[Bug lto/77821] C++ binary size increase or LTO not working?

[tulipawn at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77821

--- Comment #7 from PeteVine <tulipawn at gmail dot com> ---
The bug doesn't occur on an aarch64 system (built with gcc5):

$ du ufo-arm64-gcc*
3312    ufo-arm64-gcc5
3072    ufo-arm64-gcc5-lto
3256    ufo-arm64-gcc6
3056    ufo-arm64-gcc6-lto
3288    ufo-arm64-gcc7
3040    ufo-arm64-gcc7-lto

This could mean the issue revolves around C++ gcc4 ABI and libraries built with
different libstdc++/gcc versions. Does that sound plausible? (everything works
perfectly fine at runtime and there must be a reason the problem starts
occurring at gcc5 boundary)

The previous comment might be completely tangential to this issue.