XPost: linux.debian.bugs.dist

On 15.03.25 10:55, Aurelien Jarno wrote:

On 2025-03-15 07:01, Helmut Grohne wrote:

Control: reassign -1 libc6-dev-i386
Control: affects -1 = src:gcc-14-cross
Control: tags -1 + ftbfs

On Sat, Mar 15, 2025 at 05:45:15AM +0100, Matthias Klose wrote:

sudo apt build-dep gcc-14-cross

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:

Unsatisfied dependencies:
builddeps:gcc-14-cross : Depends: libc6-dev-amd64-cross (>= 2.37) but it is
not installable
libc6-dev-i386-amd64-cross : Depends: libc6-dev-amd64-cross (=
2.40-4cross1) but it is not installable
libc6-dev-x32-amd64-cross : Depends: libc6-dev-amd64-cross (= 2.40-4cross1)
but it is not installable
Error: Unable to correct problems, you have held broken packages.

Matthias and me discussed the matter on irc. The bug introducing the
problem was #1092278 asking for libc6-dev-* to conflict with one
another. Now the transformed libc6-dev-*-*-cross packages move e.g.
/usr/lib32 to /usr/<triplet>/lib32 thereby resolving the underyling
conflict in the transformed packages. Moreover, since the conflicts lack
architecture qualifiers we get funky ones such as
libc6-dev-amd64-amd64-cross that don't exist anywhere. Qualifying them
is not a solution, because gcc-14-cross really wants both
libc6-dev-x32-i386-cross and libc6-dev-x32-amd64-cross at the same time
and while their package contents are coinstallable, the underlying glibc
packages libc6-dev-x32:i386 and libc6-dev-x32:amd64 really are not
coinstallable. It is the sysroot transformation that renders them
coinstallable.

Our discussion arrived at three ways to move forward from here and we
did not reach any agreement here.

1. glibc should conditionally emit these Conflicts. When a particular
environment variable is set by c-t-b, their emission is suppressed.

2. Someone (me?) develops a c-t-b patch that discards the conflicts in
the repacking step as that also is the step that fixes
coinstallability.

3. We revert those conflicts in trixie and retry with more time in
forky.

Matthias prefers 1. I object to 1 on reproducibility grounds and
favour 3 given the state of discussion.

cross-toolchain-base has been an increasing burden in packaging glibc, imposing too many development constraints and limiting changes that can
be made. Therefore my plan is to stop shipping the debian/ directory in
the glibc-source package starting with forky. cross-toolchain-base we'll
have to build the glibc from sources in its own way.

The toolchain being already frozen (since today), any change needs a pre-approval, so I would rather go with option 1 to make the approval
easier.

so instead of fixing the issue, threatening to remove the cross
compilers from the distro. Great! Users are our priority!

This is now the another time that patches from Helmut for
out-of-the-archive cross builds are breaking the in-archive cross compilers.

Matthias

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