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

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Message-ID: <CANiq72=LOgebNs7kwLGrkgsM2pr=dQG4F1VWskdndAh39jHWcw@mail.gmail.com>
Date:   Mon, 6 Jul 2020 06:48:58 +0200
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Sam Ravnborg <sam@...nborg.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH] kbuild: make Clang build userprogs for target architecture

Hi Masahiro,

On Sun, Jul 5, 2020 at 5:30 PM Masahiro Yamada <masahiroy@...nel.org> 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