Le lundi 26 mars 2012 à 18:11 +0200, PINO Daniel a écrit :
> Hello all,
> 
> I'm just starting to use gmsh and its API. I'm currently trying to
> compile one of the examples available in utils/api_demos/ but I'm
> getting some troubles...
> 
> 
> I've already compiled Gmsh without any problem. 
> 
> I think the problem comes from the mekafile, I don't know how to compile
> those files. 
> 
> How should I use cmake to create the corresponding makefile for this
> code?
> 
> Does anybody already have the Makefiles to compile those files
> (utils/api_demos)?
> 
> Thank you very much for your help.

Here is a quick and dirty hack of CMakeLists.txt in utils/api_demos
to make allmost all demos compile except the one for leveset because of
a missing header...

Hope it helps

> 
> Best, 
> 
>       Daniel
> 
> 
> _______________________________________________
> gmsh mailing list
> [email protected]
> http://www.geuz.org/mailman/listinfo/gmsh

cmake_minimum_required(VERSION 2.6 FATAL_ERROR)

# if CMAKE_BUILD_TYPE is specified use it; otherwise set the default
# build type to "RelWithDebInfo" ("-O2 -g" with gcc) prior to calling
# project()
if(DEFINED CMAKE_BUILD_TYPE)
  set(CMAKE_BUILD_TYPE ${CMAKE_BUILD_TYPE} CACHE STRING "Choose build type")
else(DEFINED CMAKE_BUILD_TYPE)
  set(CMAKE_BUILD_TYPE RelWithDebInfo CACHE STRING "Choose build type")
endif(DEFINED CMAKE_BUILD_TYPE)

project(api_demos CXX C)

# this variable controls the default value of the "ENABLE_XXX" options which are
# normally set to ON (useful if you want to configure a minimal version of Gmsh:
# e.g. "cmake -DDEFAULT=0 -DENABLE_POST=1 -DENABLE_PARSER=1")
set(DEFAULT ON CACHE INTERNAL "Default value for options")

option(ENABLE_GMSH "Enable Gmsh" ${DEFAULT})
option(ENABLE_ANN "Enable ANN to compute Approximate Nearest Neighbors" ${DEFAULT})
option(ENABLE_KBIPACK "Enable Kbipack for homology solver" ${DEFAULT})
option(ENABLE_MATHEX "Enable MathEx expression parser" ${DEFAULT})
option(ENABLE_OCC "Enable Open CASCADE geometrical models" ${DEFAULT})
option(ENABLE_PETSC "Enable PETSc linear algebra solvers" ${DEFAULT})
option(ENABLE_SLEPC "Enable SLEPc eigensolvers" ${DEFAULT})
option(ENABLE_FLTK "Build FLTK GUI" ${DEFAULT})
option(ENABLE_FL_TREE "Enable FLTK tree browser widget" ${DEFAULT})
option(ENABLE_MED "Enable MED mesh and post-processing file formats" ${DEFAULT})
option(ENABLE_MMG3D "Enable 3D Mobile Mesh Generation" ${DEFAULT})
option(ENABLE_TETGEN "Enable Tetgen mesh generator" ${DEFAULT})
option(ENABLE_TETGEN_NEW "Enable experimental version of Tetgen" OFF)
option(ENABLE_GRAPHICS "Compile-in OpenGL graphics even if there is no GUI" OFF)
option(ENABLE_MESH "Build the mesh module" ${DEFAULT})
option(ENABLE_POST "Build the post-processing module" ${DEFAULT})
option(ENABLE_PLUGINS "Build the post-processing plugins" ${DEFAULT})
option(ENABLE_DINTEGRATION "Enable discrete integration and levelsets" ${DEFAULT})
option(ENABLE_BLAS_LAPACK "Use BLAS and Lapack for linear algebra" ON)

include(CheckTypeSize)
include(CheckFunctionExists)
include(CheckIncludeFile)

macro(find_all_libraries VARNAME LISTNAME PATH SUFFIX)
  set(${VARNAME})
  list(LENGTH ${LISTNAME} NUM_LIST)
  foreach(LIB ${${LISTNAME}})
    find_library(FOUND_LIB ${LIB} PATHS ${PATH} PATH_SUFFIXES ${SUFFIX})
    if(FOUND_LIB)
      list(APPEND ${VARNAME} ${FOUND_LIB})
    endif(FOUND_LIB)
    set(FOUND_LIB FOUND_LIB-NOTFOUND CACHE INTERNAL "")
    # unset(FOUND_LIB CACHE) # cleaner, but only available in cmake >= 2.6.4
  endforeach(LIB)
  list(LENGTH ${VARNAME} NUM_FOUND_LIBRARIES)
  if(NUM_FOUND_LIBRARIES LESS NUM_LIST)
    set(${VARNAME})
  endif(NUM_FOUND_LIBRARIES LESS NUM_LIST)
endmacro(find_all_libraries)

macro(set_config_option VARNAME STRING)
  set(${VARNAME} TRUE)
  list(APPEND CONFIG_OPTIONS ${STRING})
  message(STATUS "Found " ${STRING})
endmacro(set_config_option)

