[PATCH] D72404: [ThinLTO/FullLTO] Support Os and Oz

[Mehdi AMINI via Phabricator via cfe-commits]

mehdi_amini added a comment.

In D72404#3304205 <https://reviews.llvm.org/D72404#3304205>, @aykevl wrote:

> I would be very interested in this patch, because for me to use ThinLTO without size regressions I need to set the optimization size level in the linker (`PassManagerBuilder.SizeLevel` etc).

Why can't you build the object files with `-Os` in the first place instead of changing the optimization level between the compilation and the linking phases?


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