Actually no, it's unset during `read_mozconfig()`, after [`subprocess.check_output()`](https://searchfox.org/mozilla-central/rev/0a2eba79c24300ce0539f91c1bebac2e75264e58/python/mozbuild/mozbuild/mozconfig.py#161) with command: `['C:/mozilla-build/msys2/usr/bin/sh.exe', 'c:/users/sasch/documents/github/gecko-dev/python/mozbuild/mozbuild/mozconfig_loader', 'C:/Users/sasch/Documents/GitHub/gecko-dev', 'C:/Users/sasch/Documents/GitHub/gecko-dev/mozconfig', 'C:\\Users\\sasch\\.mozbuild\\srcdirs\\gecko-dev-1a7eab949d3b\\_virtualenvs\\mach\\Scripts\\python.exe', 'c:/users/sasch/documents/github/gecko-dev/python/mozbuild/mozbuild/action/dump_env.py']` Meh, I just rediscovered comment #4 🙂
Bug 1744340 Comment 7 Edit History
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Actually no, it's unset during `read_mozconfig()`, after [`subprocess.check_output()`](https://searchfox.org/mozilla-central/rev/0a2eba79c24300ce0539f91c1bebac2e75264e58/python/mozbuild/mozbuild/mozconfig.py#161) with command: `['C:/mozilla-build/msys2/usr/bin/sh.exe', 'c:/users/sasch/documents/github/gecko-dev/python/mozbuild/mozbuild/mozconfig_loader', 'C:/Users/sasch/Documents/GitHub/gecko-dev', 'C:/Users/sasch/Documents/GitHub/gecko-dev/mozconfig', 'C:\\Users\\sasch\\.mozbuild\\srcdirs\\gecko-dev-1a7eab949d3b\\_virtualenvs\\mach\\Scripts\\python.exe', 'c:/users/sasch/documents/github/gecko-dev/python/mozbuild/mozbuild/action/dump_env.py']` Meh, I just rediscovered comment #4 🙂 Edit: `MSYS=enable_pcon` doesn't seem to help, even when updating MSYS to the current latest version (20220904).