[Bug 207732] libgcc_s .eh_frame handling messes up interpreting powerpc/powerpc64 frame pointer register use produced by clang 3.8.0

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Sun Mar 6 08:13:58 UTC 2016


Mark Millard <markmi at dsl-only.net> changed:

           What    |Removed                     |Added
         Resolution|---                         |Not A Bug
             Status|New                         |Closed

--- Comment #2 from Mark Millard <markmi at dsl-only.net> ---
With the other errors identified and reported for .eh_frame and C++ exception
handling for powerpc it is getting harder to tell if a problem is a new problem
or a consequence of the other ones. (Various problems have no work around yet
to avoid them.)

This turned out to be a consequence of the other problems.

It was easier to discover once I induced gcc 4.2.1 to generate some example
code with r31 in use as a frame pointer. (I used alloca.) Observing its
behavior and the .eh_frame output indicated I'd misinterpreted where the
earliest problem was.

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