thodg/cgminer/ccan/compiler/_info

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• Author : Rusty Russell
  Date : 2011-07-06 16:47:25
  Hash : a0d14d15
  Message : ccan: add ccan/opt and dependencies to build.

• ccan/compiler/_info

• #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;
  }