This configuration option has a single valid use case: getting better branch coverage output. Nobody should ever ever use it in production. We should make it warn loudly.
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The check on configure.ac:55 seems to warn pretty loudly already as it prints an error message and aborts the configuration phase.
FWIW the Autoconf manual advises that [t]he error-description should start with a lower-case letter, and “cannot” is preferred to “can't”. So the current error message could be improved (on both points).