# check if the machine is 64 bits (this is more reliable than using
# CMAKE_SIZEOF_VOID_P, which does not seem to work e.g. on some Suse
# machines)
check_type_size("void*" SIZEOF_VOID_P)
if(SIZEOF_VOID_P EQUAL 8)
  set_config_option(HAVE_64BIT_SIZE_T "Have64BitSizeT")
endif(SIZEOF_VOID_P EQUAL 8)

if(ENABLE_BLAS_LAPACK)
  if(MSVC)
    # on Windows with Visual C++ try really hard to find blas/lapack
    # *without* requiring a Fortran compiler: 1) try to find the Intel
    # MKL libs using the standard search path; if not found 2) try to
    # get the reference blas/lapack libs (useful for users with no
    # Fortran compiler and no MKL license, who can just download our
    # precompiled "gmsh-dep" package)
    if(HAVE_64BIT_SIZE_T)
      set(MKL_PATH em64t/lib)
    else(HAVE_64BIT_SIZE_T)
      set(MKL_PATH ia32/lib)
    endif(HAVE_64BIT_SIZE_T)
    set(MKL_LIBS_REQUIRED libguide40 mkl_intel_c mkl_intel_thread mkl_core)
    find_all_libraries(LAPACK_LIBRARIES MKL_LIBS_REQUIRED "" ${MKL_PATH})
    if(LAPACK_LIBRARIES)
      set_config_option(HAVE_BLAS "Blas(IntelMKL)")
      set_config_option(HAVE_LAPACK "Lapack(IntelMKL)")
    else(LAPACK_LIBRARIES)
      set(REFLAPACK_LIBS_REQUIRED lapack blas g2c gcc)
      find_all_libraries(LAPACK_LIBRARIES REFLAPACK_LIBS_REQUIRED "" "")
      if(LAPACK_LIBRARIES)
        set_config_option(HAVE_BLAS "Blas(Ref)")
        set_config_option(HAVE_LAPACK "Lapack(Ref)")
      endif(LAPACK_LIBRARIES)
    endif(LAPACK_LIBRARIES)
  elseif(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
    # on Linux try to find the Intel MKL without a Fortran compiler
    if(HAVE_64BIT_SIZE_T)
      set(MKL_PATH lib/em64t)
    else(HAVE_64BIT_SIZE_T)
      set(MKL_PATH lib/32)
    endif(HAVE_64BIT_SIZE_T)
    set(MKL_LIBS_REQUIRED mkl_gf_lp64 iomp5 mkl_gnu_thread mkl_core guide pthread)
    find_all_libraries(LAPACK_LIBRARIES MKL_LIBS_REQUIRED "" ${MKL_PATH})
    if(NOT LAPACK_LIBRARIES)
      #match lapack 9.0 on 64bit
      set(MKL_LIBS_REQUIRED mkl_lapack mkl_em64t guide)
      find_all_libraries(LAPACK_LIBRARIES MKL_LIBS_REQUIRED "" ${MKL_PATH})
    endif(NOT LAPACK_LIBRARIES)
    if(LAPACK_LIBRARIES)
      set_config_option(HAVE_BLAS "Blas(IntelMKL)")
      set_config_option(HAVE_LAPACK "Lapack(IntelMKL)")
    else(LAPACK_LIBRARIES)
      # on Linux also try to find ATLAS without a Fortran compiler,
      # because cmake ships with a buggy FindBLAS e.g. on Ubuntu Lucid
      # Lynx
      set(ATLAS_LIBS_REQUIRED lapack f77blas cblas atlas)
      find_all_libraries(LAPACK_LIBRARIES ATLAS_LIBS_REQUIRED "" "")
      if(LAPACK_LIBRARIES)
        set_config_option(HAVE_BLAS "Blas(ATLAS)")
        set_config_option(HAVE_LAPACK "Lapack(ATLAS)")
      endif(LAPACK_LIBRARIES)
    endif(LAPACK_LIBRARIES)
  elseif(${CMAKE_SYSTEM_NAME} MATCHES "SunOS")
    # on SunOS we know blas and lapack are available in sunperf
    set(LAPACK_FLAGS -library=sunperf)
    set_config_option(HAVE_BLAS "Blas(SubPerf)")
    set_config_option(HAVE_LAPACK "Lapack(SunPerf)")
  elseif(APPLE)
    # on Mac we also know that blas and lapack are available
    set(LAPACK_LIBRARIES "-framework vecLib")
    set_config_option(HAVE_BLAS "Blas(VecLib)")
    set_config_option(HAVE_LAPACK "Lapack(VecLib)")
  endif(MSVC)
  if(NOT HAVE_BLAS OR NOT HAVE_LAPACK)
    # if we haven't found blas and lapack without using the standard
    # cmake tests, do it (this requires a working Fortran compiler)
    enable_language(Fortran)
    find_package(BLAS)
    if(BLAS_FOUND)
      set_config_option(HAVE_BLAS "Blas")
      find_package(LAPACK)
      if(LAPACK_FOUND)
        set_config_option(HAVE_LAPACK "Lapack")
      else(LAPACK_FOUND)
        set(LAPACK_LIBRARIES ${BLAS_LIBRARIES})
      endif(LAPACK_FOUND)
      if(CMAKE_Fortran_COMPILER_ID MATCHES "GNU")
        if(CMAKE_Fortran_COMPILER MATCHES "gfortran")
          list(APPEND LAPACK_LIBRARIES gfortran)
        elseif(CMAKE_Fortran_COMPILER MATCHES "f95")
          list(APPEND LAPACK_LIBRARIES gfortran)
        elseif(CMAKE_Fortran_COMPILER MATCHES "g77")
          list(APPEND LAPACK_LIBRARIES g2c)
        endif(CMAKE_Fortran_COMPILER MATCHES "gfortran")
      endif(CMAKE_Fortran_COMPILER_ID MATCHES "GNU")
    endif(BLAS_FOUND)
  endif(NOT HAVE_BLAS OR NOT HAVE_LAPACK)
  if(NOT HAVE_BLAS OR NOT HAVE_LAPACK)
    message("WARNING: Could not find Blas or Lapack: most meshing algorithms "
            "will not be functional")
  endif(NOT HAVE_BLAS OR NOT HAVE_LAPACK)
endif(ENABLE_BLAS_LAPACK)

