library not found for -lgfortran

[Sean Farley]

Mark Brethen writes:

> Sent from my iPhone
>
>> On Jul 8, 2014, at 10:47 AM, Sean Farley <sean at macports.org> wrote:
>> 
>> 
>> Ryan Schmidt writes:
>> 
>>>> On Jul 8, 2014, at 7:34 AM, Mark Brethen wrote:
>>>> 
>>>>> On Jul 8, 2014, at 3:05 AM, Ryan Schmidt wrote:
>>>>> 
>>>>>> On Jul 7, 2014, at 11:28 PM, Mark Brethen wrote:
>>>>>> 
>>>>>> I was told that until a patch is submitted, I can just add -L/opt/local/lib/gcc48 to the LDFLAGS environment variable. So I put this in the portfile:
>>>>>> 
>>>>>> configure.ldflags-append "-L${prefix}/lib/gcc48"
>>>>>> 
>>>>>> I'm thinking that "gcc48" should be replaced by a variable, but what do I use?
>>>>> 
>>>>> MacPorts doesn't provide a variable suitable for that. If you have gcc variants, you could append to configure.ldflags in each variant, adjusting the path as needed for each gcc version.
>>>> 
>>>> I have:
>>>> 
>>>> compilers.choose        fc
>>>> compilers.setup         -dragonegg -g95 require_fortran
>>>> 
>>>> if {![fortran_variant_isset]} {
>>>>   default_variants-append +gcc48
>>>> }
>>>> 
>>>> configure.ldflags-append "-L${prefix}/lib/gcc48 -lgfortran"
>> 
>> This kind of information can only be reliably found out at configure
>> time. In other words, why isn't the FreeCAD project figuring this out
>> based on the fortran compiler with a configure test?
>> 
> They are aware that this needs to be patched. In the meantime they suggested setting it.

This is a big deal.

>>>> If the user has set a different version of gcc this won't work.
>>> 
>>> Oh, you don't create the compiler variants manually; you have the compilers portgroup do it for you. I'm not sure how the author of that portgroup intended for this situation to be handled. Maybe it does provide a variable for the currently–selected variant. Sean?
>> 
>> This situation smells awfully like something else is going on here. This
>> might mean that the linker should be FC instead of CC or CXX but that's
>> just a thought.
>
> I don't know. For now, maybe I should restrict it to gcc48 like so
>
> compilers.setup -dragonegg -g95 -gcc +gcc48 require_fortran

You probably want just +gfortran (which points to the latest one in macports)