mehdi_amini added a comment.

In https://reviews.llvm.org/D28404#640178, @mehdi_amini wrote:

> Also, that's not practicable: what if I have an LTO static library for which 
> I don't have the source, now if I build my own file with -O0 -flto I can't 
> link anymore.


Also: LTO is required for some features likes CFI. There are users who wants 
CFI+O0 during development (possibly for debugging a subcomponent of the app).


https://reviews.llvm.org/D28404



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