On a powerpc64, system-clang crashes on audio/alsa-lib 's control.lo : "error in backend: A @@ version cannot be undefined"

The following is on a powerpc64 machine (old PowerMac G5 so-called
"Quad Core") running a personal build of head -r339076 that was
built via devel/powerpc64-xtoolchain-gcc and such (no gcc 4.2.1).
The compiler for the port build is system-clang (so clang 6 as cc),
not used for buildworld buildkernel. [I experiment with more modern
compilers and toolchains for some powerpc family members.]

The system is using base/binutils materials, such as for the
system-linker. (lld is not yet reasonable for powerpc64 as I
understand and the old system-binutils' ld is not sufficient
either.)

The port build is via ports-mgmt/poudriere-devel with -w . But it
looks like the /tmp/control-* files are not captured. It will
probably be 12 hours or more before the bulk build finishes, then
more time before I investigate/reproduce and get such files.

But for now here is an extraction from the log file:

--- control.lo ---
/bin/sh ../../libtool  --tag=CC    --mode=compile cc -DHAVE_CONFIG_H  -I. -I../../include  -I../../include -I/usr/ports/audio/alsa-lib/files   -O2 -pipe  -g -fno-strict-aliasing -MT control.lo -MD -MP -MF .deps/control.Tpo -c -o control.lo control.c
. . .
--- control.lo ---
libtool: compile:  cc -DHAVE_CONFIG_H -I. -I../../include -I../../include -I/usr/ports/audio/alsa-lib/files -O2 -pipe -g -fno-strict-aliasing -MT control.lo -MD -MP -MF .deps/control.Tpo -c control.c  -fPIC -DPIC -o .libs/control.o
. . .
--- control.lo ---
fatal error: error in backend: A @@ version cannot be undefined
cc: error: clang frontend command failed with exit code 70 (use -v to see invocation)
FreeBSD clang version 6.0.1 (tags/RELEASE_601/final 335540) (based on LLVM 6.0.1)
Target: powerpc64-unknown-freebsd12.0
Thread model: posix
InstalledDir: /usr/bin
cc: note: diagnostic msg: PLEASE submit a bug report to https://bugs.freebsd.org/submit/ and include the crash backtrace, preprocessed source, and associated run script.
cc: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
cc: note: diagnostic msg: /tmp/control-696205.c
cc: note: diagnostic msg: /tmp/control-696205.sh
cc: note: diagnostic msg: 

********************
*** [control.lo] Error code 1

make[3]: stopped in /wrkdirs/usr/ports/audio/alsa-lib/work/alsa-lib-1.1.2/src/control
1 error




For reference:

[06:50:02] [04] [00:02:54] Saved audio/alsa-lib | alsa-lib-1.1.2_1 wrkdir to: /usr/local/poudriere/data/wrkdirs/FBSDpowerpc64-default/default/alsa-lib-1.1.2_1.tbz
[06:50:05] [04] [00:02:57] Finished audio/alsa-lib | alsa-lib-1.1.2_1: Failed: build
[06:50:07] [04] [00:02:59] Skipping deskutils/lumina-archiver | lumina-archiver-1.4.1: Dependent port audio/alsa-lib | alsa-lib-1.1.2_1 failed
[06:50:07] [04] [00:02:59] Skipping deskutils/lumina-calculator | lumina-calculator-1.4.1: Dependent port audio/alsa-lib | alsa-lib-1.1.2_1 failed
[06:50:07] [04] [00:02:59] Skipping x11/lumina-core | lumina-core-1.4.1: Dependent port audio/alsa-lib | alsa-lib-1.1.2_1 failed
[06:50:07] [04] [00:02:59] Skipping x11/lumina-coreutils | lumina-coreutils-1.4.1: Dependent port audio/alsa-lib | alsa-lib-1.1.2_1 failed
[06:50:07] [04] [00:02:59] Skipping deskutils/lumina-fileinfo | lumina-fileinfo-1.4.1_1: Dependent port audio/alsa-lib | alsa-lib-1.1.2_1 failed
[06:50:07] [04] [00:02:59] Skipping deskutils/lumina-fm | lumina-fm-1.4.1: Dependent port audio/alsa-lib | alsa-lib-1.1.2_1 failed
[06:50:07] [04] [00:02:59] Skipping deskutils/lumina-mediaplayer | lumina-mediaplayer-1.4.1_1: Dependent port audio/alsa-lib | alsa-lib-1.1.2_1 failed
[06:50:07] [04] [00:02:59] Skipping deskutils/lumina-screenshot | lumina-screenshot-1.4.1: Dependent port audio/alsa-lib | alsa-lib-1.1.2_1 failed
[06:50:07] [04] [00:02:59] Skipping deskutils/lumina-textedit | lumina-textedit-1.4.1_1: Dependent port audio/alsa-lib | alsa-lib-1.1.2_1 failed
[06:50:07] [04] [00:02:59] Skipping multimedia/qt5-multimedia | qt5-multimedia-5.11.1: Dependent port audio/alsa-lib | alsa-lib-1.1.2_1 failed


===
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)

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