On 03/04/10 22:43, Jonathan Nieder wrote:
Source: dnprogs
Version: 2.50.1
Hi Christine,
As you probably know, GCC 4.4 is more aggressive by default than
previous versions about taking advantage of C99 aliasing rules to speed
up code [1]. Building dnprogs produces warnings related to this
regarding dnet_pton1 (dnet_pton.c line 60) and dnet_ntop1 (dnet_ntop.c
line 49).
Problems from unexpected optimization can be hard to debug, so I thought
I should check in with you about these.
A quick fix is to disable the optimization with -fno-strict-aliasing.
Of course, it is much better to fix the strict aliasing violation
itself, by copying char by char (e.g., with memcpy), using a union to
make the aliasing explicit, or paraphrasing the code to avoid
type-punning altogether.
I noticed this while trying to build your package under hercules (s390
emulator). It’s still chugging away.
Please let me know if there is any more information I can provide to
help track this down.
Hiya,
Thanks for the report. I think I'll replace those lines with a memcpy
for safety. It's what I've done in a few other places - mainly where it
broke on SPARC ;-)
I have some other patches for DECnet queued up so I'll include this in
that update, hopefully in the coming week.
Chrissie
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