smartmontools: requires C++11

[mojca (Mojca Miklavec)]

Smartmontools does not compile on older systems due to lack of some C++11 functionality.

On 10.5 PPC using configure.compiler=macports-gcc-6 helped to build the port successfully.

[RJVB (René Bertin)]

Yes, using a recent GCC should work with most software.

[mojca (Mojca Miklavec)]

This need to be fixed in Portfile though.

[RJVB (René Bertin)]

That's already the case in my own copy, which I recall doing on request (and uploading, here I think):

platform darwin {
    if {${configure.cxx_stdlib} eq "libstdc++"} {
        configure.args-append \
                    --with-cxx11-option=no
    }
}

(IOW, older systems using libstdc++ will not use C++11, which is of course the preferred solution as long as the project provides the option.)

[ryandesign (Ryan Carsten Schmidt)]

Replying to RJVB:

That's already the case in my own copy, which I recall doing on request (and uploading, here I think):

Yes, in #55730.