| # - 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 |
| |
| 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} |
| 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) |
| |