arm-elf cross compiler on cygwin - again

[Richard Earnshaw]

> After a brief moment of happiness, the world  fell apart again :-))

:-(

> In function `operator new[](unsigned long)':
> ../../../../gcc-3.0/libstdc++-v3/libsupc++/new_opv.cc:35: undefined
> reference to `LLSDA1'

> Can someone explain what's going on here ??

Yep, the exception handling code in the C++ libraries is stuffed.  The 
full story is complex, but basically, the dwarf2 exception handling model 
was changed fairly late in the release process and the ARM back-end didn't 
catch up.  As a result, it fell back to using setjmp/longjmp unwinding, 
and the tables in this format trip a bug in the compiler when used with 
dwarf2 debug format (the default for the arm-elf back-end).

I filed a PR about this earlier this week, but I'm hoping that 3.0.1 will 
revert back to having proper dwarf2 based unwinders by default.

R.



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