lang/rust failing to build on aarch64

[Renato Botelho]

Here at pfSense we follow ports tree quarterly branch.  This week I 
merged 2020Q4 and then rust stop building on 12.x aarch64.

Before the merge we had rust version 1.44.1_1 and now we got 1.46.0.

We do native build on a ThunderX running 13-CURRENT from January 
(r357002) and poudriere jail is running stable/12 based src.  When I try 
to build I got the following error (full log at [1]):

rustc command: 
"LD_LIBRARY_PATH"="/wrkdirs/usr/ports/lang/rust/work/bootstrap/lib:/wrkdirs/usr/ports/lang/rust/work/rustc-1.46.0-src/build/aarch64-unknown-freebsd/stage0-std/release/deps:/wrkdirs/usr/ports/lang/rust/work/bootstrap/lib" 
"/wrkdirs/usr/ports/lang/rust/work/bootstrap/bin/rustc" "--crate-name" 
"rustc_std_workspace_core" "--edition=2018" 
"src/tools/rustc-std-workspace-core/lib.rs" "--error-format=json" 
"--json=diagnostic-rendered-ansi,artifacts" "--crate-type" "lib" 
"--emit=dep-info,metadata,link" "-C" "opt-level=3" "-Cembed-bitcode=no" 
"-C" "debuginfo=0" "-C" "metadata=6ef567c55f0253ba" "-C" 
"extra-filename=-6ef567c55f0253ba" "--out-dir" 
"/wrkdirs/usr/ports/lang/rust/work/rustc-1.46.0-src/build/aarch64-unknown-freebsd/stage0-std/aarch64-unknown-freebsd/release/deps" 
"--target" "aarch64-unknown-freebsd" "-C" "linker=cc" "-L" 
"dependency=/wrkdirs/usr/ports/lang/rust/work/rustc-1.46.0-src/build/aarch64-unknown-freebsd/stage0-std/aarch64-unknown-freebsd/release/deps" 
"-L" 
"dependency=/wrkdirs/usr/ports/lang/rust/work/rustc-1.46.0-src/build/aarch64-unknown-freebsd/stage0-std/release/deps" 
"--extern" 
"core=/wrkdirs/usr/ports/lang/rust/work/rustc-1.46.0-src/build/aarch64-unknown-freebsd/stage0-std/aarch64-unknown-freebsd/release/deps/libcore-65643217d9192060.rmeta" 
"--cfg=bootstrap" "-Zmacro-backtrace" 
"-Clink-args=-Wl,-rpath,$ORIGIN/../lib" "-Cprefer-dynamic" 
"-Zbinary-dep-depinfo" "-Wrust_2018_idioms" "-Wunused_lifetimes" 
"-Dwarnings" "--sysroot" 
"/wrkdirs/usr/ports/lang/rust/work/rustc-1.46.0-src/build/aarch64-unknown-freebsd/stage0-sysroot" 
"-Z" "force-unstable-if-unmarked"
sysroot: 
"/wrkdirs/usr/ports/lang/rust/work/rustc-1.46.0-src/build/aarch64-unknown-freebsd/stage0-sysroot"
libdir: "/wrkdirs/usr/ports/lang/rust/work/bootstrap/lib"
  command did not execute successfully: 
"/wrkdirs/usr/ports/lang/rust/work/bootstrap/bin/cargo" "build" 
"--target" "aarch64-unknown-freebsd" "-Zbinary-dep-depinfo" "-j" "12" 
"-v" "--release" "--frozen" "--features" "panic-unwind backtrace 
compiler-builtins-c" "--manifest-path" 
"/wrkdirs/usr/ports/lang/rust/work/rustc-1.46.0-src/src/libtest/Cargo.toml" 
"--message-format" "json-render-diagnostics"
expected success, got: signal: 11
Traceback (most recent call last):
   File "x.py", line 11, in <module>
     bootstrap.main()
   File 
"/wrkdirs/usr/ports/lang/rust/work/rustc-1.46.0-src/src/bootstrap/bootstrap.py", 
line 981, in main
     bootstrap(help_triggered)
   File 
"/wrkdirs/usr/ports/lang/rust/work/rustc-1.46.0-src/src/bootstrap/bootstrap.py", 
line 967, in bootstrap
     run(args, env=env, verbose=build.verbose)
   File 
"/wrkdirs/usr/ports/lang/rust/work/rustc-1.46.0-src/src/bootstrap/bootstrap.py", 
line 143, in run
     raise RuntimeError(err)
RuntimeError: failed to run: 
/wrkdirs/usr/ports/lang/rust/work/rustc-1.46.0-src/build/bootstrap/debug/bootstrap 
install --jobs=12
*** Error code 1

[1] https://gist.github.com/rbgarga/b2a31ffed23cd761f8dd30b8850eec68

--
Renato Botelho