http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58030
Bug ID: 58030
Summary: Mismatched tags in std::hash friends
Product: gcc
Version: 4.8.1
Status: UNCONFIRMED
Severity: minor
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: bluescarni at gmail dot com
I am testing out clang in conjunction with GCC 4.8.1's libstdc++ in c++11 mode.
I routinely get these warnings when compiling with -Wall and -Wextra:
---
/home/yardbird/repos/piranha/src/rational.hpp:1753:1: warning: 'hash' defined
as a struct template here but previously declared as
a class template [-Wmismatched-tags]
struct hash<piranha::rational>
^
/usr/lib/gcc/x86_64-redhat-linux/4.8.1/../../../../include/c++/4.8.1/bits/stl_bvector.h:523:31:
note: did you mean struct here?
template<typename> friend class hash;
^
/usr/lib/gcc/x86_64-redhat-linux/4.8.1/../../../../include/c++/4.8.1/bitset:763:33:
note: did you mean struct here?
template<typename> friend class hash;
^
/usr/lib/gcc/x86_64-redhat-linux/4.8.1/../../../../include/c++/4.8.1/bits/stl_bvector.h:523:31:
note: did you mean struct here?
template<typename> friend class hash;
^
---
Indeed, these friendship declarations in bitset and stl_bvector.h use 'class'
instead of 'struct' when referring to std::hash. It is my understanding that
this behaviour does not constitute a violation of the standard... still it irks
my compiler warnings OCD :)
Any chance this could be fixed sometimes?
