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From: Jan Beich <jbeich@FreeBSD.org>
To: Patrick Dorion <dorionpatrick@outlook.com>
Cc: "jonc\@chen.org.nz" <jonc@chen.org.nz>, "lists\@opsec.eu" <lists@opsec.eu>,
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Subject: Re: Firefox (Doesn't) Build
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Date: Sun, 12 Nov 2017 01:55:35 +0100
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Patrick Dorion <dorionpatrick@outlook.com> writes:

> What's the difference between using Poudriere or Synth, though?
>
> This is a clean system, I can't imagine a jail being cleaner... it was
> unpacked from the DVD the day before yesterday....
>
> Also, how do you run PGO (profile-guided optimizations) while building
> in a jail?  You need a running X server and access to it for that....

PGO is simply broken for architectures that default to libc++.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223563