[gentoo-dev] gcc-11 enters ~arch tree

[gentoo-dev] gcc-11 enters ~arch tree

[Sergei Trofimovich]

Today gcc-11.1.0 released upstream and was added to ::gentoo as:
    https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=cc068d96fb49e308456cbe944fb29b1f78e6ad5c

User-visible changes are nicely described in upstream porting doc:
    https://gcc.gnu.org/gcc-11/porting_to.html

A few highlights I personally encountered are:
- use -std=gnu++17 instead of -std=gnu++14
- ordered pointer comparison with integer (like int *p; 'p > 0')
- dynamic exception specifications
- gcc now enforces that comparison objects be invocable as const
- header dependency changes

On top of that:
- -fipa-modref (enabled by default) might expose latent bugs in existing
  programs. -fno-ipa-modref should be a quick hack to check the hypothesis.

Failures don't look widespread, thus gcc-11 should be fine to use as a
default compiler.

Check out known bugs and workarounds on gcc-11 tracker:
    https://bugs.gentoo.org/show_bug.cgi?id=gcc-11

Gentoo Toolchain wiki page for common fixes (nothing there so far):
    https://wiki.gentoo.org/wiki/Project:Toolchain#gcc-11

As usual if you can't figure out what is wrong with your package
pull in toolchain@ to the bug and we'll get to the bottom of it.

Good luck!

-- 

  Sergei

Re: [gentoo-dev] gcc-11 enters ~arch tree

[Sam James]

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> On 27 Apr 2021, at 19:22, Sergei Trofimovich <slyfox@gentoo.org> wrote:
> 
> Today gcc-11.1.0 released upstream and was added to ::gentoo as:
>    https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=cc068d96fb49e308456cbe944fb29b1f78e6ad5c
> 

And same day too!


> [snip]
> As usual if you can't figure out what is wrong with your package
> pull in toolchain@ to the bug and we'll get to the bottom of it.

Just wanted to say thanks for always being there to sort out
things like this, cheers for that.

Let’s hope we have a smoother time than 10, but I think some of us
are more braced for it either way...

> 
> Good luck!
> 
> --
> 
>  Sergei
> 

Best,
sam

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