failing to compile rustc on current pkgsrc on current

[Riccardo Mottola <riccardo.mottola%libero.it@localhost>]

Hi!
running NetBSD 10.99.10 on amd64, i am upgrading pkgsrc. It is to the 
point to upgrade rustc and fails.



     Running 
`/usr/pkgsrc/lang/rust/work/rustc-1.76.0-src/build/bootstrap/debug/rustc 
/usr/pkgsrc/lang/rust/work/rustc-1.76.0-src/build/bootstrap/debug/rustc 
--crate-name build_script_build --edition=2021 
/usr/pkgsrc/lang/rust/work/rustc-1.76.0-src/vendor/proc-macro2/build.rs 
--error-format=json 
--json=diagnostic-rendered-ansi,artifacts,future-incompat 
--diagnostic-width=176 --crate-type bin --emit=dep-info,link -C 
embed-bitcode=no -C debug-assertions=off --cfg 'feature="default"' --cfg 
'feature="proc-macro"' -Zunstable-options --check-cfg 'cfg(feature, 
values("default", "nightly", "proc-macro", "span-locations"))' -C 
metadata=841051aa1bfbe1c9 -C extra-filename=-841051aa1bfbe1c9 --out-dir 
/usr/pkgsrc/lang/rust/work/rustc-1.76.0-src/build/x86_64-unknown-netbsd/stage2-tools/release/build/proc-macro2-841051aa1bfbe1c9 
-L 
dependency=/usr/pkgsrc/lang/rust/work/rustc-1.76.0-src/build/x86_64-unknown-netbsd/stage2-tools/release/deps 
--cap-lints allow -Z binary-dep-depinfo`

Did not run successfully: signal: 11 (SIGSEGV)
LD_LIBRARY_PATH="/usr/pkgsrc/lang/rust/work/rustc-1.76.0-src/build/x86_64-unknown-netbsd/stage2/lib:/usr/pkgsrc/lang/rust/work/rustc-1.76.0-src/build/x86_64-unknown-netbsd/stage2-tools/release/deps:/usr/pkgsrc/lang/rust/work/rustc-1.76.0-src/build/x86_64-unknown-netbsd/stage2/lib:/usr/pkgsrc/lang/rust/work/rust-bootstrap/lib" 
"/usr/pkgsrc/lang/rust/work/rustc-1.76.0-src/build/x86_64-unknown-netbsd/stage2/bin/rustc" 
"--crate-name" "build_script_build" "--edition=2021" 
"/usr/pkgsrc/lang/rust/work/rustc-1.76.0-src/vendor/proc-macro2/build.rs" 
"--error-format=json" 
"--json=diagnostic-rendered-ansi,artifacts,future-incompat" 
"--diagnostic-width=176" "--crate-type" "bin" "--emit=dep-info,link" 
"-C" "embed-bitcode=no" "-C" "debug-assertions=off" "--cfg" 
"feature=\"default\"" "--cfg" "feature=\"proc-macro\"" 
"-Zunstable-options" "--check-cfg" "cfg(feature, values(\"default\", 
\"nightly\", \"proc-macro\", \"span-locations\"))" "-C" 
"metadata=841051aa1bfbe1c9" "-C" "extra-filename=-841051aa1bfbe1c9" 
"--out-dir" 
"/usr/pkgsrc/lang/rust/work/rustc-1.76.0-src/build/x86_64-unknown-netbsd/stage2-tools/release/build/proc-macro2-841051aa1bfbe1c9" 
"-L" 
"dependency=/usr/pkgsrc/lang/rust/work/rustc-1.76.0-src/build/x86_64-unknown-netbsd/stage2-tools/release/deps" 
"--cap-lints" "allow" "-Z" "binary-dep-depinfo" "-Zunstable-options" 
"--check-cfg=cfg(bootstrap)"
-------------
rustc exited with signal: 11 (SIGSEGV)
error: could not compile `proc-macro2` (build script)

The failure is repeatable

any ideas?

Riccardo