after upgrade to gcc9.3 linking segfaults in lto-wrapper but LTO is disabled...

Fri Apr 24 11:18:23 GMT 2020

I just upgraded gcc form 7.5 to 9.3 and started to have gcc linker segfault - but only on armv7 target
(the same sources are building/linking OK for aarch64/x86_64 targets).

Segfault is in lto-wrapper - but I disabled LTO so I'm a bit confused….

pls see below gcc linking output.

I’m trying understand why segfault is in lto_wraper when lto is disabled? 

Basically I see 3 opts: 
a\ in reality lto is enabled; 
b\ lto is disabled but gcc errantly still goes with it; 
c\ it is normal gcc runs lto_wrapper even without lto. 

I want to first eliminate a\. 

When b\ or c\ left: probably most effective will be to find link params allowing to link ok on armv7 as filling bug. rep. will hold my development process till gcc team resolves issue….

May somebody hint me how to progress with this?

armv7a-minimyth-linux-gnueabihf-g++ -v -Wl,-O1 -Wl,-rpath,/usr/lib/qt5/lib -Wl,-rpath,/usr/lib/qt5/lib -shared -Wl,-soname,libmythtv-32.so.32 -o libmythtv-32.so.32.0.0 obj/cc.o obj/vbi.o obj/lang.o obj/recordinginfo.o obj/dbcheck.o obj/videodbcheck.o obj/tvremoteutil.o obj/tv.o obj/jobqueue.o obj/recordingprofile.o obj/remoteencoder.o obj/videosource.o obj/cardutil.o obj/sourceutil.o obj/videometadatautil.o obj/vbi608extractor.o obj/cc608decoder.o obj/cc608reader.o obj/cc708decoder.o obj/cc708reader.o obj/cc708window.o obj/subtitlereader.o obj/scheduledrecording.o obj/signalmonitorvalue.o obj/livetvchain.o obj/playgroup.o obj/channelsettings.o obj/previewgenerator.o obj/previewgeneratorqueue.o obj/transporteditor.o obj/channelgroup.o obj/recordingrule.o obj/mythsystemevent.o obj/mythmediabuffer.o obj/mythavformatbuffer.o obj/mythfilebuffer.o obj/mythstreamingbuffer.o obj/mythinteractivebuffer.o obj/mythopticalbuffer.o obj/metadataimagehelper.o obj/mythframe.o obj/mythavutil.o obj/recordingfile.o obj/diseqc.o obj/diseqcsettings.o obj/mythmediawriter.o obj/mythavformatwriter.o obj/mythfifowriter.o obj/teletextdecoder.o obj/teletextreader.o obj/vbilut.o obj/tspacket.o obj/pespacket.o obj/mpegtables.o obj/atsctables.o obj/dvbtables.o obj/premieretables.o obj/sctetables.o obj/mpegstreamdata.o obj/atscstreamdata.o obj/dvbstreamdata.o obj/scanstreamdata.o obj/mpegdescriptors.o obj/atscdescriptors.o obj/dvbdescriptors.o obj/sctedescriptors.o obj/splicedescriptors.o obj/dishdescriptors.o obj/premieredescriptors.o obj/atsc_huffman.o obj/freesat_huffman.o obj/iso6937tables.o obj/H264Parser.o obj/tablestatus.o obj/tsstreamdata.o obj/frequencies.o obj/frequencytables.o obj/channelutil.o obj/channelinfo.o obj/dtvmultiplex.o obj/dtvconfparser.o obj/dtvconfparserhelpers.o obj/scaninfo.o obj/channelimporter.o obj/iptvchannelfetcher.o obj/srtwriter.o obj/mythdvdbuffer.o obj/mythdvdcontext.o obj/mythdvdinfo.o obj/mythdvdstream.o obj/mythdvdplayer.o