1 # - Check if the prototype for a function exists. 2 # CHECK_PROTOTYPE_EXISTS (FUNCTION HEADER VARIABLE) 3 # 4 # FUNCTION - the name of the function you are looking for 5 # HEADER - the header(s) where the prototype should be declared 6 # VARIABLE - variable to store the result 7 # 8 # The following variables may be set before calling this macro to 9 # modify the way the check is run: 10 # 11 # CMAKE_REQUIRED_FLAGS = string of compile command line flags 12 # CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar) 13 # CMAKE_REQUIRED_INCLUDES = list of include directories 14 15 INCLUDE(CheckCXXSourceCompiles) 16 17 MACRO (CHECK_PROTOTYPE_EXISTS _SYMBOL _HEADER _RESULT) 18 SET(_INCLUDE_FILES) 19 FOREACH (it ${_HEADER}) 20 SET(_INCLUDE_FILES "${_INCLUDE_FILES}#include <${it}>\n") 21 ENDFOREACH (it) 22 23 SET(_CHECK_PROTO_EXISTS_SOURCE_CODE " 24 ${_INCLUDE_FILES} 25 int main() 26 { 27 #ifndef ${_SYMBOL} 28 int i = sizeof(&${_SYMBOL}); 29 #endif 30 return 0; 31 } 32 ") 33 CHECK_CXX_SOURCE_COMPILES("${_CHECK_PROTO_EXISTS_SOURCE_CODE}" ${_RESULT}) 34 ENDMACRO (CHECK_PROTOTYPE_EXISTS _SYMBOL _HEADER _RESULT) 35 36
