Fails to Compile on GCC6

[SDNick484]

When trying to compile with GCC 6.1.0 on Gentoo, I run into the following error:

Scanning dependencies of target harmony
[ 20%] Building CXX object libharmony/CMakeFiles/harmony.dir/csocket.cpp.o
In file included from /usr/lib/gcc/x86_64-pc-linux-gnu/6.1.0/include/g++-v6/bits/basic_string.h:5402:0,
from /usr/lib/gcc/x86_64-pc-linux-gnu/6.1.0/include/g++-v6/string:52,
from /home/neandrad/harmony/libharmony/csocket.hpp:15,
from /home/neandrad/harmony/libharmony/csocket.cpp:1:
/usr/lib/gcc/x86_64-pc-linux-gnu/6.1.0/include/g++-v6/ext/string_conversions.h: In function ‘_Ret __gnu_cxx::__stoa(_TRet ()(const _CharT, _CharT**, _Base ...), const char*, const _CharT*, std::size_t*, _Base ...)’:
/usr/lib/gcc/x86_64-pc-linux-gnu/6.1.0/include/g++-v6/ext/string_conversions.h:72:25: error: ‘ERANGE’ was not declared in this scope
else if (errno == ERANGE
^~~~~~
make[2]: *** [libharmony/CMakeFiles/harmony.dir/build.make:63: libharmony/CMakeFiles/harmony.dir/csocket.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:86: libharmony/CMakeFiles/harmony.dir/all] Error 2

Not a major issue as compiling works fine with GCC 5.4.0, but just wanted to raise awareness in case you're interested in updating the code.

[yuri-sevatz]

Looks like #include is exploding.

I don't think this is anything specific to this library just because that header is supposed to have no external dependencies.

It may have something to do with CMake setting up the include path in a way that GCC 6.1 doesn't expect. I can't speak from experience there, though some googling seems to hint that this is probably closer to what's going on vs anything about including std::string.

(You can probably test that with a cmake sample "Hello World", and if that doesn't reproduce the issue, try linking Qt with CMake and seeing if the problem starts)