if(ENABLE_KBIPACK)
  find_library(GMP_LIB gmp)
  if(GMP_LIB)
    find_path(GMP_INC "gmp.h" PATH_SUFFIXES src include)
    if(GMP_INC)
      set_config_option(HAVE_GMP "GMP")
      list(APPEND EXTERNAL_LIBRARIES ${GMP_LIB})
      list(APPEND EXTERNAL_INCLUDES ${GMP_INC})
      include_directories(../../contrib/kbipack)
      set_config_option(HAVE_KBIPACK "Kbipack")
    endif(GMP_INC)
  endif(GMP_LIB)
endif(ENABLE_KBIPACK)

if(ENABLE_MATHEX)
  include_directories(../../contrib/MathEx)
  set_config_option(HAVE_MATHEX "MathEx")
endif(ENABLE_MATHEX)

if(ENABLE_PETSC)
    set(ENV_PETSC_DIR $ENV{PETSC_DIR})
    set(ENV_PETSC_ARCH $ENV{PETSC_ARCH})
    if(EXISTS ${ENV_PETSC_DIR}/${ENV_PETSC_ARCH}/conf/petscvariables)
      # old-style PETSc installations (using PETSC_DIR and PETSC_ARCH)
      set_config_option(HAVE_PETSC "PETSc")
      file(STRINGS ${ENV_PETSC_DIR}/${ENV_PETSC_ARCH}/conf/petscvariables 
           PETSC_VARIABLES NEWLINE_CONSUME)
      # find include directories
      list(APPEND EXTERNAL_INCLUDES ${ENV_PETSC_DIR}/include)
      list(APPEND EXTERNAL_INCLUDES ${ENV_PETSC_DIR}/${ENV_PETSC_ARCH}/include)
      string(REGEX MATCH "PACKAGES_INCLUDES = [^\n\r]*" PETSC_PACKAGES_INCLUDES
             ${PETSC_VARIABLES})
      if(PETSC_PACKAGES_INCLUDES)
        string(REPLACE "PACKAGES_INCLUDES = " "" PETSC_PACKAGES_INCLUDES
               ${PETSC_PACKAGES_INCLUDES})
        if(PETSC_PACKAGES_INCLUDES)
          string(REPLACE "-I" "" PETSC_PACKAGES_INCLUDES ${PETSC_PACKAGES_INCLUDES})
          string(REPLACE " " ";" PETSC_PACKAGES_INCLUDES ${PETSC_PACKAGES_INCLUDES})
          foreach(VAR ${PETSC_PACKAGES_INCLUDES})
            list(APPEND EXTERNAL_INCLUDES ${VAR})
          endforeach(VAR)
        endif(PETSC_PACKAGES_INCLUDES)
      endif(PETSC_PACKAGES_INCLUDES)
      # find libraries (<= 3.0)
      set(PETSC_LIBS_REQUIRED petscksp petscdm petscmat petscvec petsc)
      find_all_libraries(PETSC_LIBS PETSC_LIBS_REQUIRED 
                         ${ENV_PETSC_DIR}/${ENV_PETSC_ARCH}/lib "")
      # petsc 3.1 creates only one library (libpetsc)
      if(NOT PETSC_LIBS)
        find_library(PETSC_LIBS petsc PATHS ${ENV_PETSC_DIR}/${ENV_PETSC_ARCH}/lib)
      endif(NOT PETSC_LIBS)
      # find slepc (needs to be linked in before petsc)
      if(ENABLE_SLEPC)
        set(ENV_SLEPC_DIR $ENV{SLEPC_DIR})
        find_library(SLEPC_LIB slepc PATHS ${ENV_SLEPC_DIR}/${ENV_PETSC_ARCH}/lib)
        if(SLEPC_LIB)
          find_path(SLEPC_INC "slepc.h" PATHS ${ENV_SLEPC_DIR} PATH_SUFFIXES include 
                    ${ENV_PETSC_ARCH}/include include/slepc)
          if(SLEPC_INC)
            set_config_option(HAVE_SLEPC "SLEPc")
            list(APPEND EXTERNAL_LIBRARIES ${SLEPC_LIB})
            list(APPEND EXTERNAL_INCLUDES ${SLEPC_INC}) 
            find_path(SLEPC_INC2 "slepcconf.h" PATHS ${ENV_SLEPC_DIR} 
                      PATH_SUFFIXES ${ENV_PETSC_ARCH}/include)
            if(SLEPC_INC2)
              list(APPEND EXTERNAL_INCLUDES ${SLEPC_INC2}) 
            endif(SLEPC_INC2)
          endif(SLEPC_INC)
        endif(SLEPC_LIB)
        if(NOT HAVE_SLEPC AND NOT ENV_SLEPC_DIR)
           message("WARNING: Export SLEPC_DIR before calling cmake")
        endif(NOT HAVE_SLEPC AND NOT ENV_SLEPC_DIR)
      endif(ENABLE_SLEPC)
      list(APPEND EXTERNAL_LIBRARIES ${PETSC_LIBS})
      # find additional libraries to link with
      string(REGEX MATCH "PACKAGES_LIBS = [^\n\r]*" PLIBS ${PETSC_VARIABLES})
      if(PLIBS)
        string(REPLACE "PACKAGES_LIBS = " "" PLIBS ${PLIBS})
        string(STRIP ${PLIBS} PLIBS)
        list(APPEND EXTERNAL_LIBRARIES "${PLIBS}")
      endif(PLIBS)
      string(REGEX MATCH "PETSC_EXTERNAL_LIB_BASIC = [^\n\r]*" PLIBS_BASIC ${PETSC_VARIABLES})
      if(PLIBS_BASIC)
        string(REPLACE "PETSC_EXTERNAL_LIB_BASIC = " "" PLIBS_BASIC ${PLIBS_BASIC})
        string(STRIP ${PLIBS_BASIC} PLIBS_BASIC)
        list(APPEND EXTERNAL_LIBRARIES "${PLIBS_BASIC}")
      endif(PLIBS_BASIC)
      string(REGEX MATCH "PCC_LINKER_LIBS = [^\n\r]*" LLIBS ${PETSC_VARIABLES})
      if(LLIBS)
        string(REPLACE "PCC_LINKER_LIBS = " "" LLIBS ${LLIBS})
        string(STRIP ${LLIBS} LLIBS)
        list(APPEND EXTERNAL_LIBRARIES "${LLIBS}")
      endif(LLIBS)
    else(EXISTS ${ENV_PETSC_DIR}/${ENV_PETSC_ARCH}/conf/petscvariables)
      # new-style PETSc installations (in standard system directories)
      find_library(PETSC_LIBS petsc)
      find_path(PETSC_INC "petsc.h" PATH_SUFFIXES include/petsc)
      if(PETSC_LIBS AND PETSC_INC)
        set_config_option(HAVE_PETSC "PETSc")
        if(ENABLE_SLEPC)
          find_library(SLEPC_LIB slepc)
          find_path(SLEPC_INC "slepc.h" PATH_SUFFIXES include/slepc)
          if(SLEPC_LIB AND SLEPC_INC)
            set_config_option(HAVE_SLEPC "SLEPc")
            list(APPEND EXTERNAL_LIBRARIES ${SLEPC_LIB})
            list(APPEND EXTERNAL_INCLUDES ${SLEPC_INC}) 
          endif(SLEPC_LIB AND SLEPC_INC)
        endif(ENABLE_SLEPC)
        list(APPEND EXTERNAL_LIBRARIES ${PETSC_LIBS})
        list(APPEND EXTERNAL_INCLUDES ${PETSC_INC}) 
      endif(PETSC_LIBS AND PETSC_INC)
    endif(EXISTS ${ENV_PETSC_DIR}/${ENV_PETSC_ARCH}/conf/petscvariables)
    if(NOT HAVE_PETSC AND NOT ENV_PETSC_DIR)
       message("WARNING: Export PETSC_DIR before calling cmake")
    endif(NOT HAVE_PETSC AND NOT ENV_PETSC_DIR)
    if(NOT HAVE_PETSC AND NOT ENV_PETSC_ARCH)
       message("WARNING: Export PETSC_ARCH before calling cmake")
    endif(NOT HAVE_PETSC AND NOT ENV_PETSC_ARCH)
  endif(ENABLE_PETSC)

