[CMake] linking main Fortran and C++

[kent williams]

I know you're simplifying to provide an example, but I hope you don't
normally set CMAKE_CC_COMPILER, CMAKE_Fortran_COMPILER and
CMAKE_CXX_COMPILER in your CMakeLists.txt.

That's precisely the sort of thing that CMake is meant to find for
you.  It will find the compilers needed to compile your source, and
then you can override CMake's default choice if you want to.

On Mon, Oct 18, 2010 at 11:35 PM, Michael Scot Breitenfeld
<brtnfld at uiuc.edu> wrote:
> Thanks, this works now:
>
> 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})
> SET_TARGET_PROPERTIES(name PROPERTIES LINKER_LANGUAGE Fortran)
>
> ADD_EXECUTABLE(a.out main.f90)
> SET_TARGET_PROPERTIES(a.out PROPERTIES LINKER_LANGUAGE Fortran)
> TARGET_LINK_LIBRARIES(a.out name)
>
>
> OUTPUT:
>
> Scanning dependencies of target name
> [ 33%] Building Fortran object CMakeFiles/name.dir/submain.f90.o
> [ 66%] Building CXX object CMakeFiles/name.dir/test.cpp.o
> Linking Fortran static library libname.a
> [ 66%] Built target name
> Scanning dependencies of target a.out
> [100%] Building Fortran object CMakeFiles/a.out.dir/main.f90.o
> Linking Fortran executable a.out
> [100%] Built target a.out
>
> Added bonus is it links -lstdc++ automatically.
>
>
>
> On 10/18/2010 10:30 PM, Michael Hertling wrote:
>> 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)
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