path: root/release_docs/USING_HDF5_CMake.txt

************************************************************************
* Build and Install HDF5 Applications with CMake                       *
************************************************************************

Notes: This short instruction is written for users who want to quickly 
       build HDF5 applications using the CMake tools. Users can adapt 
       these instructions for their own applications. For more information, 
       see the "Minimum C Project Files for CMake" section.
       
       More information about using CMake can be found at the KitWare 
       site, www.cmake.org.
         
       CMake uses the command line; however, the visual CMake tool is 
       available for the configuration step. The steps are similar for
       all of the operating systems supported by CMake.
       
       NOTES:
         1. Using CMake for building and using HDF5 is under active 
            development. While we have attempted to provide error-free 
            files, please understand that development with CMake has not 
            been extensively tested outside of HDF. The CMake specific 
            files may change before the next release.
            
         2. CMake for HDF5 development should be usable on any system 
            where CMake is supported. Please send us any comments on how 
            CMake support can be improved on any system. 
            
         3. See the appendix at the bottom of this file for an example 
            of using a ctest script for building and testing. See 
            INSTALL_CMake.txt for more information.



========================================================================
I. Preconditions                                                           
========================================================================

   1. We suggest you obtain the latest CMake for windows from the Kitware
      web site. The HDF5 1.8.x product requires a minimum CMake version 
      of 3.1.0.                     
                                                                         
   2. You have installed the HDF5 library built with CMake, by executing 
      the HDF Install Utility (the *.exe file in the binary package for 
      Windows). If you are using a Windows platform, you can obtain a 
      pre-built Windows binary from The HDF Group's website at 
      www.hdfgroup.org.

   3. Set the environment variable HDF5_DIR to the installed location of 
      the config files for HDF5. On Windows: 
            HDF5_DIR=C:/Program Files/HDF_Group/HDF5/1.8.x/cmake/hdf5
      
      (Note there are no quote characters used on Windows and all platforms
      use forward slashes)

   4. Created separate source and build directories.
      (CMake commands are executed in the build directory)

   5. Created a CMakeLists.txt file(s) for your source. See Section III 
      below.



========================================================================
II. Building HDF5 Applications with CMake
========================================================================

Go through these steps to build HDF5 applications with CMake.

   1. Run CMake
   2. Configure the cache settings
   3. Build HDF5 Applications
   4. Test HDF5 Applications

These steps are described in more detail below.



   1. Run CMake

      The visual CMake executable is named "cmake-gui.exe" on Windows and should be
      available in your Start menu. For Linux, UNIX, and Mac users the
      executable is named "cmake-gui" and can be found where CMake was 
      installed. 
      
      Specify the source and build directories. Make the build and source 
      directories different. For example on Windows, if the source is at 
      c:\MyHDFstuff\hdf5, then use c:\MyHDFstuff\hdf5\build or 
      c:\MyHDFstuff\build\hdf5 for the build directory. 
      
      PREFERRED:
        Users can perform the configuration step without using the visual 
        cmake-gui program. The following is an example command line 
        configuration step executed within the build directory:
        
        cmake -G "<generator>"  [-D<options>]  <sourcepath>
        
        Where <generator> is    
            * MinGW Makefiles
            * NMake Makefiles
            * Unix Makefiles
            * Visual Studio 12
            * Visual Studio 12 Win64
            * Visual Studio 11
            * Visual Studio 11 Win64
            * Visual Studio 10
            * Visual Studio 10 Win64

        <options> is:
            * BUILD_TESTING:BOOL=ON
            * USE_SHARED_LIBS:BOOL=[ON | OFF]

   2. Configure the cache settings

      2.1  Visual CMake users, click the Configure button. If this is the first time you are 
           running cmake-gui in this directory, you will be prompted for the 
           generator you wish to use (for example on Windows, Visual Studio 10). 
           CMake will read in the CMakeLists.txt files from the source directory and 
           display options for the HDF5 project. After the first configure you 
           can adjust the cache settings and/or specify locations of other programs.
      
           Any conflicts or new values will be highlighted by the configure
           process in red. Once you are happy with all the settings and there are no 
           more values in red, click the Generate button to produce the appropriate 
           build files. 
      
           On Windows, if you are using a Visual Studio generator, the solution and 
           project files will be created in the build folder.
      
           On linux, if you are using the Unix Makefiles generator, the Makefiles will
           be created in the build folder.

      2.2  Alternative command line example on Windows in c:\MyHDFstuff\hdf5\build directory:
      
           cmake -G "Visual Studio 11" -DBUILD_TESTING:BOOL=ON -DUSE_SHARED_LIBS:BOOL=ON ..

   3. Build HDF5 Applications
   
      On Windows, you can build HDF5 applications using either the Visual Studio Environment 
      or the command line. The command line is normally used on linux, Unix, and Mac.