obj/mythdvddecoder.o obj/mythbdiowrapper.o obj/mythbdbuffer.o obj/mythbdinfo.o obj/mythbdoverlay.o obj/mythbdplayer.o obj/mythbddecoder.o obj/mythbdoverlayscreen.o obj/httplivestream.o obj/httplivestreambuffer.o obj/m3u.o obj/profilegroup.o obj/tv_play.o obj/mythplayer.o obj/audioplayer.o obj/mythccextractorplayer.o obj/teletextextractorreader.o obj/playercontext.o obj/tv_play_win.o obj/deletemap.o obj/mythcommflagplayer.o obj/commbreakmap.o obj/tvbrowsehelper.o obj/netstream.o obj/mythiowrapper.o obj/textsubtitleparser.o obj/xine_demux_sputext.o obj/decoderbase.o obj/nuppeldecoder.o obj/avformatdecoder.o obj/privatedecoder.o obj/mythcodeccontext.o obj/osd.o obj/teletextscreen.o obj/subtitlescreen.o obj/interactivescreen.o obj/mythvideoout.o obj/mythvideooutnull.o obj/videobuffers.o obj/jitterometer.o obj/videodisplayprofile.o obj/mythcodecid.o obj/videooutwindow.o obj/videocolourspace.o obj/videovisual.o obj/mythdeinterlacer.o obj/mythvaapicontext.o obj/mythdrmprimecontext.o obj/mythopenglvideo.o obj/mythvideooutopengl.o obj/mythopenglinterop.o obj/mythvideotexture.o obj/mythopengltonemap.o obj/mythvaapiinterop.o obj/mythvaapiglxinterop.o obj/mythdrmprimeinterop.o obj/mythegldmabuf.o obj/mythvaapidrminterop.o obj/filters.o obj/goom_core.o obj/graphic.o obj/tentacle3d.o obj/ifs.o obj/ifs_display.o obj/lines.o obj/surf3d.o obj/zoom_filter_mmx.o obj/zoom_filter_xmmx.o obj/videovisualgoom.o obj/DetectLetterbox.o obj/mythairplayserver.o obj/mythraopdevice.o obj/mythraopconnection.o obj/dsmcc.o obj/dsmcccache.o obj/dsmccbiop.o obj/dsmccobjcarousel.o obj/mhegic.o obj/interactivetv.o obj/mhi.o obj/channelbase.o obj/dtvchannel.o obj/signalmonitor.o obj/dtvsignalmonitor.o obj/inputinfo.o obj/scanwizard.o obj/channelscan_sm.o obj/channelscanner.o obj/channelscanner_gui.o obj/channelscanner_gui_scan_pane.o obj/channelscanner_cli.o obj/frequencytablesetting.o obj/inputselectorsetting.o obj/multiplexsetting.o obj/paneanalog.o obj/scanmonitor.o obj/scanwizardconfig.o obj/externrecscanner.o obj/eithelper.o obj/eitscanner.o obj/eitfixup.o obj/eitcache.o obj/programdata.o obj/tv_rec.o obj/recordingquality.o obj/recorderbase.o obj/DeviceReadBuffer.o obj/dtvrecorder.o obj/importrecorder.o obj/RTjpegN.o obj/audioinput.o obj/audioinputalsa.o obj/audioinputoss.o obj/v4lrecorder.o obj/v4l2util.o obj/v4lchannel.o obj/analogsignalmonitor.o obj/v4l2encrecorder.o obj/v4l2encstreamhandler.o obj/v4l2encsignalmonitor.o obj/mythv4l2m2mcontext.o obj/firewirechannel.o obj/firewirerecorder.o obj/firewiresignalmonitor.o obj/firewiredevice.o obj/avcinfo.o obj/linuxfirewiredevice.o obj/linuxavcinfo.o obj/cetonrtsp.o obj/iptvchannel.o obj/iptvrecorder.o obj/iptvsignalmonitor.o obj/iptvstreamhandler.o obj/streamhandler.o obj/packetbuffer.o obj/rtppacketbuffer.o obj/httptsstreamhandler.o obj/hlsstreamhandler.o obj/HLSPlaylistWorker.o obj/HLSReader.o obj/HLSSegment.o