The llvm-next build of Whirlwind failed in the unit test stage, failing to build chromeos-base/ap-wireless.  The error message is: 

ap-wireless-0.0.1-r2093: [495/496] LINK ap-wireless_unittest
ap-wireless-0.0.1-r2093: FAILED: ap-wireless_unittest 
ap-wireless-0.0.1-r2093: armv7a-cros-linux-gnueabihf-clang++ -coverage -Wl,-O2 -Wl,--as-needed  -Wl,-z,relro -Wl,-z,noexecstack -Wl,-z,now -Wl,--as-needed --sysroot=/build/whirlwind -Wl,-O2 -Wl,--as-needed  -Wl,-z,relro -Wl,-z,noexecstack -Wl,-z,now -Wl,--as-needed --sysroot=/build/whirlwind -Wl,-O2 -Wl,--as-needed  -Wl,-z,relro -Wl,-z,noexecstack -Wl,-z,now -Wl,--as-needed --sysroot=/build/whirlwind -Wl,-O2 -Wl,--as-needed  -Wl,-z,relro -Wl,-z,noexecstack -Wl,-z,now -Wl,--as-needed --sysroot=/build/whirlwind -Wl,-O2 -Wl,--as-needed  -Wl,-z,relro -Wl,-z,noexecstack -Wl,-z,now -Wl,--as-needed --sysroot=/build/whirlwind -Wl,-O2 -Wl,--as-needed  -Wl,-z,relro -Wl,-z,noexecstack -Wl,-z,now -Wl,--as-needed --sysroot=/build/whirlwind -Wl,-O2 -Wl,--as-needed  -Wl,-z,relro -Wl,-z,noexecstack -Wl,-z,now -Wl,--as-needed --sysroot=/build/whirlwind -Wl,-O2 -Wl,--as-needed  -Wl,-z,relro -Wl,-z,noexecstack -Wl,-z,now -Wl,--as-needed --sysroot=/build/whirlwind -Wl,-O2 -Wl,--as-needed  -Wl,-z,relro 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-L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -L/build/whirlwind/usr/lib -pthread -o ap-wireless_unittest -Wl,--start-group platform/ap/wireless/backhaul-manager/ap-wireless_unittest.phy_channel_manager_test.o platform/ap/wireless/group-manager/ap-wireless_unittest.background_registration_manager_test.o platform/ap/wireless/group-manager/ap-wireless_unittest.ble_diagnostic_helper_test.o platform/ap/wireless/group-manager/ap-wireless_unittest.ble_security_manager_test.o platform/ap/wireless/group-manager/ap-wireless_unittest.ble_vorlon_helper_test.o platform/ap/wireless/group-manager/ap-wireless_unittest.diffie_hellman_test.o platform/ap/wireless/group-manager/ap-wireless_unittest.encryption_test.o platform/ap/wireless/group-manager/ap-wireless_unittest.gatt_characteristic_adaptor_test.o platform/ap/wireless/group-monitor/ap-wireless_unittest.group_monitor_test.o platform/ap/wireless/optimizer/ap-wireless_unittest.empty_test.o platform/ap/wireless/optimizer/ap-wireless_unittest.optimizer_daemon_test.o platform/ap/wireless/optimizer/ap-wireless_unittest.station_policy_configure_test.o platform/ap/wireless/wifiblaster/ap-wireless_unittest.transfer_sampler_test.o platform/ap/wireless/wifiblaster/ap-wireless_unittest.packet_generator_test.o platform/ap/wireless/libbackground-registration.a platform/ap/wireless/libapbackhaulmanager.a platform/ap/wireless/libapgroupmanager.a platform/ap/wireless/libapgroupmonitor.a platform/ap/wireless/liboptimizer.a platform/ap/wireless/libregistration-info-proto.a platform/ap/wireless/libstorage-proto.a platform/ap/wireless/libtransfer-sampler.a platform/ap/wireless/libpacket-generator.a platform/ap/wireless/libbackground_registration-proto.a platform/ap/wireless/libdatapol-proto.a platform/ap/wireless/libapcommon.a