#include <string.h> #include <stdio.h> #include "config.h" /** * compiler - macros for common compiler extensions * * Abstracts away some compiler hints. Currently these include: * - COLD * For functions not called in fast paths (aka. cold functions) * - PRINTF_FMT * For functions which take printf-style parameters. * - IDEMPOTENT * For functions which return the same value for same parameters. * - NEEDED * For functions and variables which must be emitted even if unused. * - UNNEEDED * For functions and variables which need not be emitted if unused. * - UNUSED * For parameters which are not used. * - IS_COMPILE_CONSTANT * For using different tradeoffs for compiletime vs runtime evaluation. * * License: LGPL (3 or any later version) * Author: Rusty Russell <rusty@rustcorp.com.au> * * Example: * #include <ccan/compiler/compiler.h> * #include <stdio.h> * #include <stdarg.h> * * // Example of a (slow-path) logging function. * static int log_threshold = 2; * static void COLD PRINTF_FMT(2,3) * logger(int level, const char *fmt, ...) * { * va_list ap; * va_start(ap, fmt); * if (level >= log_threshold) * vfprintf(stderr, fmt, ap); * va_end(ap); * } * * int main(int argc, char *argv[]) * { * if (argc != 1) { * logger(3, "Don't want %i arguments!\n", argc-1); * return 1; * } * return 0; * } */ int main(int argc, char *argv[]) { /* Expect exactly one argument */ if (argc != 2) return 1; if (strcmp(argv[1], "depends") == 0) { return 0; } return 1; }