linux-kernel - Re: [PATCH] compiler.h: avoid escaped section names

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Date:   Tue, 29 Sep 2020 23:33:10 +0200
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        linux-sparse@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH] compiler.h: avoid escaped section names

Hi Nick,

On Tue, Sep 29, 2020 at 9:43 PM Nick Desaulniers
<ndesaulniers@...gle.com> wrote:
>
> The stringification operator, `#`, in the preprocessor escapes strings.
> For example, `# "foo"` becomes `"\"foo\""`.  GCC and Clang differ in how
> they treat section names that contain \".
>
> The portable solution is to not use a string literal with the
> preprocessor stringification operator.
>
> In this case, since __section unconditionally uses the stringification
> operator, we actually want the more verbose
> __attribute__((__section__())).

Let's add a comment about this in the code -- otherwise we/someone
will convert it back without noticing. Also we could add another on
`__section` itself warning about this.

> Link: https://bugs.llvm.org/show_bug.cgi?id=42950

Is there a link / have we opened a bug on GCC's side too?

Thanks!

Cheers,
Miguel