ctest_build
-----------

Build the project.

::

  ctest_build([BUILD build_dir] [TARGET target] [RETURN_VALUE res]
              [APPEND][NUMBER_ERRORS val] [NUMBER_WARNINGS val])

Builds the given build directory and stores results in Build.xml.  If no
``BUILD`` is given, the :variable:`CTEST_BINARY_DIRECTORY` variable is used.

The ``TARGET`` variable can be used to specify a build target.  If none is
specified, the default target ("ALL_BUILD" for Visual Studio generators and
"all" in others) will be built.

The ``RETURN_VALUE`` option specifies a variable in which to store the
return value of the native build tool.  The ``NUMBER_ERRORS`` and
``NUMBER_WARNINGS`` options specify variables in which to store the number
of build errors and warnings detected.

The ``APPEND`` option marks results for append to those previously
submitted to a dashboard server since the last :command:`ctest_start`.  Append
semantics are defined by the dashboard server in use.

The ``QUIET`` option suppresses any CTest-specific non-error output
that would have been printed to the console otherwise.  The summary
of warnings / errors, as well as the output from the native build tool
is unaffected by this option.

If set, the contents of the variable ``CTEST_BUILD_COMMAND`` is used to build
the project. In addition, if set, the contents of the variable
``CTEST_BUILD_FLAGS`` are passed as additional arguments to the underlying
build command. This can, e.g., be used to trigger a parallel build using the
``-j`` option of make. See :module:`ProcessorCount` for an example.