platform/ap/wireless/libap_operational_stats-proto.a platform/ap/wireless/libwifi_interface-proto.a platform/ap/wireless/libelapsed_time_recorder.a platform/ap/wireless/libstatistics.a platform/ap/wireless/libcommand_response-proto.a platform/ap/wireless/libgcm_device_messages-proto.a platform/ap/wireless/libinterface_names.a platform/ap/wireless/libnetmgr_client_shill.a platform/ap/wireless/libip-address.a platform/ap/wireless/libplatform-api.a platform/ap/wireless/libplatform-api-cros.a platform/ap/wireless/libcert-util.a platform/ap/wireless/libaplogger.a platform/ap/wireless/libplatform-information.a platform/ap/wireless/libplatform-info-proto.a platform/ap/wireless/libstats-proto.a platform/ap/wireless/libruntime_state-proto.a platform/ap/wireless/libhal-message-proto.a platform/ap/wireless/libupdate-engine-common-client.a platform/ap/wireless/libdevice-configuration.a platform/ap/wireless/libnetwork_runtime_state-proto.a platform/ap/wireless/libhostapd-commands.a platform/ap/wireless/libhostapd-interface.a platform/ap/wireless/libhostapd-monitor.a platform/ap/wireless/libstate-machine.a platform/ap/wireless/libjob_controller_client_static.a platform/ap/wireless/libnetwork-overlap-check.a platform/ap/wireless/libpppoe-prober.a platform/ap/wireless/libsetup-network.a platform/ap/wireless/libstation-mode.a platform/ap/wireless/libwan-configuration.a platform/ap/wireless/libweb-server-proxy.a platform/ap/wireless/libip-address-manager.a platform/ap/wireless/libpacket-proto.a platform/ap/wireless/libclient-steering-proto.a platform/ap/wireless/libevent-proto.a platform/ap/wireless/libiapc-proto.a platform/ap/wireless/libmesh-node-info-proto.a platform/ap/wireless/libjson-reader-writer.a platform/ap/wireless/liblink-quality-metric-proto.a platform/ap/wireless/libwireless-policy-proto.a platform/ap/wireless/libxsrf-aware-http-transport.a -Wl,--end-group  -lgcov -lgtest_main -lgtest -pthread -lpthread -lgmock -lcert_provision -lshill-net-456626 -lwebserv-456626 -lre2 -lmetrics-456626 -lexpat -lprotobuf -lpthread -lbrillo-test-456626 -lbase-456626 -ldbus-1 -lssl -lcrypto -lcurl -lbrillo-456626 -lbase-test-456626 -lvboot_host -lmtdutils
ap-wireless-0.0.1-r2093: /usr/x86_64-pc-linux-gnu/armv7a-cros-linux-gnueabihf/binutils-bin/2.27.0/ld.gold.real: error: /usr/lib64/clang/8.0.0/lib/linux/libclang_rt.profile-armhf.a(GCDAProfiling.c.o): multiple definition of '__gcov_flush'
ap-wireless-0.0.1-r2093: /usr/x86_64-pc-linux-gnu/armv7a-cros-linux-gnueabihf/binutils-bin/2.27.0/ld.gold.real: /usr/bin/../lib/gcc/armv7a-cros-linux-gnueabihf/4.9.x/libgcov.a(_gcov_flush.o): previous definition here
ap-wireless-0.0.1-r2093: /var/tmp/portage/cross-armv7a-cros-linux-gnueabihf/gcc-4.9.2-r198/work/gcc-4.9.2/gcc-4.9/libgcc/libgcov-driver.c:1430: error: undefined reference to '__gcov_sampling_period'
ap-wireless-0.0.1-r2093: /var/tmp/portage/cross-armv7a-cros-linux-gnueabihf/gcc-4.9.2-r198/work/gcc-4.9.2/gcc-4.9/libgcc/dyn-ipa.c:257: error: undefined reference to '__gcov_lipo_dump_cgraph'
