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C++ PATCH for c++/63849 (mangling crash with alias template)
- From: Jason Merrill <jason at redhat dot com>
- To: gcc-patches List <gcc-patches at gcc dot gnu dot org>
- Date: Fri, 21 Nov 2014 16:32:47 -0500
- Subject: C++ PATCH for c++/63849 (mangling crash with alias template)
- Authentication-results: sourceware.org; auth=none
An alias or typedef to a template type parameter is not itself a
template type parameter.
Tested x86_64-pc-linux-gnu, applying to trunk and 4.9.
commit 89ffb512bb8120b0e4bd919a941c44876a6a8ce3
Author: Jason Merrill <jason@redhat.com>
Date: Fri Nov 21 13:55:11 2014 -0500
PR c++/63849
* mangle.c (decl_mangling_context): Use template_type_parameter_p.
diff --git a/gcc/cp/mangle.c b/gcc/cp/mangle.c
index 4c63df0..9f0d9d8 100644
--- a/gcc/cp/mangle.c
+++ b/gcc/cp/mangle.c
@@ -764,8 +764,7 @@ decl_mangling_context (tree decl)
if (extra)
return extra;
}
- else if (TREE_CODE (decl) == TYPE_DECL
- && TREE_CODE (TREE_TYPE (decl)) == TEMPLATE_TYPE_PARM)
+ else if (template_type_parameter_p (decl))
/* template type parms have no mangling context. */
return NULL_TREE;
return CP_DECL_CONTEXT (decl);
diff --git a/gcc/testsuite/g++.dg/cpp0x/alias-decl-44.C b/gcc/testsuite/g++.dg/cpp0x/alias-decl-44.C
new file mode 100644
index 0000000..bd20b54
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/alias-decl-44.C
@@ -0,0 +1,43 @@
+// PR c++/63849
+// { dg-do compile { target c++11 } }
+
+template <class _T, class...>
+using First = _T; // we should not use this
+ // alias with only
+ // one pack parameter (?)
+
+template <template <class...> class _Successor,
+ int,
+ class... _Xs>
+struct Overlay
+{
+ using O = _Successor<_Xs...>;
+};
+
+template <class... _Pack>
+struct List
+{
+ template <int _s>
+ using O = typename Overlay<List, _s, _Pack...>::O;
+
+ template <template <class...> class _S>
+ using Pass = _S<_Pack...>;
+
+ template <int _i>
+ using At = typename O<_i>
+ ::template Pass<First>;
+};
+
+template <int _i>
+using At = typename List<int, char>
+::template At<_i>;
+
+template <int _i>
+void func_crash(At<_i>&) {}
+
+int main(int argc, char *argv[])
+{
+ char ccc;
+ int iii;
+ func_crash<0>(iii);
+}