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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file LICENSE.rst or https://cmake.org/licensing for details.
#[=======================================================================[.rst:
CheckPrototypeDefinition
------------------------
This module provides a command to check if a C function has the expected
prototype.
Load this module in a CMake project with:
.. code-block:: cmake
include(CheckPrototypeDefinition)
Commands
^^^^^^^^
This module provides the following command:
.. command:: check_prototype_definition
Checks if a C function has the expected prototype:
.. code-block:: cmake
check_prototype_definition(<function> <prototype> <return> <headers> <variable>)
``<function>``
The name of the function whose prototype is being checked.
``<prototype>``
The expected prototype of the function, provided as a string.
``<return>``
The return value of the function. This will be used as a return value in
the function definition body of the generated test program to verify that
the function's return type matches the expected type.
``<headers>``
A :ref:`semicolon-separated list <CMake Language Lists>` of header file
names required for checking the function prototype.
``<variable>``
The name of the variable to store the check result. This variable will be
created as an internal cache variable.
This command generates a test program and verifies that it builds without
errors. The generated test program includes specified ``<headers>``, defines
a function with given literal ``<prototype>`` and ``<return>`` value and
then uses the specified ``<function>``. The simplified test program can be
illustrated as:
.. code-block:: c
#include <headers>
// ...
<prototype> { return <return>; }
int main(...) { ...<function>()... }
.. rubric:: Variables Affecting the Check
The following variables may be set before calling this command to modify
the way the check is run:
.. include:: /module/include/CMAKE_REQUIRED_FLAGS.rst
.. include:: /module/include/CMAKE_REQUIRED_DEFINITIONS.rst
.. include:: /module/include/CMAKE_REQUIRED_INCLUDES.rst
.. include:: /module/include/CMAKE_REQUIRED_LINK_OPTIONS.rst
.. include:: /module/include/CMAKE_REQUIRED_LIBRARIES.rst
.. include:: /module/include/CMAKE_REQUIRED_LINK_DIRECTORIES.rst
.. include:: /module/include/CMAKE_REQUIRED_QUIET.rst
Examples
^^^^^^^^
Checking if the ``getpwent_r()`` function on Solaris/illumos systems has the
expected prototype:
.. code-block:: cmake
include(CheckPrototypeDefinition)
check_prototype_definition(
getpwent_r
"struct passwd *getpwent_r(struct passwd *src, char *buf, int buflen)"
"NULL"
"unistd.h;pwd.h"
HAVE_SOLARIS_GETPWENT_R
)
#]=======================================================================]
#
get_filename_component(__check_proto_def_dir "${CMAKE_CURRENT_LIST_FILE}" PATH)
include_guard(GLOBAL)
function(check_prototype_definition _FUNCTION _PROTOTYPE _RETURN _HEADER _VARIABLE)
if (NOT DEFINED ${_VARIABLE})
if(NOT CMAKE_REQUIRED_QUIET)
message(CHECK_START "Checking prototype ${_FUNCTION} for ${_VARIABLE}")
endif()
set(CHECK_PROTOTYPE_DEFINITION_CONTENT "/* */\n")
set(CHECK_PROTOTYPE_DEFINITION_FLAGS ${CMAKE_REQUIRED_FLAGS})
if (CMAKE_REQUIRED_LINK_OPTIONS)
set(CHECK_PROTOTYPE_DEFINITION_LINK_OPTIONS
LINK_OPTIONS ${CMAKE_REQUIRED_LINK_OPTIONS})
else()
set(CHECK_PROTOTYPE_DEFINITION_LINK_OPTIONS)
endif()
if (CMAKE_REQUIRED_LIBRARIES)
set(CHECK_PROTOTYPE_DEFINITION_LIBS
LINK_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
else()
set(CHECK_PROTOTYPE_DEFINITION_LIBS)
endif()
if (CMAKE_REQUIRED_INCLUDES)
set(CMAKE_SYMBOL_EXISTS_INCLUDES
"-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}")
else()
set(CMAKE_SYMBOL_EXISTS_INCLUDES)
endif()
if(CMAKE_REQUIRED_LINK_DIRECTORIES)
set(_CPD_LINK_DIRECTORIES
"-DLINK_DIRECTORIES:STRING=${CMAKE_REQUIRED_LINK_DIRECTORIES}")
else()
set(_CPD_LINK_DIRECTORIES)
endif()
foreach(_FILE ${_HEADER})
string(APPEND CHECK_PROTOTYPE_DEFINITION_HEADER
"#include <${_FILE}>\n")
endforeach()
set(CHECK_PROTOTYPE_DEFINITION_SYMBOL ${_FUNCTION})
set(CHECK_PROTOTYPE_DEFINITION_PROTO ${_PROTOTYPE})
set(CHECK_PROTOTYPE_DEFINITION_RETURN ${_RETURN})
file(READ ${__check_proto_def_dir}/CheckPrototypeDefinition.c.in _SOURCE)
string(CONFIGURE "${_SOURCE}" _SOURCE @ONLY)
try_compile(${_VARIABLE}
SOURCE_FROM_VAR CheckPrototypeDefinition.c _SOURCE
COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
${CHECK_PROTOTYPE_DEFINITION_LINK_OPTIONS}
${CHECK_PROTOTYPE_DEFINITION_LIBS}
CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${CHECK_PROTOTYPE_DEFINITION_FLAGS}
"${CMAKE_SYMBOL_EXISTS_INCLUDES}"
"${_CPD_LINK_DIRECTORIES}"
)
unset(_CPD_LINK_DIRECTORIES)
if (${_VARIABLE})
set(${_VARIABLE} 1 CACHE INTERNAL "Have correct prototype for ${_FUNCTION}")
if(NOT CMAKE_REQUIRED_QUIET)
message(CHECK_PASS "True")
endif()
else ()
if(NOT CMAKE_REQUIRED_QUIET)
message(CHECK_FAIL "False")
endif()
set(${_VARIABLE} 0 CACHE INTERNAL "Have correct prototype for ${_FUNCTION}")
endif ()
endif()
endfunction()
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