[PATCH] linker_set.h: Add alignof implementation for when not C11 or C++11

[Gedare Bloom]

This seems alright to me. At least, it should get some complaints
quickly if it doesn't work :)

On Tue, Jul 20, 2021 at 3:04 PM Joel Sherrill <joel at rtems.org> wrote:
>
> The default implementation was completely broken. Use the GCC specific
> __alignof__ if compiling for C99 or C++03. If not C++11, C11, or
> GCC, then it is an error.
> ---
>  freebsd/sys/sys/linker_set.h | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/freebsd/sys/sys/linker_set.h b/freebsd/sys/sys/linker_set.h
> index baa5ae4..9af5307 100755
> --- a/freebsd/sys/sys/linker_set.h
> +++ b/freebsd/sys/sys/linker_set.h
> @@ -73,8 +73,10 @@
>    #define RTEMS_BSD_ALIGNOF( _type_name ) alignof( _type_name )
>  #elif __STDC_VERSION__ >= 201112L
>    #define RTEMS_BSD_ALIGNOF( _type_name ) _Alignof( _type_name )
> +#elif defined(__GNUC__)
> +  #define RTEMS_BSD_ALIGNOF( _type_name ) __alignof__( _type_name )
>  #else
> -  #define RTEMS_BSD_ALIGNOF( _type_name ) sizeof( _type_name )
> +  #error "FIX ME! Implement RTEMS_BSD_ALIGNOF() for this environment"
>  #endif
>
>  #define RTEMS_BSD_SET_ALIGN( type )    \
> --
> 1.8.3.1
>
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