[llvm-dev] Always running Regular LTO before ThinLTO?

[Arthur Eubanks via llvm-dev]

Ah I messed something up locally, removing the regular LTO run
causes undefined hidden symbol errors for vtables.
The `runRegularLTO()` name is confusing though, it apparently sets up some
things necessary for ThinLTO.

On Mon, May 24, 2021 at 11:58 AM Arthur Eubanks <aeubanks at google.com> wrote:

> While debugging a ThinLTO issue, I noticed that passes were running more
> often than I expected. This is being invoked pretty normally, something like
> $ clang++ -fuse-ld=lld -flto=thin
>
> Looks like at [1] we try to first run regular LTO before running ThinLTO.
> Removing the first line makes the link go from 208s to 115s. Is this
> expected behavior?
>
> [1]:
> https://github.com/llvm/llvm-project/blob/a64ebb8637277998f77e55d335faca6fdcf5859b/llvm/lib/LTO/LTO.cpp#L1033
>
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