json-glib @1.2.8: llvm-objdump: Unknown command line argument '-macho'

[MStraeten (Martin Straeten)]

--->  Building json-glib
Error: Failed to build json-glib: command execution failed
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_json-glib/json-glib/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets to report a bug.
Error: Processing of port json-glib failed

failed while rebuilding after purging my old macports installation, my build from 15.11.2020 was successful (big sur, sdk 11.1 + Xcode 12.??)

[ryandesign (Ryan Carsten Schmidt)]

The error in the log is:

llvm-objdump: Unknown command line argument '-macho'.  Try: '/opt/local/libexec/llvm-11/bin/llvm-objdump --help'
llvm-objdump: Did you mean '-h'?
llvm-objdump: Unknown command line argument '-dylibs-used'.  Try: '/opt/local/libexec/llvm-11/bin/llvm-objdump --help'
llvm-objdump: Did you mean '--dylibs-used'?
llvm-objdump: Unknown command line argument '-non-verbose'.  Try: '/opt/local/libexec/llvm-11/bin/llvm-objdump --help'
llvm-objdump: Did you mean '--non-verbose'?
Traceback (most recent call last):
  File "/opt/local/bin/g-ir-scanner", line 99, in <module>
    sys.exit(scanner_main(sys.argv))
  File "/opt/local/lib/gobject-introspection/giscanner/scannermain.py", line 579, in scanner_main
    shlibs = create_binary(transformer, options, args)
  File "/opt/local/lib/gobject-introspection/giscanner/scannermain.py", line 419, in create_binary
    shlibs = resolve_shlibs(options, binary, options.libraries)
  File "/opt/local/lib/gobject-introspection/giscanner/shlibs.py", line 183, in resolve_shlibs
    _resolve_non_libtool(options, binary, non_libtool))
  File "/opt/local/lib/gobject-introspection/giscanner/shlibs.py", line 103, in _resolve_non_libtool
    output = subprocess.check_output(args)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/subprocess.py", line 411, in check_output
    return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/subprocess.py", line 512, in run
    raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['/bin/sh', '../libtool', '--mode=execute', 'otool', '-L', '/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_json-glib/json-glib/work/json-glib-1.2.8/json-glib/tmp-introspectnoqc3uiz/Json-1.0']' returned non-zero exit status 1.