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Re: [avr-libc-dev] Question on Optimizations with Linking
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From: |
Björn Haase |
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Subject: |
Re: [avr-libc-dev] Question on Optimizations with Linking |
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Date: |
Sat, 26 Nov 2005 10:28:35 +0100 |
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User-agent: |
KMail/1.7.1 |
>
> Björn has prepared extended linker optimizations
> (http://lists.gnu.org/archive/html/avr-libc-dev/2005-10/msg00042.html)
> that also cover the --gc-sections bit. That work is currently integrated
> in the binutils development.
The most recent discussions are available on the binutils mailing list. It's
not yet in the source tree since I don't currently find time to work on it
due to my job, but I consider the last version I have posted to be
sufficiently stable for beta testing. We are already using it for production
use.
The most important optimization IMO is linker relaxation. I.e. the combination
of --gc-sections and -Wl,--relax -Wl,--gc-sections . After my experience on
our production applications you could estimate to gain between 500 bytes and
1k for a 16k device. It depends on how many tiny functions your application
is using.
Bjoern.