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Re: Question on gdb and ?? And also Frame did not save PC message
Brian Keener wrote:
> As to the second part of my question - is there a way to determine what
> sources/debug info I still need to get around the ?? Or is that just a
> matter of tracing from the sources I can see to find what it is bing
> called next?
Most of those frames with ?? are totally bogus -- there is not actually
a frame at 0x00000028 or 0x00000001 etc., it's just that gdb got
confused trying to unwind the stack and did its best. One problem is
that Cygwin uses these sigfe/sigfe wrappers around most syscalls,
another is that gdb doesn't have debug info for system DLLs and if they
use FPO there's no way to unwind through them.
> Also when using the new gdb is the message about
> "Frame did not save PC message" expected or is that an indication of some
> limit exceeded or something else.
It's just another an indication that gdb is having trouble unwinding, as
with system DLLs with FPO enabled.
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