if(ENABLE_OCC)
  if(WIN32 OR CYGWIN)
    if(HAVE_64BIT_SIZE_T)
      set(OCC_SYS_NAME win64)
    else(HAVE_64BIT_SIZE_T)
      set(OCC_SYS_NAME win32)
    endif(HAVE_64BIT_SIZE_T)
  else(WIN32 OR CYGWIN)
    set(OCC_SYS_NAME ${CMAKE_SYSTEM_NAME})
  endif(WIN32 OR CYGWIN)
  set(OCC_LIBS_REQUIRED
      # subset of DataExchange
      TKSTEP TKSTEP209 TKSTEPAttr TKSTEPBase TKIGES TKXSBase
      # ModelingAlgorithms
      TKOffset TKFeat TKFillet TKBool TKShHealing TKMesh TKHLR TKBO TKPrim
      TKTopAlgo TKGeomAlgo
      # ModelingData
      TKBRep TKGeomBase TKG3d TKG2d
      # FoundationClasses
      TKAdvTools TKMath TKernel)
  list(LENGTH OCC_LIBS_REQUIRED NUM_OCC_LIBS_REQUIRED)
  set(OCC_LIBS)
  foreach(OCC ${OCC_LIBS_REQUIRED})
    find_library(OCC_LIB ${OCC} HINTS ENV CASROOT PATH_SUFFIXES lib 
                 ${OCC_SYS_NAME}/lib ${OCC_SYS_NAME}/vc8/lib)
    if(OCC_LIB)
      list(APPEND OCC_LIBS ${OCC_LIB})
    else(OCC_LIB)
      message(STATUS "OCC lib " ${OCC} " not Found")
    endif(OCC_LIB)
    set(OCC_LIB OCC_LIB-NOTFOUND CACHE INTERNAL "")
    # unset(OCC_LIB CACHE) # cleaner, but only available in cmake >= 2.6.4
  endforeach(OCC)
  list(LENGTH OCC_LIBS NUM_OCC_LIBS)
  if(NUM_OCC_LIBS EQUAL NUM_OCC_LIBS_REQUIRED)
    find_path(OCC_INC "BRep_Tool.hxx" PATHS ENV CASROOT PATH_SUFFIXES inc 
              include include/oce opencascade)
    if(OCC_INC)
      set_config_option(HAVE_OCC "OpenCascade")
      list(APPEND EXTERNAL_LIBRARIES ${OCC_LIBS})
      list(APPEND EXTERNAL_INCLUDES ${OCC_INC})
      if(HAVE_64BIT_SIZE_T)
        add_definitions(-D_OCC64)
      endif(HAVE_64BIT_SIZE_T)
      if(CYGWIN)
        list(APPEND EXTERNAL_LIBRARIES "winspool")
      elseif(MSVC)
        add_definitions(-DWNT)
      endif(CYGWIN)
      find_path(OCC_CONFIG_H "config.h" PATHS ${OCC_INC} ${OCC_CONFIG_H_PATH}
                NO_DEFAULT_PATH)
      if(NOT OCC_CONFIG_H)
        add_definitions(-DHAVE_NO_OCC_CONFIG_H)
      endif(NOT OCC_CONFIG_H)
    endif(OCC_INC)
  endif(NUM_OCC_LIBS EQUAL NUM_OCC_LIBS_REQUIRED)
endif(ENABLE_OCC)

