[CMake] Wrong flags in fortran project when use c library

Kelly (KT) Thompson kt at transpireinc.com
Mon Oct 19 19:43:42 EDT 2009 

Clint,

I still see the problem listed in #8744.  I'm using CMake-2.8.0-rc3. For my
projects, we reset all compiler flags so I don't really keep track of it.

-kt

On Tue, Oct 13, 2009 at 3:06 PM, Clinton Stimpson <clinton at elemtech.com>wrote:

>
> Oh, do you have a Release/Debug link issue with this?
> Does the patch in this bug report help:
> http://public.kitware.com/Bug/view.php?id=8744
>
> Clint
>
> On Tuesday 13 October 2009 03:56:13 pm Sebas wrote:
> > Thanks Kelly by your explication, I learn a lot. With incorporating
> > "PROPERTIES LINKER_LANGUAGE Fortran" work, without add other thing that
> > "/NODEFAULTLIB:MSVCRTD.lib" (may be is it related with /MD and /MT?).
> > For mayor understand, CLibrary in ProgramFortran Directory is for
> interface
> > of fortran to CLibrary2 y CPPLibrary2. They are extern librarys that if
> > posible not modified (SuperLU, tetgen, etc), for it "extern "C"" is
> > incorporated in CPPLibrary.
> > In Linux i have to use "TARGET_LINK_LIBRARIES( FortranProgram CLibrary
> > stdc++ )" for link. Why?
> > I attach second example if someone want see it.
> >
> > Bill, create I bug report o not?, with the first example.
> > With 2.8 rc3 don't work in windows (don't compile test file).
> >
> > Thanks.
> >
> > Sebastian
> >
> > On Fri, Oct 9, 2009 at 7:05 PM, Kelly (KT) Thompson
> <kt at transpireinc.com>wrote:
> > > On Fri, Oct 9, 2009 at 12:49 PM, Bill Hoffman
> <bill.hoffman at kitware.com>wrote:
> > >> Kelly (KT) Thompson wrote:
> > >>
> > >>  On Fri, Oct 9, 2009 at 6:15 AM, Sebas <spaseba at gmail.com <mailto:
> > >>> spaseba at gmail.com>> wrote:
> > >>>
> > >>>    I send a example where happen explained before ( I have similar
> > >>>    struct in my Program). I include too the VS2008 project generate
> by
> > >>>    cmake. In the Fortran Project be can seen that use /W3 /Zm1000 /GR
> > >>>    /RTC1 /TP Flags that don't work with ifort.
> > >>>    I use CMake 2.8 rc2 (but happen same in 2.6 and 2.7)
> > >>>
> > >>>    Thanks.
> > >>>
> > >>>    Sebastian
> > >>>
> > >>>
> > >>> Sebastian,
> > >>>
> > >>> You are mixing C, C++ and Fortran sources in a single project.  This
> > >>> does not work well in general and particularly in CMake.  I was able
> to
> > >>> restructure your sample code so that it will build with NMake
> Makefile
> > >>> (Visual Studio 2008 SP1 and Intel Visual Fortran 11).
> > >>>
> > >>> Key points:
> > >>>
> > >>> 1. all C++ code goes into a single directory and produces a single
> > >>> library.  The CMakeLists.txt has the project name CPPLibrary2.
> > >>>
> > >>> 2. each C library is built only from C sources. The CMakeLists.txt
> > >>> files are given the project name CLibrary and CLibrary2.
> > >>>
> > >>> 3. the Fortran is also isolated into a single directory and the local
> > >>> CMakeLists.txt file only deals with the Fortran.
> > >>>
> > >>> 4. CMake needs help knowing how to build mixed language targets that
> > >>> must be compiled with the Fortran compiler.  In the Fortran
> > >>> CMakeLists.txt I had to set_target properties for LINKER_LANGUAGE.
> > >>>
> > >>> 5. When mixing C and Fortran on the Windows platform you must use the
> > >>> same type of runtime libraries (/MT or /MD).  The default Fortran
> build
> > >>> uses /MT, so I had to set these to /MD (Fortran_FLAGS)
> > >>>
> > >>> 6. When interfacing C++ and Fortran code, you must mark the C++
> > >>> function as extern "C" to avoid name mangling issues.  The Fortran
> also
> > >>> expects the C++ symbol name to be all caps.  You can use Fortran's
> > >>> ISO_C_BINDING to get around this platform issue.
> > >>>
> > >>> There are many changes required to your sample build so I decided
> that
> > >>> a zip file would be the best way to return the project to you.
> > >>>
> > >>>  Thanks for the work around.  However, this should work a bit
> smoother,
> > >>
> > >> Sebastian can you create a bug report and attach your example?
> > >>
> > >> Thanks.
> > >>
> > >> -Bill
> > >
> > > Bill,
> > >
> > > It is my understanding that each CMake target must be 'language pure"
> > > The following example will work (and is less complex).  This example
> > > assumes that all sources are in a single directory (see below).
>  Because
> > > Sebastian had separate directories for each language, I assumed that
> was
> > > important for his build setup and tried to be faithful to that layout.
> > >
> > > I think the key feature that was missing from his original setup was:
> > >
> > >   set_target_properties( FortranProgram PROPERTIES LINKER_LANGUAGE
> > > Fortran )
> > >
> > > Without that that statement, CMake will build FortranProgram.obj
> > > correctly, but then try to generate the .exe by calling the MSVC linker
> > > (using the link flags for C).
> > >
> > > -kt
> > >
> > > ## Single directory equivalent CMakeLists.txt:
> > >
> > > CMAKE_MINIMUM_REQUIRED(VERSION 2.6)
> > > PROJECT( FortranProgram C CXX Fortran )
> > >
> > > # Find local headers
> > > INCLUDE_DIRECTORIES( ${PROJECT_SOURCE_DIR} )
> > >
> > > # Library CLibrary2
> > > ADD_LIBRARY( CLibrary2 CLibrary2.c )
> > >
> > > # Library CPPLibrary
> > > ADD_LIBRARY( CPPLibrary2 CPPLibrary2.cpp )
> > >
> > > # Library: CLibrary
> > > ADD_LIBRARY( CLibrary CLibrary.c )
> > > TARGET_LINK_LIBRARIES( CLibrary CLibrary2 CPPLibrary2 )
> > >
> > > # Fortran
> > > ADD_EXECUTABLE( FortranProgramExe FortranProgram.f90 )
> > > TARGET_LINK_LIBRARIES( FortranProgramExe CLibrary CLibrary2 CPPLibrary2
> )
> > >
> > > set(CMAKE_Fortran_FLAGS_DEBUG   "/Od /DDEBUG /MDd" )
> > > set(CMAKE_Fortran_FLAGS_RELEASE "/O2 /Ob2 /DNDEBUG /MD" )
> > > set(CMAKE_Fortran_FLAGS_MINSIZEREL "/Os /DNDEBUG /MD" )
> > > set(CMAKE_Fortran_FLAGS_RELWITHDEBINFO "/O2 /Ob2 /DDEBUG /MD" )
> > >
> > > IF( MSVC_IDE )
> > >   set_target_properties( FortranProgramExe
> > >     PROPERTIES
> > >       LINKER_LANGUAGE Fortran
> > >       LINK_FLAGS "/SUBSYSTEM:CONSOLE"
> > >       OUTPUT_NAME FortranProgram
> > >   )
> > > ELSEIF( WIN32 )
> > >   set_target_properties( FortranProgramExe
> > >     PROPERTIES
> > >       LINKER_LANGUAGE Fortran
> > >       OUTPUT_NAME FortranProgram
> > >   )
> > > ENDIF()
>
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