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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>
91 lines
2.6 KiB
CMake
91 lines
2.6 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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CheckCSourceRuns
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----------------
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This module provides a command to check whether a C source can be built and
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run.
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Load this module in a CMake project with:
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.. code-block:: cmake
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include(CheckCSourceRuns)
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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_c_source_runs
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Checks once whether the given C source code compiles and links into an
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executable that can subsequently be run:
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.. code-block:: cmake
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check_c_source_runs(<code> <variable>)
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The C source supplied in ``<code>`` must contain at least a ``main()``
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function. The result of the check is stored in the internal cache variable
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specified by ``<variable>``. If the code builds and runs with exit code
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``0``, success is indicated by a boolean true value. Failure to build or
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run is indicated by a boolean false value, such as an empty string or an
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error message.
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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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Examples
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^^^^^^^^
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The following example demonstrates how to use this module to check whether
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the C source code is supported and operational at runtime. The result of
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the check is stored in the internal cache variable ``HAVE_NORETURN``.
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.. code-block:: cmake
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include(CheckCSourceRuns)
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check_c_source_runs([[
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#include <stdlib.h>
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#include <stdnoreturn.h>
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noreturn void f(){ exit(0); }
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int main(void) { f(); return 1; }
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]] HAVE_NORETURN)
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See Also
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^^^^^^^^
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* The :module:`CheckSourceRuns` module for a more general command syntax.
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* The :module:`CheckSourceCompiles` module to check whether a source code
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can be built.
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#]=======================================================================]
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include_guard(GLOBAL)
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include(Internal/CheckSourceRuns)
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macro(CHECK_C_SOURCE_RUNS SOURCE VAR)
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set(_CheckSourceRuns_old_signature 1)
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cmake_check_source_runs(C "${SOURCE}" ${VAR} ${ARGN})
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unset(_CheckSourceRuns_old_signature)
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endmacro()
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