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[Bug ld/26766] Support standalone PGO build

From: hjl.tools at gmail dot com
Subject: [Bug ld/26766] Support standalone PGO build
Date: Mon, 26 Oct 2020 15:29:57 +0000


--- Comment #11 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Martin Liska from comment #10)

> - about the --enable-pgo-bootstrap=lto, I would recommend adding an
> orthogonal option: --enable-lto-build where it will append -flto=jobserver
> and will be independent to --enable-pgo-bootstrap as I asked in the original
> comment.

I pass -flto=jobserver to the PGO build.  The separate --enable-lto-build
isn't very useful.  You can build binutils with LTO by passing -flto to
CFLAGS. I will rename --enable-pgo-bootstrap=lto to --enable-pgo-build=lto
since the newly built binutils is used only for PGO training.

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