[vtk-developers] [ANNOUNCE] New module system landing

[Ben Boeckel]

On Fri, Feb 01, 2019 at 12:26:18 -0700, David Gobbi wrote:
> On Fri, Feb 1, 2019 at 11:58 AM Ben Boeckel <ben.boeckel at kitware.com> wrote:
> > It was partially done to get
> > away from the default verbiage of `option` which uses `ON/OFF` since it
> > isn't really a CMake boolean.
> 
> That's like saying that if we use "0" and "1" as binary digits, we have
> to make up new names/symbols for 0 and 1 when using decimal...

Should they instead be called `MUST_BUILD` and `CANNOT_BUILD` to avoid
all ambiguity? One other difference is actually that the old `ON/OFF` is
actually `YES/DONT_WANT` in the new module system since telling the old
system `OFF` didn't prevent the building of the module whereas `NO`
errors out if it would otherwise be built. So it's might be closer to
"0" and "1" in binary meaning "0" and "3" in the decimal…

--Ben