make: opt-debug-file.mk:44: This goes to stderr only, once.
make: opt-debug-file.mk:47: This goes to stderr only, once.
make: opt-debug-file.mk:50: This goes to stderr, and in addition to the debug log.
CondParser_Eval: ${:!cat opt-debug-file.debuglog!:Maddition:[#]} != 1
Comparing 1.000000 != 1.000000
make: Unterminated quoted string [make 'This goes to stdout only, once.]
make: Unterminated quoted string [make 'This goes to stderr only, once.]
make: Unterminated quoted string [make 'This goes to stderr, and in addition to the debug log.]
CondParser_Eval: ${:!cat opt-debug-file.debuglog!:MUnterminated:[#]} != 1
Comparing 1.000000 != 1.000000
Cannot open debug file "/nonexistent-6f21c672-a22d-4ef7/opt-debug-file.debuglog"
exit status 2