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dsputil: workaround __VA_ARGS__ missing tokenization for MSVC

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A second expansion forces the preprocessor to tokenize properly.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Luca Barbato 2012-07-25 16:22:34 +02:00 committed by Martin Storsjö
parent b797f3c4d0
commit 0db2d94280
1 changed files with 7 additions and 3 deletions
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10
libavcodec/dsputil.h
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@ -622,22 +622,26 @@ void ff_mlp_init_x86(DSPContext* c, AVCodecContext *avctx);
# define STRIDE_ALIGN 8
#endif
// Some broken preprocessors need a second expansion
// to be forced to tokenize __VA_ARGS__
#define E(x) x
#define LOCAL_ALIGNED_A(a, t, v, s, o, ...) \
uint8_t la_##v[sizeof(t s o) + (a)]; \
t (*v) o = (void *)FFALIGN((uintptr_t)la_##v, a)
#define LOCAL_ALIGNED_D(a, t, v, s, o, ...) DECLARE_ALIGNED(a, t, v) s o
#define LOCAL_ALIGNED(a, t, v, ...) LOCAL_ALIGNED_A(a, t, v, __VA_ARGS__,,)
#define LOCAL_ALIGNED(a, t, v, ...) E(LOCAL_ALIGNED_A(a, t, v, __VA_ARGS__,,))
#if HAVE_LOCAL_ALIGNED_8
# define LOCAL_ALIGNED_8(t, v, ...) LOCAL_ALIGNED_D(8, t, v, __VA_ARGS__,,)
# define LOCAL_ALIGNED_8(t, v, ...) E(LOCAL_ALIGNED_D(8, t, v, __VA_ARGS__,,))
#else
# define LOCAL_ALIGNED_8(t, v, ...) LOCAL_ALIGNED(8, t, v, __VA_ARGS__)
#endif
#if HAVE_LOCAL_ALIGNED_16
# define LOCAL_ALIGNED_16(t, v, ...) LOCAL_ALIGNED_D(16, t, v, __VA_ARGS__,,)
# define LOCAL_ALIGNED_16(t, v, ...) E(LOCAL_ALIGNED_D(16, t, v, __VA_ARGS__,,))
#else
# define LOCAL_ALIGNED_16(t, v, ...) LOCAL_ALIGNED(16, t, v, __VA_ARGS__)
#endif