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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.
#.rst:
# CheckPrototypeDefinition
# ------------------------
#
# Check if the prototype we expect is correct.
#
# check_prototype_definition(FUNCTION PROTOTYPE RETURN HEADER VARIABLE)
#
# ::
#
# FUNCTION - The name of the function (used to check if prototype exists)
# PROTOTYPE- The prototype to check.
# RETURN - The return value of the function.
# HEADER - The header files required.
# VARIABLE - The variable to store the result.
# Will be created as an internal cache variable.
#
# Example:
#
# ::
#
# check_prototype_definition(getpwent_r
# "struct passwd *getpwent_r(struct passwd *src, char *buf, int buflen)"
# "NULL"
# "unistd.h;pwd.h"
# SOLARIS_GETPWENT_R)
#
# The following variables may be set before calling this macro to modify
# the way the check is run:
#
# ::
#
# CMAKE_REQUIRED_FLAGS = string of compile command line flags
# CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
# CMAKE_REQUIRED_INCLUDES = list of include directories
# CMAKE_REQUIRED_LIBRARIES = list of libraries to link
# CMAKE_REQUIRED_QUIET = execute quietly without messages
#
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})
set(CHECK_PROTOTYPE_DEFINITION_CONTENT "/* */\n")
set(CHECK_PROTOTYPE_DEFINITION_FLAGS ${CMAKE_REQUIRED_FLAGS})
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()
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 ${_RETURN})
configure_file("${__check_proto_def_dir}/CheckPrototypeDefinition.c.in"
"${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckPrototypeDefinition.c" @ONLY)
file(READ ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckPrototypeDefinition.c _SOURCE)
try_compile(${_VARIABLE}
${CMAKE_BINARY_DIR}
${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckPrototypeDefinition.c
COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
${CHECK_PROTOTYPE_DEFINITION_LIBS}
CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${CHECK_PROTOTYPE_DEFINITION_FLAGS}
"${CMAKE_SYMBOL_EXISTS_INCLUDES}"
OUTPUT_VARIABLE OUTPUT)
if (${_VARIABLE})
set(${_VARIABLE} 1 CACHE INTERNAL "Have correct prototype for ${_FUNCTION}")
if(NOT CMAKE_REQUIRED_QUIET)
message(STATUS "Checking prototype ${_FUNCTION} for ${_VARIABLE} - True")
endif()
file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
"Determining if the prototype ${_FUNCTION} exists for ${_VARIABLE} passed with the following output:\n"
"${OUTPUT}\n\n")
else ()
if(NOT CMAKE_REQUIRED_QUIET)
message(STATUS "Checking prototype ${_FUNCTION} for ${_VARIABLE} - False")
endif()
set(${_VARIABLE} 0 CACHE INTERNAL "Have correct prototype for ${_FUNCTION}")
file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
"Determining if the prototype ${_FUNCTION} exists for ${_VARIABLE} failed with the following output:\n"
"${OUTPUT}\n\n${_SOURCE}\n\n")
endif ()
endif()
endfunction()
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