Paul Smith <psmith@xxxxxxx> writes: > Just to note that this usage clearly contravenes the documentation, > which states that preprocessor statement lines cannot begin with a TAB. > It was a bug that this was allowed by the GNU Make parser. > > I understand that in many projects (Linux, probably Git :)) if the > documentation and behavior disagreed then the documentation would be > changed, not the behavior. If a bug is left in a released version long enough, it becomes a feature your users depend upon. We saw that happen to us, I am sure the mantra "don't break userspace" the kernel project had comes from the same place. I am not sure what benefits are gained by the existing users with this change to ease fixing some parser bug (I didn't bother to see your bug tracker) so I cannot judge if the benefit outweighs the cost of them all having to scramble and adjust to the new world order.