Re: Gnulib's alloca.h used even when there is a system header

[Paul Eggert]

Eli Zaretskii wrote:
>   #ifndef alloca
>   # ifdef __GNUC__
> -#  define alloca __builtin_alloca
> +#  if HAVE_ALLOCA_H
> +#   include_next <alloca.h>
> +#  else
> +#   define alloca __builtin_alloca
> +#  endif
>   # elif defined _AIX

Why do the 'include_next' only for GCC? Why not do it for all compilers?

Also, what platforms don't work with the current Gnulib alloca module, and why?