Re: Two strange messages while building Emacs on MS-Windows

[Eli Zaretskii]

> Date: Mon, 10 Dec 2012 00:31:10 +0100
> From: Dani Moncayo <address@hidden>
> Cc: Stefan Monnier <address@hidden>, address@hidden
> 
> >  Another potential difference between what I do and what Dani
> > does is that Dani uses MSYS Bash, while I use cmd.exe.  But I can
> > hardly believe that MSYS Bash slows down things so much.
> 
> I've just bootstrapped (trunk revno 111165) using cmd.exe as shell,
> and it took 30 min. and 29sec.  I.e., the shell doesn't seem to be
> relevant here.
> 
> > Yet another possible reason could be that Dani runs a 64-bit Windows 7
> > while I did the above measurements on a 32-bit XPSP3.  Recently I
> > found out that running 32-bit executables on 64-bit Windows OS incurs
> > a tangible penalty.  But my own measurements of byte compilation on
> > Windows 7 show only 2-fold slowdown, which still brings us only to
> > around 20 min or so, not 30.  A mystery.
> 
> Yes, my current OS is Windows 7 64-bit.
> 
> Next time I'll try your changes to `lisp/makefile.w32-in', and see if
> they are effective here.

The mystery still stands.

I suggest to separate variables here, and time the byte compilation
alone.  Try this:

  cd lisp
  find . -name "*.elc" -delete
  make compile

and time the last command.

With the current trunk, you can do "make -j6 compile" instead of the
last command, and it should be about 3 to 4 times faster.