https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99172

--- Comment #2 from gcc-user at riseup dot net ---
> Note swapping out parts of the build system isn't tested/supported. 

This is both a gcc and GNU libtool bug, gcc is passing invalid flags and
libtool is silently hiding the fact. I understand that slibtool may be untested
in gcc, but since its actually doing the right thing here and has several
benefits over GNU libtool (Maintained and readable codebase) it would be very
appreciated if this can be fixed.

> Can you quote where the "invalid" -lvtv is present?

Honestly the gcc build system is confusing for me, but see this comment from
the gentoo issue.

https://bugs.gentoo.org/767706#c7

Briefly it explained that -lvtv comes from -fvtable-verify=std in a gcc spec
file and is propogated to Makefile.in by gcc/Makefile.def.

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