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# - Check if the given struct or class has the specified member variable
# CHECK_STRUCT_HAS_MEMBER (STRUCT MEMBER HEADER VARIABLE)
#
# STRUCT - the name of the struct or class you are interested in
# MEMBER - the member which existence you want to check
# 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
#
# Example: CHECK_STRUCT_HAS_MEMBER("struct timeval" tv_sec sys/select.h HAVE_TIMEVAL_TV_SEC)
INCLUDE(CheckCSourceCompiles)
MACRO (CHECK_STRUCT_HAS_MEMBER _STRUCT _MEMBER _HEADER _RESULT)
SET(_INCLUDE_FILES)
FOREACH (it ${_HEADER})
SET(_INCLUDE_FILES "${_INCLUDE_FILES}#include <${it}>\n")
ENDFOREACH (it)
SET(_CHECK_STRUCT_MEMBER_SOURCE_CODE "
${_INCLUDE_FILES}
int main()
{
${_STRUCT}* tmp;
tmp->${_MEMBER};
return 0;
}
")
CHECK_C_SOURCE_COMPILES("${_CHECK_STRUCT_MEMBER_SOURCE_CODE}" ${_RESULT})
ENDMACRO (CHECK_STRUCT_HAS_MEMBER)
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