[Bug sanitizer/81066] sanitizer_stoptheworld_linux_libcdep.cc:276:22: error: aggregate ‘sigaltstack handler_stack’ has incomplete type and cannot be defined

[fw at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81066

--- Comment #6 from Florian Weimer <fw at gcc dot gnu.org> ---
(In reply to Khem Raj from comment #5)
> +#ifndef __stack_t_defined
> +struct stack_t;
> +#endif

Where does __stack_t_defined come from?  If this is the definition from the
glibc headers, that's really brittle because it's totally internal.