Cannot build with -flto

[ZeroChaos-]

Link time optimization is increasingly common across linux distros, but this fails to build on gentoo when lto is enabled.

I would expect this is easy to replicate with CFLAGS=-flto -Werror=odr -Werror=lto-type-mismatch -Werror=strict-aliasing

Gentoo Bug https://bugs.gentoo.org/861872