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e6f9ebbbe1
Changes: - Added intro code blocks showing how to include these modules. - Added examples sections. - Used "command" instead of "macro". - Commands sections added to have a clearer overview of the modules at first encounter. - Reworded commands arguments a bit. - Added a rubric title for variables that affect the checks. - CheckFortranSourceCompiles: Added CMake version when SRC_EXT option was introduced. - Listed CMAKE_TRY_COMPILE_TARGET_TYPE variable in the rubric together with CMAKE_REQUIRED_* variables and added an include RST file for it. - Used lowercase style for check_fortran_source_compiles().
111 lines
3.2 KiB
CMake
111 lines
3.2 KiB
CMake
# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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# file LICENSE.rst or https://cmake.org/licensing for details.
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#[=======================================================================[.rst:
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CheckOBJCXXSourceCompiles
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-------------------------
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.. versionadded:: 3.16
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This module provides a command to check whether an Objective-C++ source can
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be built.
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Load this module in a CMake project with:
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.. code-block:: cmake
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include(CheckOBJCXXSourceCompiles)
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Commands
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^^^^^^^^
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This module provides the following command:
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.. command:: check_objcxx_source_compiles
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Checks once whether the given Objective-C++ source code can be built:
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.. code-block:: cmake
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check_objcxx_source_compiles(<code> <variable> [FAIL_REGEX <regexes>...])
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This command checks once that the source supplied in ``<code>`` can be
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compiled (and linked into an executable). The result of the check is
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stored in the internal cache variable specified by ``<variable>``.
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The arguments are:
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``<code>``
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Objective-C++ source code to check. This must be an entire program, as
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written in a file containing the body block. All symbols used in the
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source code are expected to be declared as usual in their corresponding
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headers.
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``<variable>``
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Variable name of an internal cache variable to store the result of the
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check, with boolean true for success and boolean false for failure.
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``FAIL_REGEX <regexes>...``
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If this option is provided with one or more regular expressions, then
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failure is determined by checking if anything in the compiler output
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matches any of the specified regular expressions.
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.. rubric:: Variables Affecting the Check
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The following variables may be set before calling this command to modify
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the way the check is run:
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.. include:: /module/include/CMAKE_REQUIRED_FLAGS.rst
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.. include:: /module/include/CMAKE_REQUIRED_DEFINITIONS.rst
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.. include:: /module/include/CMAKE_REQUIRED_INCLUDES.rst
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.. include:: /module/include/CMAKE_REQUIRED_LINK_OPTIONS.rst
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.. include:: /module/include/CMAKE_REQUIRED_LIBRARIES.rst
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.. include:: /module/include/CMAKE_REQUIRED_LINK_DIRECTORIES.rst
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.. include:: /module/include/CMAKE_REQUIRED_QUIET.rst
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.. include:: /module/include/CMAKE_TRY_COMPILE_TARGET_TYPE.rst
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Examples
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^^^^^^^^
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In the following example, this module is used to check whether the provided
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Objective-C++ source code can be compiled and linked. Result of the check
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is stored in the internal cache variable ``HAVE_WORKING_CODE``.
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.. code-block:: cmake
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include(CheckOBJCXXSourceCompiles)
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check_objcxx_source_compiles("
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#include <vector>
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#import <Foundation/Foundation.h>
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int main()
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{
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std::vector<int> v;
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NSObject *foo;
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return 0;
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}
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" HAVE_WORKING_CODE)
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See Also
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^^^^^^^^
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* The :module:`CheckSourceCompiles` module for a more general command to
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check whether source can be built.
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* The :module:`CheckSourceRuns` module to check whether source can be built
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and run.
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#]=======================================================================]
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include_guard(GLOBAL)
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include(Internal/CheckSourceCompiles)
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macro(CHECK_OBJCXX_SOURCE_COMPILES SOURCE VAR)
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cmake_check_source_compiles(OBJCXX "${SOURCE}" ${VAR} ${ARGN})
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endmacro()
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