[CMake] linking main Fortran and C++

[Michael Hertling]

On 10/19/2010 03:43 AM, Michael Scot Breitenfeld wrote:
>       My main program is in Fortran and I have couple of
>       files that are in C++. When I try to make the library,
>       CMake uses CXX linking (archiving) to make the library.
> 
>       Which I guess is ok, but then when it links the main program it
>       thinks that it is a CXX executable and uses the C++ compiler and
>       not the Fortran compiler so compilation fails.
> 
>       How do I tell cmake to use fortran instead, I
>       thought it would automatically do this from the .f90 suffix. I'm
>       using cmake 2.8.1.

Set the LINKER_LANGUAGE property of your main program target
to "Fortran", and see the CMAKE_<LANG>_LINKER_PREFERENCE and
CMAKE_<LANG>_LINKER_PREFERENCE_PROPAGATES variables for more
information.

Regards,

Michael

> My test:
> 
> PROJECT( Test )
> 
> SET(PACKAGE_NAME "TEST")
> 
> CMAKE_MINIMUM_REQUIRED (VERSION 2.6)
> 
> SET (CMAKE_Fortran_COMPILER  gfortran)
> SET (CMAKE_CC_COMPILER  gcc)
> SET (CMAKE_CXX_COMPILER  g++)
> 
> # libraries are all shared by default
> option(BUILD_SHARED_LIBS "Build shared libraries" OFF)
> 
> ENABLE_LANGUAGE(Fortran)
> 
> SET(F_OBJ submain.f90)
> 
> SET(C_OBJ test.cpp)
> 
> ADD_LIBRARY (name STATIC ${F_OBJ} ${C_OBJ})
> 
> ADD_EXECUTABLE(a.out main.f90)
> 
> TARGET_LINK_LIBRARIES(a.out name)