ap-wireless-0.0.1-r2093: /var/tmp/portage/cross-armv7a-cros-linux-gnueabihf/gcc-4.9.2-r198/work/gcc-4.9.2/gcc-4.9/libgcc/dyn-ipa.c:1146: error: undefined reference to '__gcov_lipo_cutoff'
ap-wireless-0.0.1-r2093: /var/tmp/portage/cross-armv7a-cros-linux-gnueabihf/gcc-4.9.2-r198/work/gcc-4.9.2/gcc-4.9/libgcc/dyn-ipa.c:536: error: undefined reference to '__gcov_lipo_grouping_algorithm'
ap-wireless-0.0.1-r2093: /var/tmp/portage/cross-armv7a-cros-linux-gnueabihf/gcc-4.9.2-r198/work/gcc-4.9.2/gcc-4.9/libgcc/dyn-ipa.c:536: error: undefined reference to '__gcov_lipo_merge_modu_edges'
ap-wireless-0.0.1-r2093: /var/tmp/portage/cross-armv7a-cros-linux-gnueabihf/gcc-4.9.2-r198/work/gcc-4.9.2/gcc-4.9/libgcc/dyn-ipa.c:536: error: undefined reference to '__gcov_lipo_weak_inclusion'
ap-wireless-0.0.1-r2093: /var/tmp/portage/cross-armv7a-cros-linux-gnueabihf/gcc-4.9.2-r198/work/gcc-4.9.2/gcc-4.9/libgcc/dyn-ipa.c:536: error: undefined reference to '__gcov_lipo_max_mem'
ap-wireless-0.0.1-r2093: /var/tmp/portage/cross-armv7a-cros-linux-gnueabihf/gcc-4.9.2-r198/work/gcc-4.9.2/gcc-4.9/libgcc/dyn-ipa.c:536: error: undefined reference to '__gcov_lipo_comdat_algorithm'
ap-wireless-0.0.1-r2093: /var/tmp/portage/cross-armv7a-cros-linux-gnueabihf/gcc-4.9.2-r198/work/gcc-4.9.2/gcc-4.9/libgcc/dyn-ipa.c:2145: error: undefined reference to '__gcov_lipo_propagate_scale'
ap-wireless-0.0.1-r2093: /var/tmp/portage/cross-armv7a-cros-linux-gnueabihf/gcc-4.9.2-r198/work/gcc-4.9.2/gcc-4.9/libgcc/dyn-ipa.c:3113: error: undefined reference to '__gcov_lipo_random_group_size'
ap-wireless-0.0.1-r2093: /var/tmp/portage/cross-armv7a-cros-linux-gnueabihf/gcc-4.9.2-r198/work/gcc-4.9.2/gcc-4.9/libgcc/dyn-ipa.c:3113: error: undefined reference to '__gcov_lipo_comdat_algorithm'
ap-wireless-0.0.1-r2093: /var/tmp/portage/cross-armv7a-cros-linux-gnueabihf/gcc-4.9.2-r198/work/gcc-4.9.2/gcc-4.9/libgcc/dyn-ipa.c:3113: error: undefined reference to '__gcov_lipo_random_seed'
ap-wireless-0.0.1-r2093: /var/tmp/portage/cross-armv7a-cros-linux-gnueabihf/gcc-4.9.2-r198/work/gcc-4.9.2/gcc-4.9/libgcc/libgcov-interface.c:130: error: undefined reference to '__gcov_test_coverage'
ap-wireless-0.0.1-r2093: /var/tmp/portage/cross-armv7a-cros-linux-gnueabihf/gcc-4.9.2-r198/work/gcc-4.9.2/gcc-4.9/libgcc/libgcov-interface.c:244: error: undefined reference to '__gcov_has_sampling'
ap-wireless-0.0.1-r2093: /var/tmp/portage/cross-armv7a-cros-linux-gnueabihf/gcc-4.9.2-r198/work/gcc-4.9.2/gcc-4.9/libgcc/libgcov-interface.c:244: error: undefined reference to '__gcov_sampling_period'
ap-wireless-0.0.1-r2093: /var/tmp/portage/cross-armv7a-cros-linux-gnueabihf/gcc-4.9.2-r198/work/gcc-4.9.2/gcc-4.9/libgcc/libgcov-interface.c:251: error: undefined reference to '__gcov_has_sampling'
ap-wireless-0.0.1-r2093: /var/tmp/portage/cross-armv7a-cros-linux-gnueabihf/gcc-4.9.2-r198/work/gcc-4.9.2/gcc-4.9/libgcc/libgcov-interface.c:263: error: undefined reference to '__gcov_profile_prefix'
ap-wireless-0.0.1-r2093: clang-8: error: linker command failed with exit code 1 (use -v to see invocation)
ap-wireless-0.0.1-r2093: ninja: build stopped: subcommand failed.
