linux-kernel - Re: Commit 258801563b breaks on old compilers

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Message-ID: <CALCETrWdnJJh_jkCKDOhFOj-MB_FmyEjf-oNdHQ91qd5fcHxHA@mail.gmail.com>
Date:	Fri, 31 Oct 2014 11:19:20 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: Commit 258801563b breaks on old compilers

On Oct 31, 2014 10:58 AM, "Boris Ostrovsky" <boris.ostrovsky@...cle.com> wrote:
>
> Andy,
>
>
> Your commit 258801563b ("x86/vdso: Change the PER_CPU segment to use struct desc_struct") in -tip breaks old compilers that don't support initialization of anonymous structures (I think pre-4.6):

I bet it breaks clang, too.  Tip people, can you add:

http://ozlabs.org/~akpm/mmots/broken-out/arch-x86-vdso-vmac-fix-build-with-older-gcc.patch

Thanks!

>
> FC-64 <build@...ld-mk2:~/xtt-x86_64/bootstrap> cat anon.c
> struct bar {
> struct {
> int i;
> };
> };
>
> main()
> {
> struct bar a = {.i = 0};
> }
>
> FC-64 <build@...ld-mk2:~/xtt-x86_64/bootstrap> gcc --version|head -1
> gcc (GCC) 4.4.4 20100503 (Red Hat 4.4.4-2)
> FC-64 <build@...ld-mk2:~/xtt-x86_64/bootstrap> gcc anon.c
> anon.c: In function ‘main’:
> anon.c:9: error: unknown field ‘i’ specified in initializer
> FC-64 <build@...ld-mk2:~/xtt-x86_64/bootstrap>
>
>
> but
>
> build@...ld-mk2 bootstrap]$ gcc --version|head -1
> gcc (GCC) 4.6.3 20120306 (Red Hat 4.6.3-2)
> [build@...ld-mk2 bootstrap]$ gcc anon.c
> [build@...ld-mk2 bootstrap]$
>
>
> -boris
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