--On Wednesday, June 04, 2003 4:35 PM -0700 "Ralf W. Grosse-Kunstleve" 
<rwgk@[...].com>  wrote:

>  --- gideon may <gideon@[...].org> wrote:
> > Regarding compilation on Linux in debug mode (gcc 3.2),
> > I have extremely long linking phases, sometimes up to an hour
> > with my application :(. Is there a way to speed this up ?
> > Linking without debug info is much faster.
> 
>  I am always using -O0. If and only if I really need the debug symbols I
>  recompile with -g (with SCons and bjam you can do this without
>  interferring with your -O0 built).

I agree with you, normally I do build release versions (am using bjam),
but in the case that I do need debugging info I normally take lunch :)

> 
> > > 2. Once you have your (run)time-consuming core algorithms implemented
> > > in C++ and wrapped with Boost.Python you can spend most of your time
> > > working with the much more pleasant Python language. I am sometimes
> > > going for weeks without recompiling.
> >
> > Except if you're actively developing the wrapper library and looking
> > for bugs in your code.
> 
>  True, but:
> 
>  - Parallel builts really help.

Agree, if you have a multiprocessor system. And parallel builds don't speed
up the linking phase, which is definitely the bottleneck in the 
edit-compile-test
loop.

>  - Good build systems like SCons and bjam always only recompile what is
>  really needed (i.e. no "make clean" necessary ever).

what is make clean or  bjam clean <wink>  ?

>  - You can maximize the benefits of parallel builts and good build systems
>  by modularizing your code, which is also good for other reasons.

Again, the compilation is fast in comparison with the linking. Unfortunately
I do need to link after I change a single source file. BTW, my library 
consists
of about 100 source files, thus I could say the code is pretty modular.

>  - While developing you can use the fastest platform available. Test on
>  slower platforms later.

With me they are all one and the same  platform :(

Guess I will do some profiling of the gcc linker and file a report, as Dave 
mentioned

ciao
gideon


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