[qemu.git] / compiler.h

/* 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
#else
#define GCC_ATTR /**/
#define GCC_FMT_ATTR(n, m)
#endif

#endif /* COMPILER_H */
Commit	Line	Data
	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 cat(x,y) x ## y
	34	#define cat2(x,y) cat(x,y)
	35	#define QEMU_BUILD_BUG_ON(x) \
	36	typedef char cat2(qemu_build_bug_on__,__LINE__)[(x)?-1:1];
	37
	38	#if defined __GNUC__
	39	# if !QEMU_GNUC_PREREQ(4, 4)
	40	/* gcc versions before 4.4.x don't support gnu_printf, so use printf. */
	41	# define GCC_ATTR __attribute__((__unused__, format(printf, 1, 2)))
	42	# define GCC_FMT_ATTR(n, m) __attribute__((format(printf, n, m)))
	43	# else
	44	/* Use gnu_printf when supported (qemu uses standard format strings). */
	45	# define GCC_ATTR __attribute__((__unused__, format(gnu_printf, 1, 2)))
	46	# define GCC_FMT_ATTR(n, m) __attribute__((format(gnu_printf, n, m)))
	47	# endif
	48	#else
	49	#define GCC_ATTR /**/
	50	#define GCC_FMT_ATTR(n, m)
	51	#endif
	52
	53	#endif /* COMPILER_H */