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====== CMake tutorial ======
CMake is a cross-platform build system with many nice features.
It generates platform specific build files, such as Makefiles or Visual Studio project files during configuration.

It supports multiple targets, e.g. out-of-tree configurations and builds (simply configure from multiple build directories).
===== Developers =====
To add new files to be compiled, you will need to edit one of the following files
  oofem/src/oofemlib/CMakeLists.txt
  oofem/src/sm/CMakeLists.txt
  oofem/src/fm/CMakeLists.txt
  oofem/src/tm/CMakeLists.txt

Add new files to new lines which makes it less likely to conflict when merging code in git.

  set (oofemlib_element
      element.C
      structuralelement.C
      nlstructuralelement.C
      my_new_element.C
      )

For more complex additions that require new configuration options, you will need to modify CMakeLists.txt in the root directory
  oofem/CMakeLists.txt

If new tests files are added CMake will find them automatically, just re-run cmake from the build directory.
===== Linux =====
Install CMake from the package system of your choice.
Create an out-of-tree build directory:

  mkdir -p ~/build/debug/
  cd ~/build/debug/
  cmake ~/oofem/
  make
  ctest

Instead of ''cmake'' you can use ''ccmake'' which uses an ncurses interface, or ''cmake-gui'' for a GUI.
Use the command ''make help'' for a list of all targets.

To make configuration options, either use the ''cmake'', ''cmake-gui'' or supply additional commands directly
  cmake -DCMAKE_CXX_FLAGS="-Werror" ~/oofem/
  
In order to use a different compiler you need to start a new clean configuration (from an empty directory) and supply the new compiler using ''-DCMAKE_CXX_COMPILER''
  mkdir -p ~/build/clang/
  cd ~/build/clang/
  cmake -DCMAKE_CXX_COMPILER=clang++ ~/oofem/
  make
  ctest
//**Note:** After initial configuration, you cannot change compiler. If you install a new version of GCC, you will need to remove the build directory and do the configuration again. Just doing ''make clean'' isn't enough.//

=== Tips: ===
* The build process usually hides the compiler command lines, to show them, use

   $ make VERBOSE=1

==== CTest ====
Some useful options for ctest include running the tests in parallel;
  ctest -j 4
and regex search for limiting the tests you wish to check (the following example runs //cemhyd01.in// and //cemhyd02.in//)
  ctest -R cemhyd
and lastly a verbose option to see what went wrong
  ctest -V

==== CPack ====
CPack allows you to make source and binary releases. You will first need to configure using ''cmake'' (as detailed above). The following commands are executed from the build directory.

To generate a source package (which excludes .git/ and generated files) run
  make source_package

To generate a DEB, RPM, ZIP binary packages of your currently configured directory, run
  cpack -G DEB
  cpack -G RPM
  cpack -G ZIP
  ...
  
==== KDevelop ====
The KDevelop IDE has build in support for CMake projects (and GIT). It includes a graphical configuration of multiple targets. Simply choose to import a project, and select CMakeLists.txt from the source directory
You can then open the configuration from the menu and make your choices:

{{:kdevelop_cmake.png}}

==== Python bindings ====
With CMake, it is also possible to create shared library loadable as Python module. You need CMake version at least 2.8.8 and two additional cmake parameters ( ''-DUSE_SHARED_LIB=ON'' and ''-DUSE_PYTHON_BINDINGS=ON'' ). After standard ''make'' procedure, ''liboofem.so'' file is created in ''build'' directory. From python it can be loaded and use like this:
  import sys
  sys.path.append("/path/to/build/directory") # path where liboofem.so was created
  import liboofem
  
  a = liboofem.FloatArray(2)
  a[1] = 15.0
  a[0] = 10.0
  print a[0], a[1]

  
===== Windows (Visual Studio) =====
  - Install CMake
  - Start CMake, select the source directory, and then select a new directory for the build.
  - Press configure, select your options, configure again
  - Press generate to produce project files for VS.

To run the test suite, open the solution explorer in VS and "build" the ''tests'' or ''benchmarks'' targets to run through the test suite or benchmark suite respectively.

//**Note:** The build types (debug, release) are handled internally by Visual Studio, so no configuration option for this is presented in CMake//

//**Note:** PETSc isn't easily built on windows, so support for parallel builds is still lacking//