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Date:      Fri, 23 Jun 2017 01:01:33 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-toolchain@FreeBSD.org
Subject:   [Bug 220184] clang 4.0.0 segfaults on buildworld
Message-ID:  <bug-220184-29464-rVjuUOu9JV@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-220184-29464@https.bugs.freebsd.org/bugzilla/>
References:  <bug-220184-29464@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D220184

--- Comment #15 from Mark Millard <markmi@dsl-only.net> ---
(In reply to Mark Millard from comment #14)

My paragraph:

"If this were a general problem the build servers
would not be able to build the releases, ports,
and such."

was poorly chosen. I should have referred to just
test builds that are based on head, stable/11,
or the drafts of 11.1 . (I expect that there have
been many.) These likely start with
projects/clang*-import/ testing and continue with
head, stable/11, and the 11.1 drafts.

The official of releases and such likely are still
based on an older context building the newer
context. I do not know if they build and use a
bootstrap clang 4 and then use it or not when the
target is head, stable/11, or an 11.1 draft version
of some kind. It could be that only the system
compiler is built and installed but not used for
anything relative to buildworld buildkernel activity.

As I understand exp-runs were made for building
ports that were based on clang 4. This might
still be on-going.

My own activity is incremental updates of head,
so using clang 4 to build a bootstrap compiler
that is clang 4 when needed. Then using the
resultant clang 4 either way. (I ignore here
experimenting with devel/*xtoolchain* or using
gcc 4.2.1 where I have to [32-bit powerpc
kernel that finishes booting correctly].)

There is also likely activity of other people
working based on clang 4, including buildworld,
buildkernel, and building ports (ports that do
not force some gcc or some other toolchain).

I expect there is still enough activity based
on clang 4 that my overall argument structure
still holds: It would be good to try something
that matches a well used, well established
build configuration overall and see what
the status is for that build configuration.

I'll note that my activity is mostly based on
system-clang, not devel/llvm40 clang. Although
I have attempted devel/xtoolchain-llvm40 for
buildworld and buildkernel when there were
unusual failures like missing routines in
linking. (So far system-clang and
devel/xtoolchain-llvm40 have matched for such
build issues. But I've rarely tried this.)

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