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

From: Rolf Ebert
Subject: Re: [avr-libc-dev] Question on Optimizations with Linking
Date: Fri, 25 Nov 2005 08:28:05 +0100
User-agent: Opera M2/8.51 (Win32, build 7712)

I might be missing something here, but isn't this what -ffunction-sections and -fdata-sections compiler options combined with --gc-sections linker option are supposed to do? Are there any drawbacks of using this, like worse optimization, etc.? Or is this not working at all for avr?

It depends on whether this feature is implemented in the avr tools.
(Don't know if it is or not)

It is (t least partly). There was a bug in gcc in previous versions, which is fixed since gcc-3.4.3 at least (PR14064). You still need a patch for binutils, though (https://savannah.nongnu.org/patch/?func=detailitem&item_id=3593).

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.


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