Hello, unlike fortran program files which can be compiled using the command 'gfortran' (in addition to 'gcc'), there is no other command for Objective-C program files, and run 'gcc -c x.m' using the 'gcc' package will just complain "Objective-C compiler not installed on this system" due to it lacking objc support.
I have to revert commit 82f145ef7a to get a objc enabled 'gcc' in the 'gcc-objc' package. IIUC, the purpose of that commit is to avoid file collisions between 'gfortran' and the 'gcc' package used in the 'gnu-build-system', which will broke the compiler in some way. So I think we really want to only have one gcc package in an environment... How about enable all languages (except 'brig' which I never heard of) for the gcc-final and the 'gcc' (in gcc.scm) packages? In this way, I think 'gnu-build-system' and 'gcc-toolchain' will able to compile Fortran, Objective-C, Go, etc. out of the box.
