LXR qemu/compiler.h

   1/* public domain */
   2
   3#ifndef COMPILER_H
   4#define COMPILER_H
   5
   6#include "config-host.h"
   7
   8/*----------------------------------------------------------------------------
   9| The macro QEMU_GNUC_PREREQ tests for minimum version of the GNU C compiler.
  10| The code is a copy of SOFTFLOAT_GNUC_PREREQ, see softfloat-macros.h.
  11*----------------------------------------------------------------------------*/
  12#if defined(__GNUC__) && defined(__GNUC_MINOR__)
  13# define QEMU_GNUC_PREREQ(maj, min) \
  14         ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
  15#else
  16# define QEMU_GNUC_PREREQ(maj, min) 0
  17#endif
  18
  19#define QEMU_NORETURN __attribute__ ((__noreturn__))
  20
  21#if QEMU_GNUC_PREREQ(3, 4)
  22#define QEMU_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
  23#else
  24#define QEMU_WARN_UNUSED_RESULT
  25#endif
  26
  27#if defined(_WIN32)
  28# define QEMU_PACKED __attribute__((gcc_struct, packed))
  29#else
  30# define QEMU_PACKED __attribute__((packed))
  31#endif
  32
  33#define QEMU_BUILD_BUG_ON(x) \
  34    typedef char qemu_build_bug_on__##__LINE__[(x)?-1:1];
  35
  36#if defined __GNUC__
  37# if !QEMU_GNUC_PREREQ(4, 4)
  38   /* gcc versions before 4.4.x don't support gnu_printf, so use printf. */
  39#  define GCC_ATTR __attribute__((__unused__, format(printf, 1, 2)))
  40#  define GCC_FMT_ATTR(n, m) __attribute__((format(printf, n, m)))
  41# else
  42   /* Use gnu_printf when supported (qemu uses standard format strings). */
  43#  define GCC_ATTR __attribute__((__unused__, format(gnu_printf, 1, 2)))
  44#  define GCC_FMT_ATTR(n, m) __attribute__((format(gnu_printf, n, m)))
  45# endif
  46#else
  47#define GCC_ATTR /**/
  48#define GCC_FMT_ATTR(n, m)
  49#endif
  50
  51#endif /* COMPILER_H */
  52