[CMake] Building Matlab Mex files and CMake 2.60

[Brad King]

Benjamin Roy wrote:
> Hello,
> 
> I used to build Matlab Mex files using this kind of CMake files, the
> build was working Both on linux and Windows (only with visual studio,
> because gnumex is no longer support for MinGW and Matlab R2008):
> 
> # SET MEX files extension
> IF(UNIX)
> IF(APPLE)
> IF(CMAKE_OSX_ARCHITECTURES MATCHES i386)
> SET(MEX_EXTENSION mexmaci)
> ELSE(CMAKE_OSX_ARCHITECTURES MATCHES i386)
> SET(MEX_EXTENSION mexmac)
> ENDIF(CMAKE_OSX_ARCHITECTURES MATCHES i386)
> INCLUDE(FindMatlab)
> FIND_PROGRAM(MEX_COMPILER mex)
> ELSE(APPLE)
> SET(MEX_EXTENSION mexglx)
> INCLUDE(FindMatlab)
> FIND_PROGRAM(MEX_COMPILER mex)
> ENDIF(APPLE)
> ELSE(UNIX)
> IF(WIN32)
> IF( CMAKE_CXX_COMPILER STREQUAL "cl")
> SET(MEX_EXTENSION mexw32)
> INCLUDE(FindMatlab)
> FIND_PROGRAM(MEX_COMPILER mex)
> MESSAGE("Please set mex compiler with Visual Studio using Matlab command
> line and mex -setup command")
> ELSE( CMAKE_CXX_COMPILER STREQUAL "cl")
> MESSAGE("Matlab Mex files are only supported by MS Visual Studio")
> ENDIF( CMAKE_CXX_COMPILER STREQUAL "cl")
> ENDIF(WIN32)
> ENDIF(UNIX)
> 
> IF(MEX_COMPILER)
> 
> ADD_CUSTOM_TARGET(bookread_exp_matlab ALL echo
>        DEPENDS   
> ${MPTK_BINARY_DIR}/src/matlab/experimental/bookread_exp.${MEX_EXTENSION}
>  )
> 
> 
> ADD_CUSTOM_COMMAND(
>   TARGET bookread_exp_matlab
>   COMMAND   ${MEX_COMPILER}
>   ARGS      -O -DHAVE_FFTW3 -I${MATLAB_INCLUDE_DIR} -I${MPTK_BINARY_DIR}
> -I${MPTK_SOURCE_DIR}/src/tinyxml/ -I/usr/include/ -I${MPTK_SOURCE_DIR}
> -I${MPTK_SOURCE_DIR}/src/libdsp_windows/
> -I${MPTK_SOURCE_DIR}/src/libmptk/
> -I${MPTK_SOURCE_DIR}/src/matlab/experimental/classes/
> -I${MPTK_SOURCE_DIR}/src/plugin/base/
> -I${MPTK_SOURCE_DIR}/src/plugin/contrib/lam/ -I${FFTW3_INCLUDE_DIR}
> -I${MPTK_BINARY_DIR}/src/libmptk/
> ${MPTK_SOURCE_DIR}/src/matlab/experimental/bookread_exp.cpp
> ${MPTK_SOURCE_DIR}/src/matlab/experimental/classes/mxBook.cpp
> -L${MPTK_BINARY_DIR}/lib -lmptk
>   COMMENT   "MEX"
> )
> 
> ENDIF(MEX_COMPILER)
> 
> It was working fine till version 2.6.0. But now I ve got a make error:
> make[2]: *** No rule to make target `src/matlab/bookread.mexglx', needed
> by `src/matlab/CMakeFiles/bookread_matlab'.  Stop.
> make[1]: *** [src/matlab/CMakeFiles/bookread_matlab.dir/all] Error 2
> make: *** [all] Error 2
> 
> Did i miss something basic ? And why such differences in make files
> generated by CMake 2.6.0 and CMake 2.4.8 ?

I can't even get the above example to work in 2.4.  It looks like this
is a subdirectory of a larger build system.  Can you reproduce this
problem in a self-contained example please?

If I replace the line

  TARGET bookread_exp_matlab

with

  OUTPUT ${MPTK_BINARY_DIR}/src/matlab/experimental/bookread_exp.${MEX_EXTENSION}

then it works in both 2.4 and 2.6.

-Brad