Re: Fedora 33 System-Wide Change proposal: CompilerPolicy Change

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On Fri, Jun 05, 2020 at 08:27:13AM -0400, Neal Gompa wrote:
> On Fri, Jun 5, 2020 at 8:26 AM Neal Gompa <ngompa13@xxxxxxxxx> wrote:
> >
> > On Fri, Jun 5, 2020 at 6:47 AM Vitaly Zaitsev via devel
> > <devel@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
> > >
> > > On 05.06.2020 09:52, Kevin Kofler wrote:
> > > > I am opposed to this change. Chromium and Firefox build fine with GCC. I
> > > > think that a distribution should be built with a consistent toolchain
> > > > wherever possible.
> > >
> > > Clang is much better than GCC nowadays. It has better architecture,
> > > support lots of optimizations and analyzers.
> > >
> > > GCC is a legacy compiler. It should be completely replaced by Clang in
> > > the nearest future.
> > >
> >
> > Having worked in a distribution that uses Clang by default
> > (OpenMandriva), I can say that this is *not true*. Switching from GCC
> > to Clang cost OpenMandriva a lot of performance. It also cost them a lot of
> > security hardening at the compiler level. GCC-built binaries are still
> > better, and remain better as long as people are continually using and
> > developing for it.
> >
> > This change appears to largely be driven by the maintainers of web
> > browser packages that upstream have no GCC validation and it has to be
> > done in Fedora downstream. I know Chromium is a lost cause (Google
> > couldn't possibly care any less than they do now, especially since
> > they don't even care about Python 2 being EOL), but has anyone talked
> > to Mozilla about introducing GCC-based CI for Firefox code? I assume
> > they have a CI infrastructure that's relatively pluggable.
> >
> > Note that having stuff mix compilers is also a bad idea because LTO is
> > compatible across the two compilers. If you want to use LTO, you need
> > to use the same compiler across the chain, or stuff will break.
> >
> 
> Yay thinkos... I mean that LTO is *not* compatible across the two compilers.

Does this change conflict with:

https://fedoraproject.org/wiki/LTOByDefault

?

Rich.

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