Hello,
In the example of the patch below, we crash when trying to print the
alias of alias template instantiation 'Alias'. This is because
alias_template_specialization_p carelessly looks at
CLASSTYPE_TEMPLATE_INFO first, while TYPE_TEMPLATE_INFO is NULL in
this case.
Fixed thus, bootstrapped and tested on x86_64-unknown-linux-gnu
against trunk.
gcc/cp/
PR c++/51191 - ICE while printing alias of alias instantiation
* pt.c (alias_template_specialization_p): Don't crash on an alias
of template alias instantiation.
gcc/testsuite/
PR c++/51191 - ICE while printing alias of alias instantiation
* g++.dg/cpp0x/alias-decl-13.C: New test.
---
gcc/cp/pt.c | 3 ++-
gcc/testsuite/g++.dg/cpp0x/alias-decl-13.C | 24 ++++++++++++++++++++++++
2 files changed, 26 insertions(+), 1 deletions(-)
create mode 100644 gcc/testsuite/g++.dg/cpp0x/alias-decl-13.C
diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c
index 9738026..ac5d394 100644
--- a/gcc/cp/pt.c
+++ b/gcc/cp/pt.c
@@ -5310,7 +5310,8 @@ alias_template_specialization_p (tree t)
{
if (t == NULL_TREE)
return false;
- return (primary_template_instantiation_p (t)
+ return (TYPE_TEMPLATE_INFO (t)
+ && primary_template_instantiation_p (t)
&& DECL_ALIAS_TEMPLATE_P (TYPE_TI_TEMPLATE (t)));
}
diff --git a/gcc/testsuite/g++.dg/cpp0x/alias-decl-13.C
b/gcc/testsuite/g++.dg/cpp0x/alias-decl-13.C
new file mode 100644
index 0000000..8555154
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/alias-decl-13.C
@@ -0,0 +1,24 @@
+// Origin PR c++/51191
+// { dg-options "-std=c++0x" }
+
+template< class T >
+class ClassTemplate {};
+
+template< class T >
+struct Metafunction {
+ typedef T type;
+};
+
+template< class T >
+using TemplateAlias = ClassTemplate< typename Metafunction<T>::type >;
+
+using Alias = TemplateAlias<int>;
+
+template< class T >
+void f( TemplateAlias<T> );
+
+int main()
+{
+ Alias x;
+ f( x ); // { dg-error "no matching function for call to|f" }
+}
--
1.7.6.4
--
Dodji
