[PATCH 5/6] Make error_t an enumeration on all supported OSes.

[Florian Weimer]

On 06/10/2017 07:17 PM, Zack Weinberg wrote:
> +printf '#include <features.h>\n#include <bits/errno.h>\n' |
> +    $CC -E -dM -xc -D_GNU_SOURCE -D_ERRNO_H "$@" - > "$tmp1"

I'm worried this fails to produce a header which is multi-arch-clean
(i.e., on x86-64, produce something which is compatible with x86-64,
i386, and x32).  Maybe the situation is better than with the system call
list; at least a cursory glimpse at the kernel sources suggests that
these headers don't have multi-arch preprocessor conditionals there.

It would be safer to have a built-in list of possible errno constant
names and generate a header from that, similar to what I did for the
system call names (but for which we failed to reach consensus).

Thanks,
Florian