[CMake] Testing with multiple Fortran compilers

Fri Apr 13 03:02:31 EDT 2018

Hi William,

The compiler is not determined via this line - that merely retrieves the name component from the full path to the actual compiler executable. CMake uses a number of methods, if I may express it that way, to determine which compiler (Fortran or otherwise to use). One of them is the FC environment variable. If that is not set, it searches through a list of possible compiler commands.

As for CMakeCache.txt and the like: it is best to start a build in a clean directory. Left-overs from a previous build may confuse the configuration and actual building of the program or programs.

(As for get_file_component: In the PLplot project the PATH part of the full path to the compiler is used to fine-tune the directories where the compiler libraries are to be found.)

Regards,

Arjen

Arjen Markus
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> -----Original Message-----
> From: CMake [mailto:cmake-bounces at cmake.org] On Behalf Of William Clodius
> Sent: Friday, April 13, 2018 4:34 AM
> To: cmake at cmake.org
> Subject: [CMake] Testing with multiple Fortran compilers
>
> I have been using CMake with gfortran for a number of years, and now want test
> my code with ifort. I want to switch easily switch between compilers. My
> CMakeLists.txt file is based on the fortran example from make.org an appears to
> have most of the infrastructure needed, but I don't understand how the line
>
> get_filename_component (Fortran_COMPILER_NAME
> ${CMAKE_Fortran_COMPILER} NAME)
>
> determines the Fortran compiler to be used. Does it examine the FC system
> variable? Does it require the full pathname to the compiler executable? Do I have to
> delete the CMakeCache.txt, Makefile, and cmake_install.cmake each time I change
> compilers?
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