      To build from the command line, navigate to your build directory and
      execute the following:
          
              cmake --build . --config {Debug | Release}     
              
      NOTE: "--config {Debug | Release}" may be optional on your platform. We
            recommend choosing either Debug or Release on Windows. If you are
            using the pre-built binaries from HDF, use Release.                                                                                     
             
      3.1  If you wish to use the Visual Studio environment, open the solution 
           file in your build directory. Be sure to select either Debug or 
           Release and build the solution.
             
   4. Test HDF5 Applications

      To test the build, navigate to your build directory and execute:
      
              ctest . -C {Debug | Release}
              
      NOTE: "-C {Debug | Release}" may be optional on your platform. We
            recommend choosing either Debug or Release to match the build
            step on Windows.                                                                                      

   5. The files that support building with CMake are all of the files in the 
      config/cmake folder, the CMakeLists.txt files in each source folder, and 
      CTestConfig.cmake. CTestConfig.cmake is specific to the internal testing 
      performed by The HDF Group. It should be altered for the user's 
      installation and needs. The cacheinit.cmake file settings are used by
      The HDF Group for daily testing. It should be altered/ignored for the user's 
      installation and needs. 



========================================================================
III. Minimum C Project Files for CMake
========================================================================

Create a CMakeLists.txt file at the source root. Include the 
following text in the file:

##########################################################
cmake_minimum_required (VERSION 3.1.0)
PROJECT (HDF5MyApp C CXX)

FIND_PACKAGE (HDF5 NAMES hdf5)
# FIND_PACKAGE (HDF5) # Find non-cmake built HDF5
INCLUDE_DIRECTORIES (${HDF5_INCLUDE_DIR})
set (LINK_LIBS ${LINK_LIBS} ${HDF5_LIBRARIES})

set (example hdf_example)

add_executable (${example} ${PROJECT_SOURCE_DIR}/${example}.c)
TARGET_C_PROPERTIES (${example} " " " ")
target_link_libraries (${example} ${LINK_LIBS})

ENABLE_TESTING ()
include (CTest)

add_test (NAME test_example COMMAND ${example})
##########################################################



========================================================================
IV. APPENDIX
========================================================================

Below is an example of the ctest script used by The HDF Group. See the
Appendix in the INSTALL_CMake.txt file for the CTestScript.cmake file used
by this script. Adjust the values as necessary. Note that the source folder
is entered on the command line and the build folder is created as a sub-folder.
Windows should adjust the forward slash to double backslashes, except for
the HDF_DIR environment variable.

NOTE: these files are available at the HDF web site:
    http://www.hdfgroup.org/HDF5/release/cmakebuild.html

    CTestScript.cmake
    
    HDF518ExamplesWindowsbinaryCMake.cmake



========================================================================
ctest
========================================================================

############################################################################
# Product specific script, HDF518Example.cmake, that uses the 
# CTestScript.cmake file (see Appendix in the CMake.txt). Usage:
# "ctest -S HDF518Example.cmake,hdf518Examples -C Release -O hdf518EX.log"
# where hdf518Examples is the source folder relative to the location of these scripts
############################################################################

cmake_minimum_required(VERSION 3.1.0 FATAL_ERROR)

set(CTEST_DASHBOARD_ROOT ${CTEST_SCRIPT_DIRECTORY})
set(CTEST_SOURCE_NAME ${CTEST_SCRIPT_ARG})
set(CTEST_BINARY_NAME ${CTEST_SOURCE_NAME}/build)
set(CTEST_SOURCE_DIRECTORY "${CTEST_DASHBOARD_ROOT}/${CTEST_SOURCE_NAME}")
set(CTEST_BINARY_DIRECTORY "${CTEST_DASHBOARD_ROOT}/${CTEST_BINARY_NAME}")
set(CTEST_BUILD_CONFIGURATION "Release")
set(MODEL "Experimental")

# build generator name, see cmake generator list
set(CTEST_CMAKE_GENERATOR "Unix Makefiles")

# machine description, can be removed on linux
set(CTEST_SITE "machine.domain")
set(SITE_OS_NAME "os name")
set(SITE_OS_VERSION "os version")
set(SITE_OS_BITS "os size")
set(SITE_COMPILER_NAME "compiler name")
set(SITE_COMPILER_VERSION "compiler version")

# needed for source updates, change as required
set(REPOSITORY_URL "http://svn.${hdfgroup_url}/hdf5-examples/trunk/1_8")

set(ADD_BUILD_OPTIONS "${ADD_BUILD_OPTIONS} -DCMAKE_INSTALL_PREFIX:PATH=/usr/local/hdf5Examples-1.8")

# location of the installed hdf5 (cmake configuration folder)
set(ENV{HDF5_DIR} "/usr/share/cmake/hdf5")

include(${CTEST_SCRIPT_DIRECTORY}/CTestScript.cmake)

message("DONE")
#################################################################################



========================================================================
For further assistance, send email to help@hdfgroup.org
========================================================================