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

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Message-ID: <CAK7LNATRAuEXp+Wz7f_VUTSFS4jqmdTE4Xugi1MZozimsj6zuA@mail.gmail.com>
Date:   Mon, 6 Jul 2020 00:29:16 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
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

On Wed, Jul 1, 2020 at 4:13 AM Miguel Ojeda
<miguel.ojeda.sandonis@...il.com> wrote:
>
> On Tue, Jun 30, 2020 at 6:26 PM Masahiro Yamada <masahiroy@...nel.org> wrote:
> >
> > I can reproduce this in the following
> > simple test code:
> >
> >
> > ----------------->8----------------
> > #include <stdio.h>
> >
> > int main(void)
> > {
> >         ssize_t x = 1;
> >
> >         printf("%zd", x);
> >
> >         return 0;
> > }
> > --------------->8-------------------
>
> That is the old implicit int rule. Try including sys/types.h or
> compiling with a standard like -std=c99 for instance.
>
> Cheers,
> Miguel

Hmm, adding '#include <sys/types.h>' did not make any difference.




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


$ clang -std=c99 --target=aarch64-linux-gnu test.c
test.c:5:10: error: unknown type name 'ssize_t'; did you mean 'size_t'?
         ssize_t x = 1;
         ^~~~~~~
         size_t
/home/masahiro/tools/clang-latest/lib/clang/11.0.0/include/stddef.h:46:23:
note: 'size_t' declared here
typedef __SIZE_TYPE__ size_t;
                      ^
1 error generated.





In contrast, 'size_t' has no problem.


----------------->8----------------
#include <stdio.h>

int main(void)
{
         size_t x = 1;

         printf("%zu", x);

         return 0;
}
--------------->8-------------------

$ clang  --target=aarch64-linux-gnu test.c
[ No warning ]




--
Best Regards
Masahiro Yamada