Re: Compilation time (was Re: GCC 3.3)

[Gabriel Dos Reis <gdr at integrable-solutions dot net>]

Phil Edwards <phil@jaj.com> writes:

| On Wed, Apr 30, 2003 at 08:34:05PM +0200, Gabriel Dos Reis wrote:
| > Phil Edwards <phil@jaj.com> writes:
| > | 
| > | Anything in particular?
| > 
| > I would suggest qt-3.1.1 for C++ sources -- no fancy things though.
| 
| The following sentence that you snipped was
| 
|                               I don't much care what, but its build time
|     multiplied by 5 needs to not be hellishly long.
| 
| and in another message, you wrote
| 
|     compiling Qt without -ftime-report takes about an hour (and about
|     thrice that time with -ftime-report) on my pentium 4 (2GHz) box
|     running a GNU/Linux system.
| 
| Five hours falls into the hellishly long category.
| 
| But there may be hope:  how much time does "no fancy things" shave from
| that hour of build time?

The "fancy things" was referring to C++ features used in Qt.  The
sources all tend to be made on the same scheme: heavy class hierarchy,
small codes in .cc files, many things at global scope, basic template
usage (well this part may depend on whether you specify -stl or not). 

| If building the non-fancy parts of Qt only takes
| 10 minutes, then that's a very viable option.

Some take less that 10 min, some (very few) more than 10 min.
As I said, they tend to ressemble each other in the set of used
features. 

-- Gaby