if(ENABLE_ANN)
  find_library(ANN_LIB ann PATH_SUFFIXES lib)
  find_path(ANN_INC "ANN.h" PATH_SUFFIXES src include ANN)
  if(ANN_LIB AND ANN_INC)
    list(APPEND EXTERNAL_LIBRARIES ${ANN_LIB})
    list(APPEND EXTERNAL_INCLUDES ${ANN_INC})
    set_config_option(HAVE_ANN "Ann")
  else(ANN_LIB AND ANN_INC)
    message(STATUS "System ANN not found - using contrib/ANN instead")
    add_subdirectory(../contrib/ANN)
    include_directories(../contrib/ANN/include)
  endif(ANN_LIB AND ANN_INC)
endif(ENABLE_ANN)

find_library(GMSH_LIB gmsh PATH_SUFFIXES lib)
find_path(GMSH_INC "Gmsh.h" PATH_SUFFIXES src include gmsh)
if(GMSH_LIB AND GMSH_INC)
  list(APPEND EXTERNAL_LIBRARIES ${GMSH_LIB})
  list(APPEND EXTERNAL_INCLUDES ${GMSH_INC})
  set_config_option(HAVE_GMSH "Gmsh")
else(GMSH_LIB AND GMSH_INC)
  message(STATUS "Gmsh.h not found")
endif(GMSH_LIB AND GMSH_INC)

find_library(ANTTWEAKBAR_LIB AntTweakBar PATH_SUFFIXES lib)
find_path(ANTTWEAKBAR_INC "AntTweakBar.h" PATH_SUFFIXES src include AntTweakBar)
if(ANTTWEAKBAR_LIB AND ANTTWEAKBAR_INC)
  list(APPEND EXTERNAL_LIBRARIES ${ANTTWEAKBAR_LIB})
  list(APPEND EXTERNAL_INCLUDES ${ANTTWEAKBAR_INC})
  set_config_option(HAVE_ANTTWEAKBAR "AntTweakBar")
else(ANTTWEAKBAR_LIB AND ANTTWEAKBAR_INC)
  message(STATUS "ANTTWEAKBAR not found")
endif(ANTTWEAKBAR_LIB AND ANTTWEAKBAR_INC)

