207732 submitted: libgcc_s .eh_frame handling messes up interpreting powerpc/powerpc64 frame pointer register use produced by clang 3.8.0

[Mark Millard]

I have submitted FreeBSD bug 207732:

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

In essence clang++ 3.8.0 generates Frame Pointer Register based code (r31 in addition to the r1 stack pointer) that g++ 4.2.1/4.9/5.3 (normally) do not and so the clang++ 3.8.0 code ends up touching an error in libgcc_s interpreting .eh_frame information for C++ exception handling that gcc 4.2.1 and the like side step by not using such a Frame Pointer register.

Note: The context for libgcc_s was a clang 3.8.0 based buildworld. A gcc buildworld does not involve such a Frame Pointer Register.

I do not know if any TARGET_ARCH's other than powerpc/powerpc64 also generate such Frame Pointer Register like code and so might touch the same error.


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Mark Millard
markmi at dsl-only.net