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I was just reading this:
https://www.phoronix.com/scan.php?page= … -Platforms
...so i was wondering how arch will pick that up.
By now it is limited to nightly builds, but since firefox 64 that change will be expanded to stable releases too.
So the question is: do we have to expect "arch's firefox" to be built the way upstream does or it will continue to use gcc?
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It's hardly surprising I guess, that it looks like Mozilla never bothered to figure out the comparative improvements when using PGO with *modern* gcc, vs. clang... due to not bothering to figure out how to actually make it compile that way in the first place.
Anyway, which compiler toolchain to use is kind of a subjective thing. If it lets us compile successfully with PGO I guess we might do it.
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Using clang seems logical since llvm is necessary for the included rust code anyways.
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Seen on IRC:
03:00 PM <Jesin> heftig: https://glandium.org/blog/?p=3888 may be relevant for us
03:00 PM <@phrik> Title:glandium.org » Blog Archive » Firefox is now built with clang LTO on all* platforms (at glandium.org)
03:01 PM <heftig> Jesin: already applied to firefox-nightly
03:01 PM <Jesin> yay
03:03 PM <Jesin> heftig: does that include the profile-guided optimizations?
03:03 PM <heftig> yes
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Will the PGO data be added to the sources as well for reproducibility?
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