cmake - CMake build element

This is a BuildElement implementation for using the CMake build system.

You will often want to pass additional arguments to the cmake program for specific configuration options. This should be done on a per-element basis by setting the cmake-local variable. Here is an example:

variables:
  cmake-local: |
    -DCMAKE_BUILD_TYPE=Debug

If you want to pass extra options to cmake for every element in your project, set the cmake-global variable in your project.conf file. Here is an example of that:

elements:
  cmake:
    variables:
      cmake-global: |
        -DCMAKE_BUILD_TYPE=Release

Here is the default configuration for the cmake element in full:

# CMake default configuration

variables:

  build-dir: _builddir

  # Project-wide extra arguments to be passed to `cmake`
  cmake-global: ''

  # Element-specific extra arguments to be passed to `cmake`.
  cmake-local: ''

  # For backwards compatibility only, do not use.
  cmake-extra: ''

  # The cmake generator to use
  generator: Unix Makefiles

  cmake-args: |

    -DCMAKE_INSTALL_PREFIX:PATH="%{prefix}" \
    -DCMAKE_INSTALL_LIBDIR=%{lib} %{cmake-extra} %{cmake-global} %{cmake-local}

  cmake: |

    cmake -B%{build-dir} -H. -G"%{generator}" %{cmake-args}

  make: cmake --build %{build-dir} -- ${JOBS}
  make-install: env DESTDIR="%{install-root}" cmake --build %{build-dir} --target install

  # Set this if the sources cannot handle parallelization.
  #
  # notparallel: True

config:

  # Commands for configuring the software
  #
  configure-commands:
  - |
    %{cmake}

  # Commands for building the software
  #
  build-commands:
  - |
    %{make}

  # Commands for installing the software into a
  # destination folder
  #
  install-commands:
  - |
    %{make-install}

  # Commands for stripping debugging information out of
  # installed binaries
  #
  strip-commands:
  - |
    %{strip-binaries}

# Use max-jobs CPUs for building and enable verbosity
environment:
  JOBS: -j%{max-jobs}
  V: 1

# And dont consider JOBS or V as something which may
# effect build output.
environment-nocache:
- JOBS
- V