Re: [PATCH] kbuild: make Clang build userprogs for target architecture

[Miguel Ojeda]

Hi Masahiro,

On Sun, Jul 5, 2020 at 5:30 PM Masahiro Yamada <masahiroy@xxxxxxxxxx> wrote:
>
> Hmm, adding '#include <sys/types.h>' did not make any difference.

That should have worked, because POSIX defines it to be there. It
sounds like you need --sysroot to point it to the proper ones.

> If I add -std=c99, I get a different error.

Yeah, that is the expected behavior. C99 does not have the implicit
int rule anymore (unlike older C) so ssize_t (an unknown type given
that program) is not being interpreted as int anymore (which is what
triggers the warning later about the mismatch between size_t and int
in the format string).

> In contrast, 'size_t' has no problem.

That is expected too, because size_t is defined via stdio.h (size_t is
a C standard type, ssize_t is not -- it is a POSIX one).

Hope that helps,

Cheers,
Miguel