include/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 QEMU_GNUC_PREREQ(4, 0)
  28 #define QEMU_SENTINEL __attribute__((sentinel))
  29 #else
  30 #define QEMU_SENTINEL
  31 #endif
  32
  33 #if QEMU_GNUC_PREREQ(4, 3)
  34 #define QEMU_ARTIFICIAL __attribute__((always_inline, artificial))
  35 #else
  36 #define QEMU_ARTIFICIAL
  37 #endif
  38
  39 #if defined(_WIN32)
  40 # define QEMU_PACKED __attribute__((gcc_struct, packed))
  41 #else
  42 # define QEMU_PACKED __attribute__((packed))
  43 #endif
  44
  45 #define cat(x,y) x ## y
  46 #define cat2(x,y) cat(x,y)
  47 #define QEMU_BUILD_BUG_ON(x) \
  48     typedef char cat2(qemu_build_bug_on__,__LINE__)[(x)?-1:1] __attribute__((unused));
  49
  50 #if defined __GNUC__
  51 # if !QEMU_GNUC_PREREQ(4, 4)
  52    /* gcc versions before 4.4.x don't support gnu_printf, so use printf. */
  53 #  define GCC_FMT_ATTR(n, m) __attribute__((format(printf, n, m)))
  54 # else
  55    /* Use gnu_printf when supported (qemu uses standard format strings). */
  56 #  define GCC_FMT_ATTR(n, m) __attribute__((format(gnu_printf, n, m)))
  57 #  if defined(_WIN32)
  58     /* Map __printf__ to __gnu_printf__ because we want standard format strings
  59      * even when MinGW or GLib include files use __printf__. */
  60 #   define __printf__ __gnu_printf__
  61 #  endif
  62 # endif
  63 #else
  64 #define GCC_FMT_ATTR(n, m)
  65 #endif
  66
  67 #endif /* COMPILER_H */