[CMake] Trying to mix C++ and Fortran code...

[Caron, Michael C. (US SSA)]

I'd like to say thanks to those who have responded to my plea for help.  I was able to finally figure out what the problem was and figured I should share.

As I suspected it was something stupid.  We use DevStudio .NET 2003 and Intel Fortran 9.0 to build our projects on windows.  We have C++ code with Fortran libraries and using DevStudio as the build environment we have built and linked successfully.  So we knew it could be done.  When we started using CMake from the command line we forgot about all those environment variables that the IDE auto-magically takes care of for you.  By simply calling the Intel Fortran Environment setup batch file (ifortvars.bat), we got all of the missing vars setup and the CMake generated makefile started to work flawlessly.

Thanks for the help,
Mike

-----Original Message-----
From: "Caron, Michael C. (US SSA)" <michael.caron at baesystems.com>
Subject: [CMake] Trying to mix C++ and Fortran code...
To: "cmake at cmake.org" <cmake at cmake.org>
Message-ID: <cd5fe9$4mmkbj at dmzms99802.na.baesystems.com>
Content-Type: text/plain; charset="us-ascii"

I've just started using CMake and have great hopes for it making my life simpler.  I currently have a windows console project that mixes C++ and Fortran code.  I have the main body of the code (in Fortran), an interface to display code written in C++(in Fortran), and some display code (C++).  I have used Visual Studio .NET 2003 and Intel Fortran 9.0 to build and link these successfully already, by building the project files and tweaking the appropriate build settings.  I'd like to switch to cmake generated build files so I can cross compile on Linux with a minimal amount of effort.  I could build makefiles for the Linux side, but then I'd have the nightmare of keeping both builds in sync.

I have created the CMakeLists.txt files for each of the subprojects (Fortran executable, Fortran Lib, and C++ Lib).  I've also generated nmake makefiles for each of the subprojects and used them to build with expected results.  Both the Fortran and C++ libs are built successfully and the Fortran executable fails complaining about unresolved externals (makes sense since I didn't point it to the libs yet).  When I add the code to the Fortran executable CMakeLists.txt to add_subdir for each of the static libs, and add the code to link the static libs things start to fall apart.

When I generate the make files my C++ lib no longer builds.  Looking around online I discovered the FortranCInterface and the FortranCInterface_VERIFY(CXX) cmake command.  I added an include for the FortranCInterface and the FortranCInterface_VERIFY(CXX) to the executable CMakeLists.txt file figuring that might provide some insight.  When I try to run cmake on that CMakeLists.txt file cmake complains that it could not compile the simple test file for the verify.

I know I can mix C++ and Fortran using the compilers I have, I've done it.  I must be missing some cmake magic.  Hopefully it is something stupid and someone will be able to see it and point it out to me.

Thanks in advance,
Michael Caron


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