On Tue, Dec 07, 2010 at 05:30:46PM +0100, Michael Büsch wrote:
> The "frame larger than 2560" error is thrown for certain files.
> What was the reasoning behind the number 2560? Is that just a strange
> random number, or does something bad happen, if the frame overruns
> that limit?
The number was somewhat arbitrary. I tried to describe my rationale gin
the commit that inteoduced it:
commit ce8de3d45ed9e5c4299012b1b609c839157ac57c
Author: Jeff Epler <jep...@unpythonic.net>
Date: Thu Nov 4 01:46:08 2010 +0000
build: tame the stack size warnings
gcc 4.4 introduced -Wframe-larger-than=N to produce warnings when the
stack frame of a function is larger than a certain size. The linux
kernel, which uses 4kB or 8kB stacks, sets this warning threshold at
1024 bytes.
We hit this warning in a number of places, but because hal uses a stack
size of 16kB, the default warning threshold is too conservative a choice
for us. Setting the limit to 2560 bytes silences all the warnings
currently in the software, including the largest stack frame of 2256
bytes in genserikins.c:kinematicsInverse(). We have reports from
alex_joni that genserkins works in the field, so there's every reason to
think that the new warning limit of 2560 bytes is reasonable.
Jeff
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