ap-wireless-0.0.1-r2093: platform2.py: Unhandled exception:
ap-wireless-0.0.1-r2093: Traceback (most recent call last):
ap-wireless-0.0.1-r2093:   File "/build/whirlwind/tmp/portage/chromeos-base/ap-wireless-0.0.1-r2093/work/ap-wireless-0.0.1/platform2/common-mk/platform2.py", line 446, in <module>
ap-wireless-0.0.1-r2093:     commandline.ScriptWrapperMain(lambda _: main)
ap-wireless-0.0.1-r2093:   File "/usr/lib64/python2.7/site-packages/chromite/lib/commandline.py", line 912, in ScriptWrapperMain
ap-wireless-0.0.1-r2093:     ret = target(argv[1:])
ap-wireless-0.0.1-r2093:   File "/build/whirlwind/tmp/portage/chromeos-base/ap-wireless-0.0.1-r2093/work/ap-wireless-0.0.1/platform2/common-mk/platform2.py", line 442, in main
ap-wireless-0.0.1-r2093:     getattr(p2, options.action)(options.args)
ap-wireless-0.0.1-r2093:   File "/build/whirlwind/tmp/portage/chromeos-base/ap-wireless-0.0.1-r2093/work/ap-wireless-0.0.1/platform2/common-mk/platform2.py", line 384, in compile
ap-wireless-0.0.1-r2093:     cros_build_lib.RunCommand(ninja_args)
ap-wireless-0.0.1-r2093:   File "/usr/lib64/python2.7/site-packages/chromite/lib/cros_build_lib.py", line 646, in RunCommand
ap-wireless-0.0.1-r2093:     raise RunCommandError(msg, cmd_result)
ap-wireless-0.0.1-r2093: chromite.lib.cros_build_lib.RunCommandError: return code: 1; command: ninja -C /build/whirlwind/var/cache/portage/chromeos-base/ap-wireless/out/Default -j 32 all
ap-wireless-0.0.1-r2093: cmd=['ninja', '-C', '/build/whirlwind/var/cache/portage/chromeos-base/ap-wireless/out/Default', '-j', '32', 'all']
ap-wireless-0.0.1-r2093:  * ERROR: chromeos-base/ap-wireless-0.0.1-r2093::jetstream-private failed (compile phase):
ap-wireless-0.0.1-r2093:  *   (no error message)
ap-wireless-0.0.1-r2093:  * 
ap-wireless-0.0.1-r2093:  * Call stack:
ap-wireless-0.0.1-r2093:  *     ebuild.sh, line  133:  Called src_compile
ap-wireless-0.0.1-r2093:  *   environment, line 4409:  Called platform_src_compile
ap-wireless-0.0.1-r2093:  *   environment, line 3998:  Called platform 'compile' 'all'
ap-wireless-0.0.1-r2093:  *   environment, line 3955:  Called die
ap-wireless-0.0.1-r2093:  * The specific snippet of code:
ap-wireless-0.0.1-r2093:  *       "${cmd[@]}" || die
ap-wireless-0.0.1-r2093:  * 
ap-wireless-0.0.1-r2093:  * If you need support, post the output of `emerge --info '=chromeos-base/ap-wireless-0.0.1-r2093::jetstream-private'`,
ap-wireless-0.0.1-r2093:  * the complete build log and the output of `emerge -pqv '=chromeos-base/ap-wireless-0.0.1-r2093::jetstream-private'`.
ap-wireless-0.0.1-r2093:  * The complete build log is located at '/build/whirlwind/tmp/portage/logs/chromeos-base:ap-wireless-0.0.1-r2093:20181218-223936.log'.
ap-wireless-0.0.1-r2093:  * For convenience, a symlink to the build log is located at '/build/whirlwind/tmp/portage/chromeos-base/ap-wireless-0.0.1-r2093/temp/build.log'.
ap-wireless-0.0.1-r2093:  * The ebuild environment file is located at '/build/whirlwind/tmp/portage/chromeos-base/ap-wireless-0.0.1-r2093/temp/environment'.
ap-wireless-0.0.1-r2093:  * Working directory: '/build/whirlwind/tmp/portage/chromeos-base/ap-wireless-0.0.1-r2093/work/ap-wireless-0.0.1/platform/ap/wireless'
ap-wireless-0.0.1-r2093:  * S: '/build/whirlwind/tmp/portage/chromeos-base/ap-wireless-0.0.1-r2093/work/ap-wireless-0.0.1/platform/ap/wireless'
ap-wireless-0.0.1-r2093: >>> Failed to emerge chromeos-base/ap-wireless-0.0.1-r2093 for /build/whirlwind/, Log file:


A link to the entire build log is here: 
https://luci-logdog.appspot.com/logs/chromeos/buildbucket/cr-buildbucket.appspot.com/8926778314490472720/+/steps/UnitTest/0/stdout