[Bug 229246] -Wl,--unresolved-symbols=ignore-in-object-files fails

[bugzilla...@freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229246

Bug ID: 229246
Summary: -Wl,--unresolved-symbols=ignore-in-object-files fails
for shared libraries
Product: Base System
Version: 11.1-STABLE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: misc
Assignee: bu...@FreeBSD.org
Reporter: yu...@freebsd.org

This command line:
> c++ -Wl,--unresolved-symbols=ignore-in-object-files -shared -o libblank.so blank.cpp
fails:
> /usr/lib/libcxxrt.so: undefined reference to `_Unwind_GetDataRelBase@GCC_3.0'
> /usr/lib/libcxxrt.so: undefined reference to `_Unwind_SetIP@GCC_3.0'
> /usr/lib/libcxxrt.so: undefined reference to `_Unwind_GetIP@GCC_3.0'
> /lib/libc.so.7: undefined reference to `__progname'
> /usr/lib/libcxxrt.so: undefined reference to `_Unwind_RaiseException@GCC_3.0'
> /usr/lib/libcxxrt.so: undefined reference to `_Unwind_GetLanguageSpecificData@GCC_3.0'
> /usr/lib/libcxxrt.so: undefined reference to `_Unwind_GetRegionStart@GCC_3.0'
> /usr/lib/libcxxrt.so: undefined reference to `_Unwind_SetGR@GCC_3.0'
> /usr/lib/libc++.so.1: undefined reference to `_Unwind_Resume@GCC_3.0'
> /usr/lib/libcxxrt.so: undefined reference to `_Unwind_Backtrace@GCC_3.3'
> /usr/lib/libcxxrt.so: undefined reference to `_Unwind_Resume_or_Rethrow@GCC_3.3'
> /lib/libc.so.7: undefined reference to `environ'
> /usr/lib/libcxxrt.so: undefined reference to `_Unwind_GetTextRelBase@GCC_3.0'
> clang-6.0: error: linker command failed with exit code 1 (use -v to see invocation)

There are no object files that user supplied, so
-Wl,--unresolved-symbols=ignore-in-object-files should be practically a noop?

I found this error in one of the projects, and it seems like a bug in the
compiler to me. It should link whatever it links normally without this flag.

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