From owner-freebsd-ports@freebsd.org  Wed Apr 12 03:43:10 2017
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Date: Wed, 12 Apr 2017 03:43:08 +0000
From: Alexey Dokuchaev <danfe@FreeBSD.org>
To: ports@FreeBSD.org
Subject: LLVM port(s) take very long time to package
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Hi there porters,

It had been annoying me for a while, so I figured I try asking here:
LLVM ports (particularly, llvm39-3.9.1) take abnormally long time to
package, e.g. right now it took 43 minutes (tmpfs-backed build area,
pkg-1.10.0_2.txz, AMD A8 APU @1900 MHz, plenty of RAM, no swap).

pkg was eating 100% (of a single core) during that time, so it looks
like it's actually busy (not waiting for I/O or something), but with
what?  And can it be fixed?  LLVM ports are real PITA to (re)build,
and while ccache helps to greatly reduce the build times, 3/4-hour
package time still cripples it.

./danfe