[Mesa-dev] [PATCH] mesa: add STATIC_ASSERT() macro for compile-time assertions

[Jose Fonseca]

Brian,

The whole series looks a nice cleanup to me.

I haven't tried to compile this on MSVC, but it looks ordinary C, so it should be alright.

Jose

----- Original Message -----
> This can be used to check that tables have the right number of
> entries,
> etc. at compile-time.  This will hopefully catch things that are
> missed
> if particular drivers aren't tested, for example.
> 
> v2: Simplify the macro to omit the extra line number info (the
> compiler
> already indicates the line number).  And wrap the macro for
> readability.
> ---
>  src/mesa/main/compiler.h |   12 ++++++++++++
>  1 files changed, 12 insertions(+), 0 deletions(-)
> 
> diff --git a/src/mesa/main/compiler.h b/src/mesa/main/compiler.h
> index 921e302..25d9810 100644
> --- a/src/mesa/main/compiler.h
> +++ b/src/mesa/main/compiler.h
> @@ -310,6 +310,18 @@ static INLINE GLuint CPU_TO_LE32(GLuint x)
>  #endif
>  #endif
>  
> +
> +/**
> + * Static (compile-time) assertion.
> + * Basically, use COND to dimension an array.  If COND is false/zero
> the
> + * array size will be -1 and we'll get a compilation error.
> + */
> +#define STATIC_ASSERT(COND) \
> +   do { \
> +      typedef int static_assertion_failed[(!!(COND))*2-1]; \
> +   } while (0)
> +
> +
>  #if (__GNUC__ >= 3)
>  #define PRINTFLIKE(f, a) __attribute__ ((format(__printf__, f, a)))
>  #else
> --
> 1.7.3.4
> 
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