Re: [Xen-devel] [PATCH XTF 1/4] build: Support BUILD_BUG_ON() with compilers lacking _Static_assert()

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 28.09.17 at 12:59, <andrew.cooper3@xxxxxxxxxx> wrote:
> --- /dev/null
> +++ b/include/xtf/compiler-gcc.h
> @@ -0,0 +1,31 @@
> +#ifndef XTF_COMPILER_GCC_H
> +#define XTF_COMPILER_GCC_H
> +
> +#define GCC_VER (__GNUC__ * 10000 +          \
> +              __GNUC_MINOR__ * 100 +         \
> +              __GNUC_PATCHLEVEL__)
> +
> +/*
> + * The Clang __has_*() infrastructure is a very clean way to identify
> + * compiler support, without resorting to version checks.  Fake up
> + * enough support for XTF code to use, even on non-clang compilers.
> + */
> +
> +#ifndef __has_extension
> +
> +#define GCC_HAS_c_static_assert (GCC_VER >= 40600) /* _Static_assert() */
> +
> +#define __has_extension(x) GCC_HAS_ ## x

As always I'd recommend against underscore prefixed names.

Jan


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