qemu/compiler.h
Anthony Liguori 76b64a7aa8 win32: provide separate macros for weak decls and definitions
mingw32 seems to want the declaration to also carry the weak attribute.
Strangely, gcc on Linux absolutely does not want the declaration to be marked
as weak.  This may not be the right fix, but it seems to do the trick.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2012-08-15 13:26:03 -05:00

61 lines
1.8 KiB
C

/* public domain */
#ifndef COMPILER_H
#define COMPILER_H
#include "config-host.h"
/*----------------------------------------------------------------------------
| The macro QEMU_GNUC_PREREQ tests for minimum version of the GNU C compiler.
| The code is a copy of SOFTFLOAT_GNUC_PREREQ, see softfloat-macros.h.
*----------------------------------------------------------------------------*/
#if defined(__GNUC__) && defined(__GNUC_MINOR__)
# define QEMU_GNUC_PREREQ(maj, min) \
((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
#else
# define QEMU_GNUC_PREREQ(maj, min) 0
#endif
#define QEMU_NORETURN __attribute__ ((__noreturn__))
#if QEMU_GNUC_PREREQ(3, 4)
#define QEMU_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
#else
#define QEMU_WARN_UNUSED_RESULT
#endif
#if defined(_WIN32)
# define QEMU_PACKED __attribute__((gcc_struct, packed))
#else
# define QEMU_PACKED __attribute__((packed))
#endif
#define cat(x,y) x ## y
#define cat2(x,y) cat(x,y)
#define QEMU_BUILD_BUG_ON(x) \
typedef char cat2(qemu_build_bug_on__,__LINE__)[(x)?-1:1];
#if defined __GNUC__
# if !QEMU_GNUC_PREREQ(4, 4)
/* gcc versions before 4.4.x don't support gnu_printf, so use printf. */
# define GCC_ATTR __attribute__((__unused__, format(printf, 1, 2)))
# define GCC_FMT_ATTR(n, m) __attribute__((format(printf, n, m)))
# else
/* Use gnu_printf when supported (qemu uses standard format strings). */
# define GCC_ATTR __attribute__((__unused__, format(gnu_printf, 1, 2)))
# define GCC_FMT_ATTR(n, m) __attribute__((format(gnu_printf, n, m)))
# endif
#if defined(_WIN32)
#define GCC_WEAK __attribute__((weak))
#define GCC_WEAK_DECL GCC_WEAK
#else
#define GCC_WEAK __attribute__((weak))
#define GCC_WEAK_DECL
#endif
#else
#define GCC_ATTR /**/
#define GCC_FMT_ATTR(n, m)
#endif
#endif /* COMPILER_H */