USES=compiler:c++11-lib on FreeBSD 8.4

[Geoff Speicher]

On Tue, Apr 29, 2014 at 4:08 AM, Tijl Coosemans <tijl at freebsd.org> wrote:

> On Mon, 28 Apr 2014 22:38:55 -0400 Geoff Speicher wrote:
> > Not sure if ports is the right place for this post so apologies in
> advance
> > if I'm not in the right place.
> >
> > I'm porting an application that requires c++11, and I'm trying to create
> > the port on a FreeBSD 8.4 box. From everything I have read, it appears
> that
> > c++11 is only supported in 9.1+ when world has been built with the c++11
> > toolchain. However, the various ports switches such as
> > USES=compiler:c++11-lib don't yield any warnings on 8.4, yet don't seem
> to
> > work either. Can anyone comment on whether or not this option is supposed
> > to work on 8.4?
> >
> > Taking ports out of the equation for a moment, I can't compile the
> > following c++11 file:
> >
> > // test.cpp
> > #include <type_traits>
> > #include <string>
> >
> > int main() {
> >   int number = 10;
> >   std::string value;
> >   value = std::to_string(number);
> > }
> > // EOF
> >
> > clang++33 fails on a new c++11 include file:
> >
> > $ clang++33 -std=c++11 test.cpp
> > test.cpp:1:10: fatal error: 'type_traits' file not found
> > #include <type_traits>
> >          ^
> > 1 error generated.
> >
> >
> > g++47 at least finds the include file but doesn't appear to define
> > std::to_string as it should:
> >
> > $ g++47 -std=c++11 test.cpp
> > test.cpp: In function 'int main()':
> > test.cpp:7:11: error: 'to_string' is not a member of 'std'
> >
> > I also tried installing devel/libc++ and that fails trying to include
> > xlocale.h, which only appears to exist in 9.1 and later. Am I missing
> > something here or is c++11 simply not supported on 8.4? Assuming the
> > latter, is there a way to automatically make ports fail with a meaningful
> > error message on <9.0 when attempting to use c++11-lang or c++11-lib?
>
> On 8.x one of the gcc ports has to be used if you need a c++11 library,
> but it appears that the declarations of to_string in bits/basic_string.h
> are hidden behind #ifdef _GLIBCXX_USE_C99 and that macro isn't defined
> on FreeBSD because we are missing a few obscure c99 functions.
> I think it would be best to patch the gcc ports to force the definition
> of that macro.
>

Thanks for responding. In the meantime, I'll just hack that flag into
CXXFLAGS for this port unless you have any other suggestions.