Follow up on why the release action failed on macOS (0.6.13)

[ggreif]

We had a hiccup with the macOS-sided release action on GitHub. It failed with

copying path '/nix/store/0x2lxbjgbfddmgq4wpwbxza90jdmvmhp-nixpkgs-mozilla-src' from 'https://ic-hs-test.cachix.org'...
/Users/runner/work/_temp/fd74e0ed-0437-4954-91c1-4a4641c4fb61.sh: line 2:  2796 Segmentation fault: 11  nix-build --max-jobs 1 --argstr releaseVersion 0.6.13 -A moc -A mo-ide -A mo-doc -A js.moc -A js.moc_interpreter
Error: Process completed with exit code 139.

See https://github.com/dfinity/motoko/runs/4264083664.

So a quick-fix was installed: #2911.

We have to find out where the problem lies and how to fix it for good.

We could also run the building part of the release action (without the upload) on each master branch build to get an early warning next time.

[ggreif]

#2913 was created to debug things a bit more. The build reliably fails on macOS with nix-2.4, GC_DONT_GC: 1 is needed. (It just has to be present, the value seems to not matter.)

[ggreif]

I have locally just upgraded to nix-2.4 on this Mac. I get:

[nix-shell:~/motoko]$ nix-build -A moc -A mo-ide -A mo-doc -A js.moc -A js.moc_interpreter
Segmentation fault: 11

So we have a repro. Prefixing the command with env GC_DONT_GC=1 makes the problem go away.

It also goes away if I reduce the 5 attributes to any 4 :-)

Running nix-instantiate -A moc -A mo-ide -A mo-doc -A js.moc -A js.moc_interpreter also works.

[ggreif]

$ nix --version
nix (Nix) 2.4

[ggreif]

$ nix --version
nix (Nix) 2.8.1

The repro recipe seems to work okay.

GC_DONT_GC is eliminated.

Closing.