Build support for virtual table verification (a C++ hardening feature). This does not control whether GCC defaults to using VTV> Note that actually using VTV breaks ABI and hence the whole system must be built with -fvtable-verify.

Packages describing “vtv” as local USE flag

Package “vtv” Flag Description
sys-devel/gcc Build support for virtual table verification (a C++ hardening feature). This does not control whether GCC defaults to using VTV> Note that actually using VTV breaks ABI and hence the whole system must be built with -fvtable-verify.
dev-lang/gnat-gpl Build support for virtual table verification (a C++ hardening feature)

All packages providing a “vtv” USE flag (2)