How can I remove '-arch x86_64' during configure

[Joshua Root]

On 2011-3-16 01:49 , Konis Kjell wrote:
> Hello,
> 
> R port maintainer here. I am trying to build the R port using the
> compilers in the llvm-gcc42 port (since I believe this is the only set of
> compilers that includes Fortran and is compatible with Xcode). If I run
> ./configure by hand everything works, e.g.
> 
> 
>   CFLAGS=-I/MacPorts/include \
>   LDFLAGS=-L/MacPorts/lib \
>   CC=/MacPorts/bin/llvm-gcc-4.2 \
>   CXX=/MacPorts/bin/llvm-g++-4.2 \
>   OBJC=/MacPorts/bin/llvm-gcc-4.2 \
>   F77=/MacPorts/bin/llvm-gfortran-4.2 \
>   FC=/MacPorts/bin/llvm-gfortran-4.2 \
>   ./configure --prefix=/u/smat/konis/Desktop/R-2.12.2
> --without-recommended-packages
> 
> 
>   make
>   make install
> 
> 
> does what I want. However, when I set this up in MacPorts, '-arch x86_64'
> gets added to the arguments passed to the C and Fortran compilers and
> -arch is not supported by llvm-gcc-4.2. How can I remove the '-arch
> x86_64' during the configure phase?

Normally in this sort of situation you should set configure.compiler.
This not only sets up configure.cc, configure.cxx and so forth for you,
but it also sets configure.cc_archflags, which is where the -arch x86_64
is coming from, to something the selected compiler suite will understand.

However, configure.compiler macports-llvm-gcc-4.2 is only in trunk at
the moment. So you need to DIY. Easiest way is probably to set
'configure.compiler macports-gcc-4.2' or something, then set
configure.{cc,cxx,...} to the right values.

There will never be -arch in FFLAGS, F90FLAGS or FCFLAGS BTW. If they
end up being passed to the fortran compiler it must be the build system
incorrectly using CFLAGS or something.

- Josh