GNU m4

Known bugs in GNU m4 1.4n

Known bugs in GNU m4

• undivert(0) might read from standard output.
• failure if sigaltstack or sigstack returns ENOSYS.

See also the TODO file.

undivert(0) might read from standard output

If calling undivert(0) when diverting to a non-zero diversion will cause m4 to read from standard output in an attempt to bring back diversion 0, which is not possible.

Fixed in version 1.4n

failure if sigaltstack or sigstack returns ENOSYS

If stack overflow detection is configured but the system doesn't support sigaltstack(2) or sigstack(2), m4 fails when the system call returns ENOSYS. It should silently revert to default behaviour.

A volunteer is badly needed for this, as I have no way of testing this myself.