[CMake] [CMake ] Specify linker for a mixed language Fortran/C++ application (linux)

[Raphael Münster]

Hello,

I ran into some trouble trying to link a mixed language Fortran/C++ 
program.
I used a CMakeLists.txt that looks about like this:

# cmake version
cmake_minimum_required(VERSION 2.8)

# name of the project
PROJECT(Q2P1)

enable_language (Fortran)

set(CMAKE_Fortran_COMPILER "mpif90")

# add subdirectories
ADD_SUBDIRECTORY(CPLUSPLUS)

SET(src_fortran ...)

ADD_EXECUTABLE(Q2P1 ${src_fortran})

target_link_libraries(Q2P1 CPLUSPLUSLibrary)


I invoke cmake like this "CC=mpicc CXX=mpic++ cmake 
-DCMAKE_Fortran_COMPILER=mpif90"
and a working Makefile is produced, the code compiles with no error and 
the CPLUSPLUSLibrary is created.
The linking process exits with an error /usr/lib/../lib64/crt1.o: In 
function `_start': 
/usr/src/packages/BUILD/glibc-2.9/csu/../sysdeps/x86_64/elf/start.S:109: 
undefined reference to `main'
This happens because mpic++ is used to link, but the main program is 
actually in the Fortran code. So the linking command looks about like 
this mpic++ (list of object files) -o executable
The problem is solved when I just manually copy and paste the link 
command that is printed on the command line and replace mpic++ with 
mpif90... So the question is how can I tell
cmake to use mpif90 to link the program? I tried setting CMAKE_LINKER to 
mpif90, but that did not change anything...

Thanks,
Raphael










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