https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87822
--- Comment #13 from Jonathan Wakely <redi at gcc dot gnu.org> --- Created attachment 44936 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44936&action=edit Patch for GCC 6.5 Fixed in the gcc-7 and gcc-8 branches. This will not be fixed on gcc-6-branch, but for anybody who wants to apply it locally, the patch for GCC 6.5 is attached, and reproduced here: --- a/libstdc++-v3/include/bits/stl_pair.h +++ b/libstdc++-v3/include/bits/stl_pair.h @@ -187,7 +187,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION }; #endif // C++11 - class __pair_base + template<typename _U1, typename _U2> class __pair_base { #if __cplusplus >= 201103L template<typename _T1, typename _T2> friend struct pair; @@ -206,7 +206,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION */ template<typename _T1, typename _T2> struct pair - : private __pair_base + : private __pair_base<_T1, _T2> { typedef _T1 first_type; /// @c first_type is the first bound type typedef _T2 second_type; /// @c second_type is the second bound type
