http://gcc.gnu.org/bugzilla/show_bug.cgi?id=61134
Bug ID: 61134
Summary: [4.7/4.8/4.9/4.10 Regression][C++11] bogus "no
matching function for call..."
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: ppluzhnikov at google dot com
Google ref: b/14657431
The test case compiles with Clang and gcc-4.6, fails with -DBUG on all later
versions including current trunk (r210292):
g++ -c -std=gnu++11 t.cc && echo OK && g++ -c -std=gnu++11 t.cc -DBUG
OK
t.cc: In function 'void Fn()':
t.cc:22:55: error: no matching function for call to 'CreateMetric(const char
[5], const char [4], Base)'
CreateMetric<int, const char*>("abcd", "def", Base());
^
t.cc:22:55: note: candidate is:
t.cc:15:6: note: template<class VT, class ... Fields> void CreateMetric(const
char*, typename Fixed<Fields>::name ..., const Base&)
void CreateMetric(const char* name,
^
t.cc:15:6: note: template argument deduction/substitution failed:
t.cc:22:55: note: cannot convert '"def"' (type 'const char [4]') to type
'const Base&'
CreateMetric<int, const char*>("abcd", "def", Base());
^
// --- cut ---
struct Base { };
template <typename>
struct Fixed {
typedef const char* name;
};
#if BUG
template <typename VT, typename... Fields>
void New(const char* name,
typename Fixed<Fields>::name... field_names);
#endif
template <typename VT, typename... Fields>
void CreateMetric(const char* name,
typename Fixed<Fields>::name... field_names,
const Base&) { }
void Fn()
{
CreateMetric<int, const char*>("abcd", "def", Base());
}
// --- cut ---
Note: The 'New()' function is not referenced outside the #ifdef block.
It's mere presense triggers the bug.
