No environment variable FC in OS X

[chvillanuevap]

I tried to build BLAS from source in OS X. I know I can use the Accelerate version, but I did this for testing purposes. I got the following error:

2015/04/30 18:33:38 - INFO: [package:run_job] -- The Fortran compiler identification is unknown
2015/04/30 18:33:38 - INFO: [package:run_job] CMake Error at CMakeLists.txt:2 (project):
2015/04/30 18:33:38 - INFO: [package:run_job]   No CMAKE_Fortran_COMPILER could be found.
2015/04/30 18:33:38 - INFO: [package:run_job]
2015/04/30 18:33:38 - INFO: [package:run_job]   Tell CMake where to find the compiler by setting either the environment
2015/04/30 18:33:38 - INFO: [package:run_job]   variable "FC" or the CMake cache entry CMAKE_Fortran_COMPILER to the full
2015/04/30 18:33:38 - INFO: [package:run_job]   path to the compiler, or to the compiler name if it is in the PATH.
2015/04/30 18:33:38 - INFO: [package:run_job]
2015/04/30 18:33:38 - INFO: [package:run_job]
2015/04/30 18:33:38 - INFO: [package:run_job] -- Configuring incomplete, errors occurred!
2015/04/30 18:33:38 - INFO: [package:run_job] See also "/Users/lindseybugbee/.hashdist/tmp/blas-lfhzsgupjjp6/CMakeFiles/CMakeOutput.log".
2015/04/30 18:33:38 - INFO: [package:run_job] See also "/Users/lindseybugbee/.hashdist/tmp/blas-lfhzsgupjjp6/CMakeFiles/CMakeError.log".
2015/04/30 18:33:38 - ERROR: [package:run_job] Command '[u'/bin/bash', '_hashdist/build.sh']' returned non-zero exit status 1
2015/04/30 18:33:38 - ERROR: [package:run_job] command failed (code=1); raising

It seems from the build log that OS X does not set the environment variable FC. This is troublesome not only for BLAS, but for any library that depends on gfortran.

I believe gfortran does not come bundled with XCode anymore; however, the package is available through Homebrew. I'm opening this issue because I do not know what is the best way to solve the dependency on gfortran. I could set FC to gfortran in the prologue but that would be a profile dependent fix.

[certik]

You have to set FC in your profile. After we fix hashdist/hashdist#328, setting compilers will become a bit easier, but one way or another, you need to have a working Fortran compiler to build these.

Now when #727 is fixed, we should use Hashdist to build the compiler, and then use it.