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0f7fdd3475
A packed struct needs different gcc attributes for compilations with MinGW compilers because glib-2.0 adds compiler flag -mms-bitfields which modifies the packing algorithm. Attribute gcc_struct reverses the negative effects of -mms-bitfields. QEMU_PACKED sets this attribute and must be used for any packed struct which is affected by -mms-bitfields. Signed-off-by: Stefan Weil <weil@mail.berlios.de> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
41 lines
1.2 KiB
C
41 lines
1.2 KiB
C
/* public domain */
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#ifndef COMPILER_H
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#define COMPILER_H
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#include "config-host.h"
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#define QEMU_NORETURN __attribute__ ((__noreturn__))
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#ifdef CONFIG_GCC_ATTRIBUTE_WARN_UNUSED_RESULT
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#define QEMU_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
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#else
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#define QEMU_WARN_UNUSED_RESULT
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#endif
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#if defined(_WIN32)
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# define QEMU_PACKED __attribute__((gcc_struct, packed))
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#else
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# define QEMU_PACKED __attribute__((packed))
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#endif
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#define QEMU_BUILD_BUG_ON(x) \
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typedef char qemu_build_bug_on__##__LINE__[(x)?-1:1];
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#if defined __GNUC__
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# if (__GNUC__ < 4) || \
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defined(__GNUC_MINOR__) && (__GNUC__ == 4) && (__GNUC_MINOR__ < 4)
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/* gcc versions before 4.4.x don't support gnu_printf, so use printf. */
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# define GCC_ATTR __attribute__((__unused__, format(printf, 1, 2)))
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# define GCC_FMT_ATTR(n, m) __attribute__((format(printf, n, m)))
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# else
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/* Use gnu_printf when supported (qemu uses standard format strings). */
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# define GCC_ATTR __attribute__((__unused__, format(gnu_printf, 1, 2)))
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# define GCC_FMT_ATTR(n, m) __attribute__((format(gnu_printf, n, m)))
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# endif
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#else
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#define GCC_ATTR /**/
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#define GCC_FMT_ATTR(n, m)
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#endif
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#endif /* COMPILER_H */
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