXPR
&& TREE_CODE (ce->value) != AGGR_INIT_EXPR);
}
diff --git a/gcc/cp/typeck2.c b/gcc/cp/typeck2.c
index 20b47d5..f0b67f7 100644
--- a/gcc/cp/typeck2.c
+++ b/gcc/cp/typeck2.c
@@ -1534,6 +1534,15 @@ build_functional_cast (tree exp, tree parms,
tsubst_flags_t complain)
else
type = exp;
+ /* We need to check this explicitly, since value-initialization of
+ arrays is allowed in other situations. */
+ if (TREE_CODE (type) == ARRAY_TYPE)
+ {
+ if (complain & tf_error)
+ error ("functional cast to array type %qT", type);
+ return error_mark_node;
+ }
+
if (processing_template_decl)
{
tree t;
diff --git a/gcc/testsuite/g++.dg/cpp0x/sfinae16.C
b/gcc/testsuite/g++.dg/cpp0x/sfinae16.C
new file mode 100644
index 0000000..6470567
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/sfinae16.C
@@ -0,0 +1,17 @@
+// PR c++/48531
+// { dg-options -std=c++0x }
+
+template<class T,
+ class = decltype(T())
+>
+char f(int);
+
+template<class>
+double f(...);
+
+struct B2 {
+ B2(...);
+};
+
+#define SA(X) static_assert ((X), #X);
+SA(sizeof(f<B2[2]>(0)) != 1);
