#
# $Id: CheckPrototypeExists.cmake 12822 2014-01-31 23:39:56Z remko $
#
# - Check if the prototype for a function exists.
# CHECK_PROTOTYPE_EXISTS (FUNCTION HEADER VARIABLE)
#
#  FUNCTION - the name of the function you are looking for
#  HEADER - the header(s) where the prototype should be declared
#  VARIABLE - variable to store the result
#
# 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

# Copyright (c) 2006, Alexander Neundorf, <neundorf@kde.org>
#
# Redistribution and use is allowed according to the terms of the BSD license.
# For details see the accompanying COPYING-CMAKE-SCRIPTS file.


INCLUDE(CheckCSourceCompiles)

MACRO (CHECK_PROTOTYPE_EXISTS _SYMBOL _HEADER _RESULT)
	SET(_INCLUDE_FILES)
	FOREACH (it ${_HEADER})
		SET(_INCLUDE_FILES "${_INCLUDE_FILES}#include <${it}>\n")
	ENDFOREACH (it)
	
	SET(_CHECK_PROTO_EXISTS_SOURCE_CODE "
${_INCLUDE_FILES}
int main()
{
#ifndef ${_SYMBOL}
	int i = sizeof(&${_SYMBOL});
#endif
	return 0;
}
")
	CHECK_CXX_SOURCE_COMPILES("${_CHECK_PROTO_EXISTS_SOURCE_CODE}" ${_RESULT})
ENDMACRO (CHECK_PROTOTYPE_EXISTS _SYMBOL _HEADER _RESULT)
