[CMake] FW: building a mixed language programm with CMake

[Arjen Markus]

Hello Natalie,

the linkstep in your makefile tries to create a complete program
out of hello.o, but the main program is in test.o.

In the PLplot project (http://plplot.sf.net) we have a similar
configuration: different programming languages that need to
be combined. The approach we take is:
- create a library (static or dynamic) from the sources in one
   programming language
- create programs using these separate libraries

While I can not come up right now with the ready made CMakeLists.txt
file, I think that is the way to do it:
- turn hello.f90 into a library (say libhello.a)
- create the program from test.cpp using that library as a dependency.

Regards,

Arjen

On 2009-06-10 15:31, Natalie Happenhofer wrote:
> Hi!
> I have run the commands:
> 
> $ nm test.o
>                  U __gxx_personality_v0
>                  U hello1_
> 0000000000000000 T main
> $ nm hello.o
>                  U _gfortran_st_write
>                  U _gfortran_st_write_done
>                  U _gfortran_transfer_character
> 0000000000000000 T hello1_
> 
> $ make VERBOSE=1
> /usr/bin/cmake -H/home/happenhofer/versuche/CMake_tryout/Fortran 
> -B/home/happenhofer/versuche/CMake_tryout/Fortran --check-build-system 
> CMakeFiles/Makefile.cmake 0
> /usr/bin/cmake -E cmake_progress_start 
> /home/happenhofer/versuche/CMake_tryout/Fortran/CMakeFiles 
> /home/happenhofer/versuche/CMake_tryout/Fortran/CMakeFiles/progress.make
> make -f CMakeFiles/Makefile2 all
> make[1]: Entering directory 
> `/home/happenhofer/versuche/CMake_tryout/Fortran'
> make -f CMakeFiles/hi.dir/build.make CMakeFiles/hi.dir/depend
> make[2]: Entering directory 
> `/home/happenhofer/versuche/CMake_tryout/Fortran'
> cd /home/happenhofer/versuche/CMake_tryout/Fortran && /usr/bin/cmake -E 
> cmake_depends "Unix Makefiles" 
> /home/happenhofer/versuche/CMake_tryout/Fortran 
> /home/happenhofer/versuche/CMake_tryout/Fortran 
> /home/happenhofer/versuche/CMake_tryout/Fortran 
> /home/happenhofer/versuche/CMake_tryout/Fortran 
> /home/happenhofer/versuche/CMake_tryout/Fortran/CMakeFiles/hi.dir/DependInfo.cmake 
> --color=
> make[2]: Leaving directory `/home/happenhofer/versuche/CMake_tryout/Fortran'
> make -f CMakeFiles/hi.dir/build.make CMakeFiles/hi.dir/requires
> make[2]: Entering directory 
> `/home/happenhofer/versuche/CMake_tryout/Fortran'
> make[2]: Nothing to be done for `CMakeFiles/hi.dir/requires'.
> make[2]: Leaving directory `/home/happenhofer/versuche/CMake_tryout/Fortran'
> make -f CMakeFiles/hi.dir/build.make CMakeFiles/hi.dir/build
> make[2]: Entering directory 
> `/home/happenhofer/versuche/CMake_tryout/Fortran'
> Linking Fortran executable hi
> /usr/bin/cmake -E cmake_link_script CMakeFiles/hi.dir/link.txt --verbose=1
> /usr/bin/gfortran   -fPIC  CMakeFiles/hi.dir/hello.o  -o hi -rdynamic 
> -lgfortran
> /usr/lib/gcc/x86_64-pc-linux-gnu/4.1.2/../../../../lib64/crt1.o: In 
> function `_start':
> (.text+0x20): undefined reference to `main'
> collect2: ld returned 1 exit status
> make[2]: *** [hi] Error 1
> make[2]: Leaving directory `/home/happenhofer/versuche/CMake_tryout/Fortran'
> make[1]: *** [CMakeFiles/hi.dir/all] Error 2
> make[1]: Leaving directory `/home/happenhofer/versuche/CMake_tryout/Fortran'
> make: *** [all] Error 2
> 
> 
> Thanks a lot for your effort!
> Natalie
> 
> 
>  > Date: Wed, 10 Jun 2009 05:50:11 -0700
>  > From: denis_scherbakov at yahoo.com
>  > Subject: Re: [CMake] FW: building a mixed language programm with CMake
>  > To: cmake at cmake.org; nataliehapp at hotmail.com
>  >
>  >
>  > > /usr/lib/gcc/x86_64-pc-linux-gnu/4.1.2/../../../../lib64/crt1.o:
>  > > In function `_start':
>  > > (.text+0x20): undefined reference to `main'
>  >
>  > Try to compile with VERBOSE option:
>  >
>  > make VERBOSE=1
>  >
>  > this will show you, what GCC does.
>  >
>  > > The only library I tell CMake to link to is libgfortran.so.
>  > > What libraries does CMake usually link to, without
>  > > specifying?
>  >
>  > None. CMake is a Makefile generator it does not compile or link.
>  > Could you run "nm test.o" and "nm hello.o" and post the result?
>  > Also post verbose output.
>  >
>  > Denis
>  >
>  >
>  >
>  >
> 
> ------------------------------------------------------------------------
> ¡Es hora que descubras quién eres! Alguien puede conocerte mejor que tu 
> mismo. <http://www.descubrewindowslive.com/>
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> Powered by www.kitware.com
> 
> Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html
> 
> Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ
> 
> Follow this link to subscribe/unsubscribe:
> http://www.cmake.org/mailman/listinfo/cmake