Looks like https://bugs.debian.org/964477 is related or the same, not sure which way the merge should go. There's some existing discussion there, including suggesting that the commit I cited below was not the only thing that broke it, given it was marked "found" in 10.1.0-1.
It also looks like https://bugs.debian.org/972936 might be related, as well as the archived bug https://bugs.debian.org/946285 I've collected some mentions of this issue in the readme of <https://salsa.debian.org/rpavlik/gcc-10-compat> Thanks for your help! Ryan On 12/4/2020 12:27 PM, Ryan Pavlik wrote: > I have also experienced this bug, as have a lot of others on the > internet (try searching for "libc6-dev : Breaks: libgcc-8-dev (< > 8.4.0-2~) but 8.3.0-6 is to be installed" to see). The bug appears to be > in the new gcc-10 package, not the gcc-8 package it's replacing on upgrade. > > It looks like it's a result of the lack of transitional packages from > libgcc1 to libgcc-s1 (and its relatives). They were removed from sid and > bullseye for 10.1.0-2, in this commit: > https://salsa.debian.org/toolchain-team/gcc/-/commit/e8047f6d4947d94d7475987d0697434f1e6504d7 > > (though multi-arch properties were removed before then). > > I was able to work around this issue by creating a simple mostly-empty > source package that created the missing transitional packages and > installing them, though this is of course inferior to having them > actually provided by the relevant source package. > https://salsa.debian.org/rpavlik/gcc-10-compat (I only mocked up/built > the packages required to test on x86_64/i386, but I'd expect the same > problem and solution on the other platforms that have additional libgcc > packages.) > > I have a reproducible test case: I did it in a Dockerfile, but you could > do the equivalent commands in a chroot or which ever way you prefer. > Essentially, you can start with a fairly minimal Debian Buster install, > and install the following packages: > > apt-get install -y -qq --no-install-recommends gcc-8 libc6-dev libreoffice > > (This is one minimal set to reproduce - there may be others.) > > Then, when you switch the Buster sources to Bullseye, you'll get this > error on your attempt to apt-get dist-upgrade: > > > ~~~~~~~~~~~~ > > Calculating upgrade... Error! > Some packages could not be installed. This may mean that you have > requested an impossible situation or if you are using the unstable > distribution that some required packages have not yet been created > or been moved out of Incoming. > The following information may help to resolve the situation: > > The following packages have unmet dependencies: > libc6-dev : Breaks: libgcc-8-dev (< 8.4.0-2~) but 8.3.0-6 is to be > installed > E: Error, pkgProblemResolver::Resolve generated breaks, this may be > caused by held packages. > > ~~~~~~~~~~~~ > > You can confirm the fix by adding the repo with my workaround > transitional packages: > > deb > http://download.opensuse.org/repositories/home:/rpavlik:/bullseye-fix > Debian_Testing/ > > (key is at > http://download.opensuse.org/repositories/home:/rpavlik:/bullseye-fix/Debian_Testing/Release.key > ) > > I've uploaded my dockerfile for experimenting with this bug to > https://salsa.debian.org/rpavlik/gcc-upgrade-testcase > > It looks to me, based on the workaround I was able to create, that the > solution might include re-enabling the transitional packages for > bullseye/sid at least until the release of bullseye as stable. At that > point, anyone upgrading to testing or unstable would be coming from a > bullseye release that has the gcc-10 with new names, so the transitional > packages would not be needed anymore. > > >
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