On 16 December 2016 at 10:04, Edward Diener wrote: > I am testing gcc-6.2 with the -std=c++03 switch against some Boost C++ code > in a library which does not require c++11 on up support. Without going into > the exact code I am seeing a compiler error along the lines of: > > some_path/some_header_file.hpp:224:20: error: no matching function for call > to 'std::pair<int&, std::__cxx11::basic_string<char>&>::pair(int&, > std::__cxx11::basic_string<char>&)' > > This implies that even when the -std=c++03 switch with gcc-6.2 c++11 > constructs are being internally used. No it doesn't, see https://gcc.gnu.org/onlinedocs/libstdc++/manual/using_dual_abi.html Whether the __cxx11 ABI is used or not orthogonal to the -std option. It's controlled by a macro. If you compile with -D_GLIBCXX_USE_CXX11_ABI=0 you'll see the exact same error without the __cxx11 qualification. > Testing the exact same code with the > -std=c++11 switch or with the -std=c++14 switch there are no errors. Does > this mean that using gcc-6.2 with -std=c++03 does not work with gcc-6.2, or > is there something other compiler switch I must use along with the > -std=c++03 switch to be able to compile using gcc-6.2 in c++03 mode ? There is no other switch, -std=c++03 is all that's needed, and you're misinterpreting the error. I would guess that the code is using std::make_pair with an explicit template argument list, which changed meaning between C++03 and C++11, so the code is simply not compatible with C++03.
