Options to generate uncallable C++ functions. #2995

Job	Run time
docs	22s
minimal	16s
msrv	1m 18s
rustfmt-clippy	17s
quickchecking	14s
test-expectations (ubuntu-latest)	56s
test (ubuntu-latest, 9.0, 0, 0, 0, 0)	1m 47s
test-expectations (macos-latest)	52s
test (ubuntu-latest, 9.0, 0, 0, 1, 0)	2m 3s
check-cfg	23s
test (ubuntu-latest, 9.0, 0, 1, 0, 0)	1m 34s
test-book	7s
test (ubuntu-latest, 9.0, 0, 1, 1, 0)	1m 45s
test-no-headers	30s
test (ubuntu-latest, 9.0, 1, 0, 0, 0)	2m 6s
test (ubuntu-latest, 9.0, 1, 0, 1, 0)	2m 5s
test (ubuntu-latest, 9.0, 1, 1, 0, 0)	2m 35s
test (ubuntu-latest, 9.0, 1, 1, 1, 0)	2m 9s
test (ubuntu-latest, 16.0, 0, 0, 0, 0)	4m 3s
test (ubuntu-latest, 16.0, 0, 0, 1, 0)	4m 27s
test (ubuntu-latest, 16.0, 0, 1, 0, 0)	4m 2s
test (ubuntu-latest, 16.0, 0, 1, 1, 0)	4m 19s
test (ubuntu-latest, 16.0, 1, 0, 0, 0)	5m 1s
test (ubuntu-latest, 16.0, 1, 0, 1, 0)	4m 50s
test (ubuntu-latest, 16.0, 1, 1, 0, 0)	5m 23s
test (ubuntu-latest, 16.0, 1, 1, 1, 0)	6m 35s
test (ubuntu-latest, 16.0, 0, 0, 1)	2m 32s
test (macos-latest, 16.0, 0, 0, 0)	2m 29s
success	1s
	1h 5m 1s

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