Parallel compilation of MRCC using CMake

Dear developers,

I tried to compile MRCC using build.mrcc script, unfortunately, this script compiles MRCC in single-thread mode. So, compilation takes time.

Then, I decided to use CMake for the build automatization of MRCC. Initially, I moved all source files (*.f, *.f90, *.F90) into the `source/` directory. Using this directory structure, I have written CMakeLists.txt for CMake. Currently, it has some limitations:

• Only dynamic builds (no static)
• Only OpenMPI is supported (I would prefer to modify the source code rather than the build system in this case)
• No HDF5 and Q5cost libraries (I have no idea where I can get Q5cost lib)
• GCC and Intel compilers are supported (I tested armflang also, but I got internal compiler error)

A new build system natively supports file separation into several ones. For this, the user should create a directory as the name of the file for separation without its extension, then, separate the file into multiple ones in the created directory. 
For example, for `intsub.f `, the user should 

• create `intsub` directory inside of `source/`
• move `intsub.f` into `intsub`
• split `intsub.f` into multiple files by routines (for example, using f90split)
• remove `intsub.f`

I did it for `intsub.f` and `intsub_rangesep.f`, then, the compilation times of these files were reduced significantly.

The structure of MRCC project after patching is presented in `tree` file in the attachment. `patch.diff` contains diff after moving source files into `source/` directory.

 
 

Best regards,
Igor

A proper build system would indeed be highly useful, since this would allow for parallel compiles, for example.

Great Job