[avr-libc-dev] Question on Optimizations with Linking

[Colin O'Flynn]

Hello,

This came out of the discussion with avr-libc about itoa:

Would it be a reasonable idea to change the optimization strategy for linking 
around a bit? Right now for example we already have a few options for printf, 
and now are looking at different options for itoa.

Although i think the poll concluded with just using a different name, I like 
the idea of having the same name but different link options.

What I was proposing was a more intelligent linking operation, basically 
moving those options out of the Makefile. Then you have a separate file that 
lists options you want. This has the advantage of supporting a whole slew of 
options for fine-tuning functions: for example if you need floating point but 
low accuracy, there could be a small but inaccurate library and a high-end 
library. It would take advantage of the fact that for open-source you 
normally have a lot of different implementations with trade-offs that 
different people value.

As well if you have a separate script or program to deal with the link 
options, you could end up with a lot smarter link options. For example look 
for using the floating point with printf when you don't have printf, look for 
calling math functions without math library, and so on. Then warn the user or 
link in the proper library based on their settings.

It could be a terrible idea - I'm not familiar enough with the linking 
strategy. However if it seems reasonable I could try to make a beta 
version...

Regards,

 -Colin