[PyKDE] Problem building PyQt, QScintilla, and eric

[Greg Fortune]

On Wednesday 12 March 2003 11:31 am, Jim Bublitz wrote:
> On 12-Mar-03 Gerard Vermeulen wrote:
> > On Wed, Mar 12, 2003 at 10:27:51AM -0800, Greg Fortune wrote:
> >> > Or use the -c flag, then you only need to get a coffee.
> >>
> >> he he, I'm on a PIII 550 so compiling anything takes a little
> >> while :)
> >>
> >> What does it do?  If there is no disadvantage to using -c, could
> >> you include that flag by default?
> >
> > It concatenates all sip generated C++ files into a single file.
> > So in the end all header files get parsed once, instead of many
> > times.
> >
> > Some compilers (gcc-2.96) are memory hungry and will start
> > swapping if you use the -c switch (this is also more likely to
> > happen if you have compile Qt with -O3 or more). If the compiler
> > starts swapping to disk you can stay in bed the next day :-)
>
> The qt module needs about 100MB of RAM with the -c switch, so on a
> low memory machine (around 128MB or less) it would be best to not
> use -c, or at least use it without running X. Otherwise, swapping
> depends on what you have loaded.
>
> On the plus side, it cuts compile times for PyQt and PyKDE by about
> 80% (on the same machine).
>
> On a 600MHz Celeron/64MB RAM/no -c I've had PyKDE take as long as
> 3-1/2 hours to compile. On an Athlon1900/1GB DDR/-c it takes under
> 6 minutes. I would think your 550MHz would do PyQt under 15 minutes
> if you have enough RAM and use -c.


Wow!  That's huge! I'll try that next time I have to compile.  Thanks to 
everyone for the tip...

Greg