CFITSIO's Fortran interface

[Ryan Schmidt]

> On Feb 15, 2016, at 2:07 AM, Sébastien Maret <sebastien.maret at icloud.com> wrote:
> 
>> 
>> Le 11 févr. 2016 à 16:19, Ryan Schmidt <ryandesign at macports.org> a écrit :
>> 
>> On Feb 11, 2016, at 2:00 AM, Sébastien Maret wrote:
>>> 
>>>> Le 10 févr. 2016 à 16:23, Ryan Schmidt <ryandesign at macports.org> a écrit :
>>>> 
>>>> On Feb 10, 2016, at 8:52 AM, Sébastien Maret wrote:
>>>> 
>>>>> I am maintaining the Gildas port which depends on the CFITSIO library. CFITSIO has a Fortran interface but it is not built by default: one need to select a specific variant (e.g. +gcc 5) for this. This is a problem for the Gildas because the compilation fails without the Fortran interface:
>>>>> https://trac.macports.org/ticket/50543
>>>>> 
>>>>> Is there a way for a port to depend on a specific variant of another port? If not then how can I solve this?
>>>> 
>>>> The require_active_variants procedure in the active_variants 1.1 port group.
>>> 
>>> Thanks. I’ve added the cfitsio +gcc5 in require_active_variants and this solves the problem on Yosemite:
>>> https://trac.macports.org/changeset/145605
>>> 
>>> However the compilation fails on older MacOS versions because the +gcc5 variant is not available.
>> 
>> Why isn't the gcc5 variant available on older Mac OS versions?
> 
> I don’t know. The build bot log for Mountain Lion says:
> 
> DEBUG: cfitsio is installed with the following variants: 
> DEBUG:   required: gcc5, forbidden: 
> DEBUG:   rejected, because required variant gcc5 is missing
> Error: org.macports.configure for port gildas returned: cfitsio must be installed with +gcc5.
> 
> https://build.macports.org/builders/buildports-mtln-x86_64/builds/27804/steps/compile/logs/stdio/text
> 
> so I thought that the cfitsio +gcc5 variant was missing on that platform. But perhaps I misunderstand the build bot log?

I think you misunderstand. This message is generated by the active_variants 1.1 portgroup. It means that gildas requires the cfitsio port to be installed with the +gcc5 variant, but the user (in this case, the buildbot) did not do that (in this case, because it is not a default variant, and the buildbot only builds default variants). So, nothing about this situation should really be OS X-version-specific.