cmake/Modules/CheckCXXSourceRuns.cmake

# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.

#[=======================================================================[.rst:
CheckCXXSourceRuns
------------------

Check if given C++ source compiles and links into an executable and can
subsequently be run.

.. command:: check_cxx_source_runs

  .. code-block:: cmake

    check_cxx_source_runs(<code> <resultVar>)

  Check that the source supplied in ``<code>`` can be compiled as a C++ source
  file, linked as an executable and then run. The ``<code>`` must contain at
  least a ``main()`` function. If the ``<code>`` could be built and run
  successfully, the internal cache variable specified by ``<resultVar>`` will
  be set to 1, otherwise it will be set to an value that evaluates to boolean
  false (e.g. an empty string or an error message).

  The check is only performed once, with the result cached in the variable named
  by ``<resultVar>``. Every subsequent CMake run will re-use this cached value
  rather than performing the check again, even if the ``<code>`` changes. In
  order to force the check to be re-evaluated, the variable named by
  ``<resultVar>`` must be manually removed from the cache.

  The compile and link commands can be influenced by setting any of the
  following variables prior to calling ``check_cxx_source_runs()``:

.. include:: /module/CMAKE_REQUIRED_FLAGS.txt

.. include:: /module/CMAKE_REQUIRED_DEFINITIONS.txt

.. include:: /module/CMAKE_REQUIRED_INCLUDES.txt

.. include:: /module/CMAKE_REQUIRED_LINK_OPTIONS.txt

.. include:: /module/CMAKE_REQUIRED_LIBRARIES.txt

.. include:: /module/CMAKE_REQUIRED_QUIET.txt

#]=======================================================================]

include_guard(GLOBAL)
include(Internal/CheckSourceRuns)

macro(CHECK_CXX_SOURCE_RUNS SOURCE VAR)
  set(_CheckSourceRuns_old_signature 1)
  cmake_check_source_runs(CXX "${SOURCE}" ${VAR} ${ARGN})
  unset(_CheckSourceRuns_old_signature)
endmacro()