[Bug other/42333] complex division failure on darwin10 with -lm

["ghazi at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #17 from ghazi at gcc dot gnu dot org  2009-12-09 00:34 -------
(In reply to comment #15)
> (In reply to comment #13)
> > You can try filing a bug report at Apple, but I think a better route would be
> > to see if we can avoid linking in the system ___divdc3  from FSF GCC.
> > 
> This may be impossible without having FSF gcc access its own ___divdc3 under
> a different symbol name. The functionality of libgcc has been subsumed into
> libSystem in darwin10 and the symbols from libgcc itself are supposed to be 
> ignored in favor of those from libSystem...
> http://lists.cs.uiuc.edu/pipermail/llvmdev/2009-September/025898.html

I don't think we should get into a cat-and-mouse game of renaming functions
that *are already FSF functions* just to avoid Apple's rewritten versions. 
Who's to say they won't override the new name(s) in a future release with the
same broken copy(ies)?  The sad thing is they changed ___divdc3 and they don't
even emit it from their compiler. :-/

If you want to file a bug report at Apple using the FSF generated assembly (and
C testcase for reference), please proceed.  I hope they fix their ___divdc3
routine.  Note there may be other complex math things they've rewritten. 
Someone would need to audit Apple's compiler to see what else they've changed.

On what to do about builtin-math-7.c testcase, my inclination is we should just
XFAIL it for darwin10 since fixing darwin's ___divdc3 won't help with
distributions out in the field.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42333