[stevenhuang]

When talking about LTO we don't expect it to be removing code used in runtime. Such code is not dead code, by definition.

If you want to disable certain runtime features, you'd do so with feature flags.

[whstl]

Sure, but I'm talking about bloat in libraries that don't get LTO'd. If there are no feature flags and no plugin functionality, LTO can't do its job. There are plenty of non-core libraries like this.