How to debug a bootstrap error?

[fxcoudert]

I have reported a bootstrap error on macOS at #44435 (comment)
I'd like to provide more information, but I'm not myself a Julia user or developer, and I do not know how to get a meaningful backtrace.

The command-line is:

make VERBOSE=1 USE_BINARYBUILDER=0 prefix=/opt/homebrew/Cellar/julia/HEAD-487757b sysconfdir=/opt/homebrew/etc USE_SYSTEM_CSL=1 USE_SYSTEM_LLVM=1 USE_SYSTEM_LIBUNWIND=1 USE_SYSTEM_PCRE=1 USE_SYSTEM_OPENLIBM=1 USE_SYSTEM_BLAS=1 USE_SYSTEM_LAPACK=1 USE_SYSTEM_GMP=1 USE_SYSTEM_MPFR=1 USE_SYSTEM_LIBSUITESPARSE=1 USE_SYSTEM_UTF8PROC=1 USE_SYSTEM_MBEDTLS=1 USE_SYSTEM_LIBSSH2=1 USE_SYSTEM_NGHTTP2=1 USE_SYSTEM_CURL=1 USE_SYSTEM_LIBGIT2=1 USE_SYSTEM_PATCHELF=1 USE_SYSTEM_ZLIB=1 USE_SYSTEM_P7ZIP=1 LIBBLAS=-lopenblas LIBBLASNAME=libopenblas LIBLAPACK=-lopenblas LIBLAPACKNAME=libopenblas USE_BLAS64=0 PYTHON=python3 MACOSX_VERSION_MIN=12 install

and the error is:

 cd /private/tmp/julia-20220306-4216-xj58a5/base && /private/tmp/julia-20220306-4216-xj58a5/usr/bin/julia -C "apple-a12" --output-ji /private/tmp/julia-20220306-4216-xj58a5/usr/lib/julia/corecompiler.ji.tmp --startup-file=no --warn-overwrite=yes -g0 -O0 compiler/compiler.jl
error during bootstrap:
LoadError(at "compiler/compiler.jl" line 3: LoadError(at "compiler/bootstrap.jl" line 10: InexactError(func=:trunc, T=Int32, val=4294967295)))

I've seen that the doc recommends running julia inside a debugger, adding breakpoints at jl_error and jl_throw, which I did, but they didn't get triggered. I look at the compiler/bootstrap.jlline 10, but the line contains only let, so it is not very instructive.

Could someone provide instructions on how to debug such a bootstrap issue?