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C++ PATCH for c++/55842 (ICE with noexcept and __has_nothrow_constructor)
- From: Jason Merrill <jason at redhat dot com>
- To: gcc-patches List <gcc-patches at gcc dot gnu dot org>
- Date: Thu, 03 Jan 2013 15:34:42 -0500
- Subject: C++ PATCH for c++/55842 (ICE with noexcept and __has_nothrow_constructor)
We need to instantiate a deferred noexcept when evaluationg
__has_nothrow_constructor.
Tested x86_64-pc-linux-gnu, applying to trunk and 4.7.
commit 2b440f24a3319736c477523f65af741f97068ab6
Author: Jason Merrill <jason@redhat.com>
Date: Thu Jan 3 14:38:54 2013 -0500
PR c++/55842
* semantics.c (trait_expr_value): Call maybe_instantiate_noexcept.
diff --git a/gcc/cp/semantics.c b/gcc/cp/semantics.c
index 9f8119f..2e02295 100644
--- a/gcc/cp/semantics.c
+++ b/gcc/cp/semantics.c
@@ -5454,7 +5454,8 @@ trait_expr_value (cp_trait_kind kind, tree type1, tree type2)
return (trait_expr_value (CPTK_HAS_TRIVIAL_CONSTRUCTOR, type1, type2)
|| (CLASS_TYPE_P (type1)
&& (t = locate_ctor (type1))
- && TYPE_NOTHROW_P (TREE_TYPE (t))));
+ && (maybe_instantiate_noexcept (t),
+ TYPE_NOTHROW_P (TREE_TYPE (t)))));
case CPTK_HAS_TRIVIAL_CONSTRUCTOR:
type1 = strip_array_types (type1);
diff --git a/gcc/testsuite/g++.dg/ext/has_nothrow_constructor-2.C b/gcc/testsuite/g++.dg/ext/has_nothrow_constructor-2.C
new file mode 100644
index 0000000..9191c3e
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ext/has_nothrow_constructor-2.C
@@ -0,0 +1,7 @@
+// PR c++/55842
+// { dg-options -std=c++11 }
+
+template <class=void> struct number {
+ number() noexcept(noexcept(0)) { }
+};
+const int z=__has_nothrow_constructor(number<>);