bsdjhb added a comment. To be clear, are you getting the failure running libunwind's test suite or your own test? I've managed to get libunwind to cross-compile for me using GCC 6.3.0 on FreeBSD for O32, N32, and N64, but only to build the library, not the tests. I've been running a simple C++ test program (which is using a patched libunwind along with libc++ as it's C++ runtime) for testing. The program uses _Unwind_Backtrace() as well as throws a couple of C++ exceptions with catch handlers that print out the values thrown. If you are able to cross-build the libunwind tests and then run them under qemu I'd appreciate a pointer to get that working as I'd be happier running libunwind's tests than my own.
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