Gentoo Archives: gentoo-dev

From: Sergei Trofimovich <slyfox@g.o>
To: gentoo-dev@l.g.o
Subject: [gentoo-dev] gcc-10 is in ~arch
Date: Fri, 08 May 2020 20:32:54
Message-Id: 20200508213236.6600101c@sf
gcc-10 was released yesterday and was pushed to ::gentoo's ~arch as:

Most of packages should Just Work. But we expect some amount of
build- and runtime breakage. Non-exhaustive list of things to watch for:

- missing includes in users' code
  Example build failure would be:
  "error: 'size_t' was not declared in this scope; did you mean 'std::size_t'?"
  where missing <stdint.h> for used size_t types.

- extra '-fcommon->-fno-common' linker failures for packages that
  ignore users' CFLAGS and thus missed Toralf's tinderbox runs.

- "9" -> "10" version change also managed to break many assumptions
  of how gcc versions are parsed by shell scripts and ebuilds.

  This causes all sorts of bizarre bugs:

- overhauled gcc-10 inliner heuristics will cause some amount of
  build/runtime breakage in existing fragile code.

  As an extreme example your stack-protected kernel might not boot:

Tracker of common breakages:

Landing page to steal-fixes-from/add-fixes-to:

If you can't figure out non-trivial breakage feel free to
add toolchain@ to the bug and we'll try to sort it out together.