bfgminer/ccan/compiler/_info

/*
 * Copyright 2011 Rusty Russell
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 3 of the License, or (at your option) any
 * later version.  See LICENSE for more details.
 */

#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;
}