[Bug c++/35836] Wrong instruction generated for comparison with zero on PPC 64 bit

[oder at eleks dot lviv dot ua]

------- Comment #2 from oder at eleks dot lviv dot ua  2008-04-06 13:21 -------
(In reply to comment #1)
> You need to report this with apple or at least try a still maintained gcc
> version and provide a testcase without Mac specific headers.

Well, it's not so easy. ./configure for GCC 4.3.0 fails with "Building GCC
requires GMP 4.1+ and MPFR 2.3.0+". I don't know what these are and I'm not too
eager spending time to search for all the necessary stuff needed to build a new
version and find out that there is some problem with building I can't resolve
after all. If there are no prebuilt binaries publicly available that means
there must be some reason for it. 
I have already tried to build latest GCC once for QNX. Well, after few days and
lots of corrections to headers I succeeded. But then I found that there are
some system related settings I don't know how to specify for new compiler and
startup stubs in objs, I don't have sources for. So, even though compiler
worked I did not take a risk to use it for production binaries compilation.
As for getting rid of system-specific headers, I tried replacing
OSAtomicIncrement32Barrier(paoDestination) with increment for volatile int64_t,
but the problem can't be reproduced that way. 
This seems to be PowerPC architecture related problem and I don't have other
operating systems/machines based on PowerPC.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35836