Macros
#define	__linktime_error(message) __attribute__((__error__(message)))

#define	BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))

#define	BUILD_BUG()

#define	BUG(s) do {} while(1)

Macro Definition Documentation

#define __linktime_error ( message ) __attribute__((__error__(message)))

#define BUG ( s ) do {} while(1)

#define BUILD_BUG ( )

Value:

do {                                                    \
                __build_bug_failed();                      \
        } while (0)

BUILD_BUG - break compile if used.

If you have some code that you expect the compiler to eliminate at build time, you should use BUILD_BUG to detect if it is unexpectedly used.

#define BUILD_BUG_ON ( condition ) ((void)sizeof(char[1 - 2*!!(condition)]))

Macros