if(ENABLE_FLTK)
  # first, try to use fltk-config for fltk >= 1.3 (FindFLTK is buggy
  # on Unix, where e.g. xft and xinerama options are not dealt with)
  find_program(FLTK_CONFIG_SCRIPT fltk-config)
  if(FLTK_CONFIG_SCRIPT)
    execute_process(COMMAND ${FLTK_CONFIG_SCRIPT} --api-version
                    OUTPUT_VARIABLE FLTK_VERSION)
    string(STRIP ${FLTK_VERSION} FLTK_VERSION)
    if(FLTK_VERSION GREATER 1.1)
      set_config_option(HAVE_FLTK "Fltk")
      message(STATUS "Using fltk-config script for Fltk " ${FLTK_VERSION})
      execute_process(COMMAND ${FLTK_CONFIG_SCRIPT} --use-gl --use-images --includedir
                      OUTPUT_VARIABLE FLTK_INCLUDE_DIR)
      string(STRIP ${FLTK_INCLUDE_DIR} FLTK_INCLUDE_DIR)
      list(APPEND EXTERNAL_INCLUDES ${FLTK_INCLUDE_DIR} ${FLTK_INCLUDE_DIR}/FL/images
           ${FLTK_INCLUDE_DIR}/jpeg ${FLTK_INCLUDE_DIR}/zlib ${FLTK_INCLUDE_DIR}/png)
      execute_process(COMMAND ${FLTK_CONFIG_SCRIPT} --use-gl --use-images --ldflags
                      OUTPUT_VARIABLE FLTK_LIBRARIES)
      string(STRIP ${FLTK_LIBRARIES} FLTK_LIBRARIES)
      string(REGEX MATCH "fltk[_ ]jpeg" FLTK_JPEG ${FLTK_LIBRARIES})
      string(REGEX MATCH "fltk[_ ]z" FLTK_Z ${FLTK_LIBRARIES})
      string(REGEX MATCH "fltk[_ ]png" FLTK_PNG ${FLTK_LIBRARIES})
    endif(FLTK_VERSION GREATER 1.1)
  endif(FLTK_CONFIG_SCRIPT)
  # then try the built-in FindFLTK module
  if(NOT HAVE_FLTK)
    set(FLTK_SKIP_FORMS TRUE)
    set(FLTK_SKIP_FLUID TRUE)
    find_package(FLTK)
    if(FLTK_FOUND)
      add_subdirectory(Fltk)
      set_config_option(HAVE_FLTK "Fltk")
      list(APPEND EXTERNAL_INCLUDES ${FLTK_INCLUDE_DIR})
      # find fltk jpeg
      find_library(FLTK_JPEG NAMES fltk_jpeg fltkjpeg)
      if(FLTK_JPEG)
        list(APPEND EXTERNAL_LIBRARIES ${FLTK_JPEG})
        foreach(DIR ${FLTK_INCLUDE_DIR})
          list(APPEND EXTERNAL_INCLUDES ${DIR}/FL/images ${DIR}/jpeg)
        endforeach(DIR)
      endif(FLTK_JPEG)
      # find fltk zlib
      find_library(FLTK_Z NAMES fltk_z fltkz)
      if(FLTK_Z)
        list(APPEND EXTERNAL_LIBRARIES ${FLTK_Z})
        foreach(DIR ${FLTK_INCLUDE_DIR})
          list(APPEND EXTERNAL_INCLUDES ${DIR}/FL/images ${DIR}/zlib)
        endforeach(DIR)
      endif(FLTK_Z)
      # find fltk png
      find_library(FLTK_PNG NAMES fltk_png fltkpng)
      if(FLTK_PNG)
        list(APPEND EXTERNAL_LIBRARIES ${FLTK_PNG})
        foreach(DIR ${FLTK_INCLUDE_DIR})
          list(APPEND EXTERNAL_INCLUDES ${DIR}/FL/images ${DIR}/png)
        endforeach(DIR)
      endif(FLTK_PNG)   
    endif(FLTK_FOUND)
  endif(NOT HAVE_FLTK)
  if(HAVE_FLTK)
    if(ENABLE_NATIVE_FILE_CHOOSER)
      if(NOT FLTK_VERSION OR FLTK_VERSION EQUAL 1.1)
        add_subdirectory(contrib/NativeFileChooser)
        include_directories(contrib/NativeFileChooser)
        add_definitions(-DFLTK1)
      endif(NOT FLTK_VERSION OR FLTK_VERSION EQUAL 1.1)
      set_config_option(HAVE_NATIVE_FILE_CHOOSER "NativeFileChooser")
    endif(ENABLE_NATIVE_FILE_CHOOSER)
    if(ENABLE_FL_TREE)
      if(NOT FLTK_VERSION OR FLTK_VERSION EQUAL 1.1)
        add_subdirectory(contrib/Fl_Tree)
        include_directories(contrib/Fl_Tree)
      endif(NOT FLTK_VERSION OR FLTK_VERSION EQUAL 1.1)
      set_config_option(HAVE_FL_TREE "FlTree")
    endif(ENABLE_FL_TREE)
  endif(HAVE_FLTK)
elseif(ENABLE_QT)
  find_package(Qt4)
  set(QT_USE_QTOPENGL TRUE)
  include(${QT_USE_FILE})
  if(QT_FOUND)
    add_subdirectory(Qt)
    set_config_option(HAVE_QT "Qt")
    list(APPEND EXTERNAL_INCLUDES ${QT_INCLUDE_DIR})
  endif(QT_FOUND)
endif(ENABLE_FLTK)

if(APPLE)
  set(glut "-framework GLUT")
else(APPLE)
  list(APPEND EXTERNAL_LIBRARIES "glut")
endif(APPLE)

  if(ENABLE_MMG3D)
    find_library(MMG3D_LIB mmg3dlib4.0 PATH_SUFFIXES lib)
    find_path(MMG3D_INC "libmmg3d.h" PATH_SUFFIXES src include)
    if(MMG3D_LIB AND MMG3D_INC)
       list(APPEND EXTERNAL_LIBRARIES ${MMG3D_LIB})
       list(APPEND EXTERNAL_INCLUDES ${MMG3D_INC})
    else(MMG3D_LIB AND MMG3D_INC)
       message(STATUS "System MMG3D not found - using contrib/mmg3d instead")
       add_subdirectory(contrib/mmg3d)
       include_directories(contrib/mmg3d/build/sources)
    endif(MMG3D_LIB AND MMG3D_INC)
    set_config_option(HAVE_MMG3D "Mmg3d")
  endif(ENABLE_MMG3D)

