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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
#
INCLUDE(CheckCXXSourceCompiles)
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}
void cmakeRequireSymbol(int dummy,...){(void)dummy;}
int main()
{
#ifndef ${_SYMBOL}
#ifndef _MSC_VER
cmakeRequireSymbol(0,&${_SYMBOL});
#else
char i = sizeof(&${_SYMBOL});
#endif
#endif
return 0;
}
")
CHECK_CXX_SOURCE_COMPILES("${_CHECK_PROTO_EXISTS_SOURCE_CODE}" ${_RESULT})
ENDMACRO(CHECK_PROTOTYPE_EXISTS _SYMBOL _HEADER _RESULT)
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