lang/rust 1.76 build failure

[Marc Baudoin <babafou%babafou.eu.org@localhost>]

Hi,

After yesterday's update, lang/rust 1.76 doesn't build on some of
my systems (previous versions did).  It builds OK on my larger
system (16 GiB RAM) but fails on my smaller systems (4 GiB RAM,
8 GiB swap).  I don't have any message related to memory
exhaustion in dmesg and it seems I didn't run out of swap (I
monitored the build with top, it didn't use much more than 1 GiB
of swap) so I doubt the issue is related to low memory on those
systems but that's the only difference I can think of.  The sure
thing is rustc got a SIGSEGV (build traces are at the end of this
message).

Any idea?

Building stage1 library artifacts (x86_64-unknown-netbsd)
[...]
  rustc exited with signal: 11 (SIGSEGV)
[...]
expected success, got: exit status: 101
Traceback (most recent call last):
  File "/srv/tmp/work/lang/rust/work/rustc-1.76.0-src/./x.py", line 50, in <module>
    bootstrap.main()
  File "/srv/tmp/work/lang/rust/work/rustc-1.76.0-src/src/bootstrap/bootstrap.py", line 1136, in main
    bootstrap(args)
  File "/srv/tmp/work/lang/rust/work/rustc-1.76.0-src/src/bootstrap/bootstrap.py", line 1112, in bootstrap
    run(args, env=env, verbose=build.verbose, is_bootstrap=True)
  File "/srv/tmp/work/lang/rust/work/rustc-1.76.0-src/src/bootstrap/bootstrap.py", line 187, in run
    raise RuntimeError(err)
RuntimeError: failed to run: /srv/tmp/work/lang/rust/work/rustc-1.76.0-src/build/bootstrap/debug/bootstrap -v build --stage 2 -j 4
*** Error code 1

Stop.