meson: scary KeyboardInterrupt backtrace displayed

[Philippe Mathieu-Daudé]

Pressing ^C while building (calling 'make') sometime displays KeyboardInterrupt exception backtrace (host Fedora 32):

$ make qemu-system-arm
Generating qemu-version.h with a meson_exe.py custom command
^CTraceback (most recent call last):
  File "/usr/bin/meson", line 6, in <module>
    from pkg_resources import load_entry_point
  File "/usr/lib/python3.8/site-packages/pkg_resources/__init__.py", line 3252, in <module>
    def _initialize_master_working_set():
  File "/usr/lib/python3.8/site-packages/pkg_resources/__init__.py", line 3235, in _call_aside
    f(*args, **kwargs)
  File "/usr/lib/python3.8/site-packages/pkg_resources/__init__.py", line 3277, in _initialize_master_working_set
    tuple(
  File "/usr/lib/python3.8/site-packages/pkg_resources/__init__.py", line 3278, in <genexpr>
    dist.activate(replace=False)
  File "/usr/lib/python3.8/site-packages/pkg_resources/__init__.py", line 2782, in activate
    fixup_namespace_packages(self.location)
  File "/usr/lib/python3.8/site-packages/pkg_resources/__init__.py", line 2295, in fixup_namespace_packages
    subpath = _handle_ns(package, path_item)
  File "/usr/lib/python3.8/site-packages/pkg_resources/__init__.py", line 2194, in _handle_ns
    importer = get_importer(path_item)
  File "/usr/lib64/python3.8/pkgutil.py", line 415, in get_importer
    importer = sys.path_importer_cache[path_item]
KeyboardInterrupt

$ make
[...]
Compiling C object libcommon.fa.p/disas_alpha.c.o
Compiling C object libcommon.fa.p/hw_isa_smc37c669-superio.c.o
Compiling C object libcommon.fa.p/hw_isa_isa-superio.c.o
Compiling C object libcommon.fa.p/hw_char_serial-isa.c.o
Compiling C object libcommon.fa.p/hw_acpi_aml-build-stub.c.o
^CTraceback (most recent call last):
  File "/usr/bin/meson", line 6, in <module>
    from pkg_resources import load_entry_point
  File "/usr/lib/python3.8/site-packages/pkg_resources/__init__.py", line 3252, in <module>
make: *** [Makefile.ninja:994: libcommon.fa.p/disas_alpha.c.o] Interrupt
make: *** [Makefile.ninja:998: libcommon.fa.p/hw_isa_smc37c669-superio.c.o] Interrupt
make: *** [Makefile.ninja:1025: libcommon.fa.p/hw_isa_isa-superio.c.o] Interrupt
make: *** [Makefile.ninja:1069: libcommon.fa.p/hw_char_serial-isa.c.o] Interrupt
make: *** [Makefile.ninja:1102: libcommon.fa.p/hw_acpi_aml-build-stub.c.o] Interrupt
make: *** [Makefile.ninja:2138: qemu-system-alpha.p/softmmu_main.c.o] Interrupt
make: *** [Makefile.ninja:949: libblock.fa.p/block_qcow2.c.o] Interrupt
    def _initialize_master_working_set():
  File "/usr/lib/python3.8/site-packages/pkg_resources/__init__.py", line 3235, in _call_aside
    f(*args, **kwargs)
  File "/usr/lib/python3.8/site-packages/pkg_resources/__init__.py", line 3287, in _initialize_master_working_set
    list(map(working_set.add_entry, sys.path))
  File "/usr/lib/python3.8/site-packages/pkg_resources/__init__.py", line 623, in add_entry
    for dist in find_distributions(entry, True):
  File "/usr/lib/python3.8/site-packages/pkg_resources/__init__.py", line 2065, in find_on_path
    for dist in factory(fullpath):
  File "/usr/lib/python3.8/site-packages/pkg_resources/__init__.py", line 2134, in distributions_from_metadata
    yield Distribution.from_location(
  File "/usr/lib/python3.8/site-packages/pkg_resources/__init__.py", line 2590, in from_location
    return cls(
  File "/usr/lib/python3.8/site-packages/pkg_resources/__init__.py", line 2571, in __init__
    self._version = safe_version(version)
  File "/usr/lib/python3.8/site-packages/pkg_resources/__init__.py", line 1331, in safe_version
    return str(packaging.version.Version(version))
  File "/usr/lib/python3.8/site-packages/pkg_resources/_vendor/packaging/version.py", line 205, in __init__
    self._version = _Version(
  File "<string>", line 1, in __new__
KeyboardInterrupt
make: *** [Makefile.ninja:875: qemu.syms.stamp] Interrupt

[Paolo Bonzini (bonzini)]

That's just how Python works. :-(

https://bugs.python.org/issue14229