libc++ vs. libstdc++ usage in the ports tree

[Tijl Coosemans]

On Tue, 03 Dec 2013 22:37:34 +0100 Jan Henrik Sylvester wrote:
> On 12/03/2013 21:54, Tijl Coosemans wrote:
>> On Tue, 03 Dec 2013 21:26:18 +0100 Jan Henrik Sylvester wrote:
>>> On 12/01/2013 15:06, Tijl Coosemans wrote:
>>>> The tests were successful:
>>>> https://redports.org/buildarchive/20131201105316-94935/ (octave)
>>>> https://redports.org/buildarchive/20131201115701-22333/ (octave-forge-base)
>>>> The octave logs also contain the results of running the regression-test
>>>> target.  The output is the same on all FreeBSD versions.
>>>>
>>>> The problem is that USE_FORTRAN=yes implies USE_GCC=yes.  This means
>>>> the C++ code in math/octave is compiled with gcc46/libstdc++ which
>>>> does not work if dependencies have been built with clang/libc++.
>>>>
>>>> The patch copies the USE_FORTRAN=yes logic from Mk/bsd.gcc.mk into a
>>>> new file Mk/Uses/fortran.mk.  It allows ports to use a Fortran compiler
>>>> together with the base system C/C++ compiler.
>>>
>>> With the patch, math/octave fails for me on 9.2-RELEASE/amd64 and
>>> 10.0-BETA4/amd64 with:
>>>
>>> checking for amd64-portbld-freebsd(9.2|10.0)-gfortran... f77
>>> checking whether we are using the GNU Fortran 77 compiler... no
>>> checking whether f77 accepts -g... no
>>> checking how to get verbose linking output from f77... configure:
>>> WARNING: compilation failed
>>>
>>> checking for Fortran 77 libraries of f77...
>>> checking for dummy main to link with Fortran 77 libraries... none
>>> checking for Fortran 77 name-mangling scheme... configure: error: in
>>> `/usr/ports/math/octave/work/octave-3.6.4':
>>> configure: error: cannot compile a simple Fortran program
>>>
>>> Full logs attached (each with and without your patch).
>>>
>>> In both cases, it tries to use f77, while the original port uses gfortran46.
>>>
>>> Any idea what is wrong on my system?
>> 
>> Do you define FC in make.conf maybe?
> 
> No, besides some options (*_SET / *_UNSET) for some unrelated ports, I
> only have got this in make.conf:

Hmm, apparently FC is defined by sys.mk.  I've attached a new patch.
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