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# - 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_C_SOURCE_COMPILES("${_CHECK_PROTO_EXISTS_SOURCE_CODE}" ${_RESULT})
ENDMACRO (CHECK_PROTOTYPE_EXISTS _SYMBOL _HEADER _RESULT)
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