[Bug 221029] AMD Ryzen: strange compilation failures using poudriere or plain buildkernel/buildworld

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221029

--- Comment #52 from Don Lewis <truckman at FreeBSD.org> ---
Testing poudriere with SMT on, I got some more fallout:

  * The usual ghc SIGBUS failure

  * clang aborted while building cmake.  Unfortunately the build output
    isn't very verbose and it looks like the assert message got sent to
    /dev/null so I don't know if it the same assert failure as I observed
    in the buildworld/buildkernel tests.

The cmake failure caused *many* ports to be skipped.  When I restarted
poudriere, most stuff built successfully, but chromium failed due to the rename
problem:

[273/350] CXX tools/gn/bundle_data.o
FAILED: tools/gn/bundle_data.o
clang++40 -MMD -MF tools/gn/bundle_data.o.d 
-I/wrkdirs/usr/ports/www/chromium/w
ork/chromium-59.0.3071.115/out_bootstrap/gen
-I/wrkdirs/usr/ports/www/chromium/w
ork/chromium-59.0.3071.115 -DNO_TCMALLOC -D__STDC_FORMAT_MACROS -O2 -g0
-D_FILE_
OFFSET_BITS=64 -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -pthread -pipe
-f
no-exceptions -Wno-deprecated-register -Wno-parentheses-equality -std=c++11
-Wno
-c++11-narrowing -c
/wrkdirs/usr/ports/www/chromium/work/chromium-59.0.3071.115/
tools/gn/bundle_data.cc -o tools/gn/bundle_data.o
error: unable to rename temporary 'tools/gn/bundle_data.o-d63e9b2a' to output
fi
le 'tools/gn/bundle_data.o': 'No such file or directory'
1 error generated.


No segfaults, though.

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