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# - Check if the protoype 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.
#
# 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
function(CHECK_PROTOTYPE_DEFINITION _FUNCTION _PROTOTYPE _RETURN _HEADER _VARIABLE)
if ("${_VARIABLE}" MATCHES "^${_VARIABLE}$")
set(CHECK_PROTOTYPE_DEFINITION_CONTENT "/* */\n")
set(CHECK_PROTOTYPE_DEFINITION_FLAGS ${CMAKE_REQUIRED_FLAGS})
if (CMAKE_REQUIRED_LIBRARIES)
set(CHECK_PROTOTYPE_DEFINITION_LIBS
"-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES}")
else(CMAKE_REQUIRED_LIBRARIES)
set(CHECK_PROTOTYPE_DEFINITION_LIBS)
endif(CMAKE_REQUIRED_LIBRARIES)
if (CMAKE_REQUIRED_INCLUDES)
set(CMAKE_SYMBOL_EXISTS_INCLUDES
"-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}")
else(CMAKE_REQUIRED_INCLUDES)
set(CMAKE_SYMBOL_EXISTS_INCLUDES)
endif(CMAKE_REQUIRED_INCLUDES)
foreach(_FILE ${_HEADER})
set(CHECK_PROTOTYPE_DEFINITION_HEADER
"${CHECK_PROTOTYPE_DEFINITION_HEADER}#include <${_FILE}>\n")
endforeach(_FILE)
set(CHECK_PROTOTYPE_DEFINITION_SYMBOL ${_FUNCTION})
set(CHECK_PROTOTYPE_DEFINITION_PROTO ${_PROTOTYPE})
set(CHECK_PROTOTYPE_DEFINITION_RETURN ${_RETURN})
configure_file("${PROJECT_SOURCE_DIR}/cmake/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 ${CMAKE_REQUIRED_DEFINITIONS}
CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${CHECK_PROTOTYPE_DEFINITION_FLAGS}
"${CHECK_PROTOTYPE_DEFINITION_LIBS}"
"${CMAKE_SYMBOL_EXISTS_INCLUDES}"
OUTPUT_VARIABLE OUTPUT)
if (${_VARIABLE})
set(${_VARIABLE} 1 CACHE INTERNAL "Have correct prototype for ${_FUNCTION}")
message(STATUS "Checking prototype ${_FUNCTION} for ${_VARIABLE} - True")
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 (${_VARIABLE})
message(STATUS "Checking prototype ${_FUNCTION} for ${_VARIABLE} - False")
set(${_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${_SOURCE}\n\n")
endif (${_VARIABLE})
endif("${_VARIABLE}" MATCHES "^${_VARIABLE}$")
endfunction(CHECK_PROTOTYPE_DEFINITION)
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