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b88b7e7c18
Teach our CMake lexer to recognize `[[...]]` multi-line strings, as used in some 'check source compiles/runs' examples to pass literal C/C++ code through a CMake function. Previously, this resulted in the lexer trying to parse such code as CMake, which is obviously incorrect. Also, use the new `[[` syntax in more places. Note that, because `[[...]]` can also show up in some instances denoting optional arguments, we only consider `[[` with no `=` as a string if the `[[` is followed by a non-identifier character. This heuristic seems to work for most existing usages. Co-Authored-By: Georg Brandl <georg@python.org>
105 lines
3.1 KiB
CMake
105 lines
3.1 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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CheckCXXSourceCompiles
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----------------------
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This module provides a command to check whether a C++ source can 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(CheckCXXSourceCompiles)
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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_cxx_source_compiles
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Checks once whether the given C++ source code can be built:
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.. code-block:: cmake
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check_cxx_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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C++ source code to check. This must be an entire program, as written
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in a file containing the body block. All symbols used in the source code
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are expected to be declared as usual in their corresponding 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 one or more regular expression patterns are provided, then failure is
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determined by checking if anything in the compiler output matches any of
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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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The following example demonstrates how to check whether the C++ compiler
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supports a specific language feature. In this case, the check verifies if
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the compiler supports ``C++11`` lambda expressions. The result is stored
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in the internal cache variable ``HAVE_CXX11_LAMBDAS``:
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.. code-block:: cmake
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include(CheckCXXSourceCompiles)
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check_cxx_source_compiles([[
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int main()
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{
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auto lambda = []() { return 42; };
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return lambda();
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}
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]] HAVE_CXX11_LAMBDAS)
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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_CXX_SOURCE_COMPILES SOURCE VAR)
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cmake_check_source_compiles(CXX "${SOURCE}" ${VAR} ${ARGN})
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endmacro()
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