CMake Fortran Issues

Introduction

CMake has a number of Fortran issues that have been discussed many different times on list and duplicated a fair number of times in the bug tracker as well.

Maik Beckmann is trying to make sense of all the confusion by collecting information on all Fortran issues at http://www.cmake.org/Bug/view.php?id=5809

Please join the work there by

• Contributing patches.
• Testing the patches that already exist there.
• Reporting things that don't work.
• Sending simplified examples of things which don't work.
• Sharing your expert knowledge of CMake.

Concepts expressed using Makefiles

This section is intended to discuss the makefile rules which CMake has to generate have to look like.

A simple program

A f9x program which is build by compiling in linking two source files a.f90 and main.f90. The tree structure is:

• example_simpleProgram
  • build
    • Makefile
    • prog.dir
      • build.make
  • main.f90
  • a.f90

a.f90:

SUBROUTINE printHello
	write(*,*) "Hello f9x world"	
END SUBROUTINE

main.f90:

PROGRAM hello 
    CALL printHello
END PROGRAM

Makefile:

all: prog.dir/all

prog.dir/all:
	$(MAKE) -f prog.dir/build.make prog.dir/all

clean:
	$(MAKE) -f prog.dir/build.make prog.dir/clean

build.make:

prog.dir/all: prog.dir/prog

prog.dir/prog:  prog.dir/a.o prog.dir/main.o
	gfortran -o prog.dir/prog  prog.dir/a.o prog.dir/main.o
	
prog.dir/a.o: ../a.f90
	gfortran -o prog.dir/a.o  -c ../a.f90
	
prog.dir/main.o: ../main.f90 
	gfortran -o prog.dir/main.o  -c ../main.f90 
	
prog.dir/clean:
	rm prog.dir/a.o prog.dir/main.o prog.dir/prog

The current CMake is able to do this without any problems. You can download this example as tarball example_simpleProgram.tar.gz at http://www.cmake.org/Bug/view.php?id=5809