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.

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

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.