Hello,
after upgrading gcc one of my classes failed to compile. Stock
Debian/Wheezy 4.4, 4.5, 4.6 compiled the code, also compiled a version
of 4.7.0 that was built by me from sources some time ago. Clang 3.0-6
also compiled, but stock 4.7.1-7, the head of 4.7 (4.7.3 d51dc77f,
r192839) and the head of master (4.8.0 1a2798ac, r192875) didn't.
Reduced the code to a test case:
----8<----8<----8<----8<----8<----8<----8<----
class Id
{
public:
Id();
Id(char a, char b);
explicit Id(int v);
Id(const char* id_);
};
template<typename ID>
class Foo
{
public:
// typedef ID IdType;
void Bar(const ID& id_);
typedef ID IdType;
};
template<typename ID>
void Foo<ID>::Bar(const IdType& id_)
//void Foo<ID>::Bar(const ID& id_)
{
}
void foo()
{
Foo<Id> f;
f.Bar("hello");
}
----8<----8<----8<----8<----8<----8<----8<----
$ g++ -c gcctypedef.cpp
gcctypedef.cpp: In function ‘void foo()’:
gcctypedef.cpp:29:15: error: no matching function for call to
‘Foo<Id>::Bar(const char [6])’
gcctypedef.cpp:29:15: note: candidate is:
gcctypedef.cpp:21:6: note: void Foo<ID>::Bar(const IdType&) [with ID =
Id; Foo<ID>::IdType = Id]
gcctypedef.cpp:21:6: note: no known conversion for argument 1 from
‘const char [6]’ to ‘Id&’
4.8 gives the same error, but in prettier, more verbose format.
If the typedef in class Foo is _before_ the Bar fn declaration, gcc
compiles the code.
If instead of the typedef (IdType) the original type (ID) is used in the
argument of the Bar fn at the definition, gcc compiles the code.
I git bisect'd the commit that introduced the regression/bug:
commit 44f861fca343148a1b0720105ec2b7f14bbcc849
Author: jason <jason@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Wed Feb 8 09:52:11 2012 +0000
PR c++/52035
* pt.c (tsubst): Strip uninstantiated typedef.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@184000
138bc75d-0d04-0410-961f-82ee72b054a4
I didn't find anything relevant in Bugzilla when searching for 'typedef
template'. Should I file a bug report?
Kind regards, Peter