  if(ENABLE_TETGEN_NEW AND EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/contrib/TetgenNew/tetgen.h)
    add_subdirectory(contrib/TetgenNew)
    include_directories(contrib/TetgenNew)
    set_config_option(HAVE_TETGEN "Tetgen(New)")
    add_definitions(-DTETLIBRARY)
    message("WARNING: You are including an experimental version of Tetgen "
            "that is KNOWN TO BE BUGGY on 64 bits archs and on WIN32/MSVC.")
  elseif(ENABLE_TETGEN AND EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/contrib/Tetgen/tetgen.h)
    add_subdirectory(contrib/Tetgen)
    include_directories(contrib/Tetgen)
    set_config_option(HAVE_TETGEN "Tetgen")
    add_definitions(-DTETLIBRARY)
  elseif(ENABLE_TETGEN)
    find_library(TETGEN_LIB tet PATH_SUFFIXES lib)
    find_path(TETGEN_INC "tetgen.h" PATH_SUFFIXES src include tetgen)
    if(TETGEN_LIB AND TETGEN_INC)
      list(APPEND EXTERNAL_LIBRARIES ${TETGEN_LIB})
      list(APPEND EXTERNAL_INCLUDES ${TETGEN_INC})
      set_config_option(HAVE_TETGEN "Tetgen")
    endif(TETGEN_LIB AND TETGEN_INC)
  endif(ENABLE_TETGEN_NEW AND EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/contrib/TetgenNew/tetgen.h)
  if(HAVE_TETGEN)
    message("WARNING: By including Tetgen you have to comply with Tetgen's "
            "special licensing requirements stated in contrib/Tetgen/LICENSE.")
  endif(HAVE_TETGEN)

if(ENABLE_MED OR ENABLE_CGNS)
  find_library(HDF5_LIB hdf5)
  if(HDF5_LIB)
    if(ENABLE_MED)
      find_library(MED_LIB med)
      if(MED_LIB)
        set_config_option(HAVE_MED "Med")
        list(APPEND EXTERNAL_LIBRARIES ${MED_LIB})
      endif(MED_LIB)
    endif(ENABLE_MED)    
    if(ENABLE_CGNS)
      find_library(CGNS_LIB cgns PATHS ENV CGNS_ROOT PATH_SUFFIXES lib)
      find_path(CGNS_INC "cgnslib.h" PATHS ENV CGNS_ROOT PATH_SUFFIXES include)
      if(CGNS_LIB)
        set_config_option(HAVE_LIBCGNS "Cgns")
        list(APPEND EXTERNAL_LIBRARIES ${CGNS_LIB})
        list(APPEND EXTERNAL_INCLUDES ${CGNS_INC})
      endif(CGNS_LIB)
    endif(ENABLE_CGNS)    
    if(MED_LIB OR CGNS_LIB)
      list(APPEND EXTERNAL_LIBRARIES ${HDF5_LIB})
      find_library(SZ_LIB NAMES szlib sz)
      if(SZ_LIB)
        list(APPEND EXTERNAL_LIBRARIES ${SZ_LIB})
      endif(SZ_LIB)
      if(NOT HAVE_LIBZ) # necessary for non-GUI builds
        find_package(ZLIB)
        if(ZLIB_FOUND)
          set_config_option(HAVE_LIBZ "Zlib")
          list(APPEND EXTERNAL_LIBRARIES ${ZLIB_LIBRARIES})
        endif(ZLIB_FOUND)
      endif(NOT HAVE_LIBZ)
    endif(MED_LIB OR CGNS_LIB)
  endif(HDF5_LIB)
endif(ENABLE_MED OR ENABLE_CGNS)

if(ENABLE_MESH)
  set_config_option(HAVE_MESH "Mesh")
endif(ENABLE_MESH)

if(ENABLE_POST)
  set_config_option(HAVE_POST "Post")
  if(ENABLE_PLUGINS)
    set_config_option(HAVE_PLUGINS "Plugins")
  endif(ENABLE_PLUGINS)
endif(ENABLE_POST)

if(HAVE_FLTK OR HAVE_QT OR ENABLE_GRAPHICS)
  if(NOT HAVE_MESH OR NOT HAVE_POST OR NOT HAVE_PLUGINS)
    message(SEND_ERROR "Cannot compile GUI without Mesh, Post or Plugin modules")
  endif(NOT HAVE_MESH OR NOT HAVE_POST OR NOT HAVE_PLUGINS)

  if(FLTK_JPEG)
    set_config_option(HAVE_LIBJPEG "Jpeg(Fltk)")
  else(FLTK_JPEG)
    find_package(JPEG)
    if(JPEG_FOUND)
      set_config_option(HAVE_LIBJPEG "Jpeg")
      list(APPEND EXTERNAL_LIBRARIES ${JPEG_LIBRARIES})
      list(APPEND EXTERNAL_INCLUDES ${JPEG_INCLUDE_DIR})
    endif(JPEG_FOUND)
  endif(FLTK_JPEG)

  if(FLTK_Z)
    set_config_option(HAVE_LIBZ "Zlib(Fltk)")
  else(FLTK_Z)
    find_package(ZLIB)
    if(ZLIB_FOUND)
      set_config_option(HAVE_LIBZ "Zlib")
      list(APPEND EXTERNAL_LIBRARIES ${ZLIB_LIBRARIES})
      list(APPEND EXTERNAL_INCLUDES ${ZLIB_INCLUDE_DIR})
    endif(ZLIB_FOUND)
  endif(FLTK_Z)

  if(HAVE_LIBZ)
    if(FLTK_PNG)
      set_config_option(HAVE_LIBPNG "Png(Fltk)")
    else(FLTK_PNG)
      find_package(PNG)
      if(PNG_FOUND)
        set_config_option(HAVE_LIBPNG "Png")
        list(APPEND EXTERNAL_LIBRARIES ${PNG_LIBRARIES})
        list(APPEND EXTERNAL_INCLUDES ${PNG_INCLUDE_DIR})
      endif(PNG_FOUND)
    endif(FLTK_PNG)
  endif(HAVE_LIBZ)

