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Re: C++ binary compatibility
On Thursday 19 June 2008, Mark Davies wrote:
> On Thursday 19 June 2008 19:24:13 James Chacon wrote:
> > Was there ever a decision here? Leaving the current libstdc++ at major
> > 6 when that isn't binary compatible with older copies from 4.0 seems
> > really wrong.
> Its PR 38804 and its on the "high priority" list to be looked at before 5.0
> but I'm not aware of anyone actively looking at it. (I'm happy to help
> where I can but don't don't have any ideas where to start).
> > Any reason not to just bump it's version?
> Presumably people would like to understand what changed before making that
I made an attempt to debug the issue before finally recompiling the kde
It looks like an instance of std::basic_istream gets clobbered. I tried to
watch the address location but without hardware watchpoint support in gdb it
takes too long (code executes at least 100,000 slower when using
watchpoints). My suspicion is that the kde libraries has the sizeof some
structure compiled-in and that the new libstdc somehow has a different size
for that structure.
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