Re: [COMMITTED][patch][version 9]add -ftrivial-auto-var-init and variable attribute "uninitialized" to gcc

[Richard Biener <richard.guenther@gmail.com>]

On Fri, Sep 10, 2021 at 3:47 PM Jose E. Marchesi via Gcc-patches
<gcc-patches@gcc.gnu.org> wrote:
>
>
> Hi Richard.
>
> > On Thu, 9 Sep 2021, Kees Cook wrote:
> >
> >> On Thu, Sep 09, 2021 at 10:49:11PM +0000, Qing Zhao wrote:
> >> > Hi, FYI
> >> >
> >> > I just committed the following patch to gcc upstream:
> >> >
> >> >
> >> > https://gcc.gnu.org/pipermail/gcc-cvs/2021-September/353195.html
> >>
> >> Hurray! Thank you so much for working on this, and thanks also to the
> >> reviewers and everyone else poking at it.
> >>
> >> I will go update my Linux Plumbers slides to say "supported" instead of
> >> "proposed". :)
> >
> > Can you two work on wording to add to gcc-12/changes.html for this
> > feature?  I think it deserves a release note.  Likewise the CTF/BTF
> > support btw.
>
> What about something like this for the BPF, CTF and BTF changes..

Looks good to me!

Thanks,
Richard.

> commit 3826495d1a2c265954d5da13ca71925eea390060 (HEAD -> master)
> Author: Jose E. Marchesi <jose.marchesi@oracle.com>
> Date:   Fri Sep 10 15:44:30 2021 +0200
>
>     gcc-12/changes.html: BPF, CTF and BTF update
>
>             * htdocs/gcc-12/changes.html (BPF): Item about the CO-RE support.
>             (Debugging formats): New section with items about the support for
>             CTF and BTF.
>
> diff --git a/htdocs/gcc-12/changes.html b/htdocs/gcc-12/changes.html
> index 946faa49..936af979 100644
> --- a/htdocs/gcc-12/changes.html
> +++ b/htdocs/gcc-12/changes.html
> @@ -143,6 +143,15 @@ a work-in-progress.</p>
>
>  <!-- <h3 id="avr">AVR</h3> -->
>
> +<h3 id="bpf">BPF</h3>
> +<ul>
> +  <li>Support for CO-RE (compile-once, run-everywhere) has been added
> +      to the BPF backend.  CO-RE allows to compile portable BPF
> +      programs that are able to run among different versions of the
> +      Linux kernel.
> +  </li>
> +</ul>
> +
>  <!-- <h3 id="x86">IA-32/x86-64</h3> -->
>
>  <!-- <h3 id="mips">MIPS</h3> -->
> @@ -210,7 +219,25 @@ a work-in-progress.</p>
>  <!-- <h2 id="plugins">Improvements for plugin authors</h2> -->
>
>  <!-- .................................................................. -->
> -<!-- <h2>Other significant improvements</h2> -->
> +<h2>Other significant improvements</h2>
> +
> +<h3 id="debug">Debugging formats</h3>
> +
> +<ul>
> +  <li>GCC can now generate debugging information
> +      in <a href="https://ctfstd.org">CTF</a>, a lightweight debugging
> +      format that provides information about C types and the
> +      association between functions and data symbols and types.  This
> +      format is designed to be embedded in ELF files and to be very
> +      compact and simple.  A new command-line
> +      option <code>-gctf</code> enables the generation of CTF.
> +  </li>
> +  <li>GCC can now generate debugging information in BTF.  This is a
> +      debugging format mainly used in BPF programs and the Linux
> +      kernel.  The compiler can generate BTF for any target, when
> +      enabled with the command-line option <code>-gbtf</code>
> +  </li>
> +</ul>
>
>
>  <!-- .................................................................. -->