  if(ENABLE_MPEG_ENCODE)
    add_subdirectory(contrib/mpeg_encode)
    include_directories(contrib/mpeg_encode/headers)
    set_config_option(HAVE_MPEG_ENCODE "Mpeg")
  endif(ENABLE_MPEG_ENCODE)

  if(ENABLE_OSMESA)
    find_library(OSMESA_LIB OSMesa)
    if(OSMESA_LIB)
      set_config_option(HAVE_OSMESA "OSMesa")
      list(APPEND EXTERNAL_LIBRARIES ${OSMESA_LIB})
    endif(OSMESA_LIB)
  endif(ENABLE_OSMESA)

  find_package(OpenGL REQUIRED)
  if(OPENGL_GLU_FOUND)
    set_config_option(HAVE_OPENGL "OpenGL")
  else(OPENGL_GLU_FOUND)
    message(SEND_ERROR "Could not find GLU: disabling OpenGL support")
  endif(OPENGL_GLU_FOUND)
endif(HAVE_FLTK OR HAVE_QT OR ENABLE_GRAPHICS)

if(ENABLE_DINTEGRATION)
  include_directories(../contrib/DiscreteIntegration)
  set_config_option(HAVE_DINTEGRATION "DIntegration")
endif(ENABLE_DINTEGRATION)

# process cmake environment variables so we can append them to the -I
# include commands. This is not recommended (we should only use the
# cache variables) but it is very convenient: otherwise we have to
# remember providing the -D... options to cmake for each new build.
set(ENV_CMAKE_PREFIX_PATH $ENV{CMAKE_PREFIX_PATH})
set(ENV_CMAKE_INCLUDE_PATH $ENV{CMAKE_INCLUDE_PATH})
if(UNIX)
  if(ENV_CMAKE_PREFIX_PATH)
    string(REPLACE ":" ";" ENV_CMAKE_PREFIX_PATH ${ENV_CMAKE_PREFIX_PATH})
  endif(ENV_CMAKE_PREFIX_PATH)
  if(ENV_CMAKE_INCLUDE_PATH)
    string(REPLACE ":" ";" ENV_CMAKE_INCLUDE_PATH ${ENV_CMAKE_INCLUDE_PATH})
  endif(ENV_CMAKE_INCLUDE_PATH)
endif(UNIX)
list(APPEND EXTERNAL_INCLUDES ${CMAKE_INCLUDE_PATH} ${ENV_CMAKE_INCLUDE_PATH})
list(APPEND EXTERNAL_INCLUDES ${CMAKE_PREFIX_PATH} ${ENV_CMAKE_PREFIX_PATH})
foreach(DIR ${CMAKE_PREFIX_PATH} ${ENV_CMAKE_PREFIX_PATH})
  list(APPEND EXTERNAL_INCLUDES ${DIR}/include)
endforeach(DIR)

if(EXTERNAL_INCLUDES)
  list(REMOVE_DUPLICATES EXTERNAL_INCLUDES)
endif(EXTERNAL_INCLUDES)

if(HAVE_FLTK)
  set(LINK_LIBRARIES ${FLTK_LIBRARIES} ${EXTERNAL_LIBRARIES} 
                     ${OPENGL_LIBRARIES} ${LAPACK_LIBRARIES})
elseif(HAVE_QT)
  set(LINK_LIBRARIES ${QT_LIBRARIES} ${EXTERNAL_LIBRARIES}
                     ${OPENGL_LIBRARIES} ${LAPACK_LIBRARIES})
elseif(HAVE_OPENGL)
  set(LINK_LIBRARIES ${EXTERNAL_LIBRARIES} ${OPENGL_LIBRARIES}
                     ${LAPACK_LIBRARIES})
else(HAVE_FLTK)
  set(LINK_LIBRARIES ${EXTERNAL_LIBRARIES} ${LAPACK_LIBRARIES})
endif(HAVE_FLTK)

# set this for external codes that might include this CMakeList file
set(GMSH_EXTERNAL_INCLUDE_DIRS ${EXTERNAL_INCLUDES} CACHE 
    STRING "External include directories" FORCE)
set(GMSH_EXTERNAL_LIBRARIES ${EXTERNAL_LIBRARIES} CACHE 
    STRING "External libraries" FORCE)

include_directories(${GMSH_EXTERNAL_INCLUDE_DIRS})

add_executable(mainAntTweakBar mainAntTweakBar.cpp)
target_link_libraries(mainAntTweakBar ${LINK_LIBRARIES})

add_executable(mainCartesian mainCartesian.cpp)
target_link_libraries(mainCartesian ${LINK_LIBRARIES})

add_executable(mainElasticity mainElasticity.cpp)
target_link_libraries(mainElasticity ${LINK_LIBRARIES})

add_executable(mainGlut mainGlut.cpp)
target_link_libraries(mainGlut ${glut} ${LINK_LIBRARIES})

add_executable(mainHomology mainHomology.cpp)
target_link_libraries(mainHomology ${LINK_LIBRARIES})

add_executable(mainLevelset mainLevelset.cpp)
target_link_libraries(mainLevelset ${LINK_LIBRARIES})

add_executable(mainOcc mainOcc.cpp)
target_link_libraries(mainOcc ${LINK_LIBRARIES})

add_executable(mainPost mainPost.cpp)
target_link_libraries(mainPost ${LINK_LIBRARIES})

add_executable(mainSimple mainSimple.cpp)
target_link_libraries(mainSimple ${LINK_LIBRARIES})

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