Re: question about linker

On 07/12/2024 23:12, Scott Lurndal wrote:

David Brown <david.brown@hesbynett.no> writes:

On 07/12/2024 17:57, Bart wrote:

On 07/12/2024 16:17, David Brown wrote:

On 06/12/2024 23:26, Scott Lurndal wrote:

David Brown <david.brown@hesbynett.no> writes:

 

This is to be lauded. Somebody actually questioning something whether
build-times should be that long.
>
Somebody other than me, that is.
>

>
There's a big difference, however.  I am asking Scott with a view to
helping him get more efficient use out of the good tools he uses.
(Scott's been doing this stuff pretty much since the dawn of time, but
there's still a possibility that there are things he has not thought about.)

 The problem is not the tools.  We know exactly what causes the
slowdown (and it is related to code autogenerated from yaml
data structure descriptions).   The algorithms used to initialize
internal data structures seriously stress the GCC optimizer.   To
the point that there is a 20:1 difference in compile time
for a handful of source files (up to 8 minutes in one case)
between -O0 and -O3.
 Time permitting, the plan is to replace the initial ad-hoc
design with something both scalable and performant.

Ah, okay, that makes sense.
I think perhaps you wrote something along the lines of "compiling one file takes x seconds", which I interpreted as referring to any one file, while you meant one file in particular.
I guess you just try to minimise how often those few nasty files need to be compiled.