[Bug lto/86490] lto1: fatal error: multiple prevailing defs

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86490

--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Alexander Monakov from comment #2)
> Note that Gold does not exhibit this issue. I think ld.bfd is at fault here.

It is because gold doesn't check archive for a common definition.

> We've hit similar issues with some internal plugin development. The main
> issue is, ld.bfd feeds the plugin with objects extracted from static
> archives, but those objects do not satisfy any unresolved references and
> would not be extracted in the first place in non-LTO link. So ld.bfd is
> causing useless extra work both for itself and the compiler plugin.
> 

Is there a common symbol involved?