obj/HLSStream.o obj/HLSStreamWorker.o obj/vboxutils.o obj/vboxchannelfetcher.o obj/mpegrecorder.o obj/ExternalChannel.o obj/ExternalRecChannelFetcher.o obj/ExternalRecorder.o obj/ExternalStreamHandler.o obj/ExternalSignalMonitor.o obj/dvbtypes.o obj/dvbchannel.o obj/dvbsignalmonitor.o obj/dvbcam.o obj/dvbrecorder.o obj/dvbstreamhandler.o obj/dvbci.o obj/moc_jobqueue.o obj/moc_recordingprofile.o obj/moc_videosource.o obj/moc_playgroup.o obj/moc_channelsettings.o obj/moc_previewgenerator.o obj/moc_previewgeneratorqueue.o obj/moc_transporteditor.o obj/moc_mythsystemevent.o obj/moc_diseqcsettings.o obj/moc_profilegroup.o obj/moc_tv_play.o obj/moc_tv_play_win.o obj/moc_netstream.o obj/moc_osd.o obj/moc_videooutwindow.o obj/moc_videocolourspace.o obj/moc_mythopenglvideo.o obj/moc_mythopenglinterop.o obj/moc_mythopengltonemap.o obj/moc_mythvaapiglxinterop.o obj/moc_mythairplayserver.o obj/moc_mythraopdevice.o obj/moc_mythraopconnection.o obj/moc_mhegic.o obj/moc_scanwizard.o obj/moc_channelscanner_gui.o obj/moc_channelscanner_gui_scan_pane.o obj/moc_inputselectorsetting.o obj/moc_multiplexsetting.o 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obj/moc_tv_play.o obj/moc_tv_play_win.o obj/moc_netstream.o obj/moc_osd.o obj/moc_videooutwindow.o obj/moc_videocolourspace.o obj/moc_mythopenglvideo.o obj/moc_mythopenglinterop.o obj/moc_mythopengltonemap.o obj/moc_mythvaapiglxinterop.o obj/moc_mythairplayserver.o obj/moc_mythraopdevice.o obj/moc_mythraopconnection.o obj/moc_mhegic.o obj/moc_scanwizard.o obj/moc_channelscanner_gui.o obj/moc_channelscanner_gui_scan_pane.o obj/moc_inputselectorsetting.o obj/moc_multiplexsetting.o obj/moc_paneatsc.o obj/moc_panedvbutilsimport.o obj/moc_scanmonitor.o obj/moc_scanwizardconfig.o obj/moc_cetonrtsp.o obj/moc_iptvchannel.o obj/moc_iptvstreamhandler.o obj/moc_httptsstreamhandler.o -lmythdvdnav-32 -lmythudfread-32 -lva-glx -lmythswresample -lmyth-32 -lmythswscale -lmythavformat -lmythavcodec -lmythavutil -lmythpostproc -lmythavfilter -lmythui-32 -lmythupnp-32 -lmythbase-32 -lmythservicecontracts-32 -lmythfreemheg-32 -llzo2 -lXext -lXinerama -lXxf86vm -lXrandr -ldns_sd -lcrypto -lass -lEGL -lva-x11 -lX11 -lva-drm -lva -lasound -lfreetype -ldrm -lxml2 -lz -lbluray -lsamplerate -lraw1394 -liec61883 -lavc1394 -lrom1394 -ldl -lpthread /home/piotro/minimyth-dev/images/main/usr/lib/qt5/lib/libQt5Widgets.so /home/piotro/minimyth-dev/images/main/usr/lib/qt5/lib/libQt5Gui.so /home/piotro/minimyth-dev/images/main/usr/lib/qt5/lib/libQt5Network.so /home/piotro/minimyth-dev/images/main/usr/lib/qt5/lib/libQt5Xml.so /home/piotro/minimyth-dev/images/main/usr/lib/qt5/lib/libQt5Sql.so /home/piotro/minimyth-dev/images/main/usr/lib/qt5/lib/libQt5Core.so -lGLESv2 -lstdc++ -lm -lgcc_s -lpthread -lc -lgcc_s /home/piotro/minimyth-dev/images/build/usr/lib/gcc/armv7a-minimyth-linux-gnueabihf/9.3.0/crtendS.o /home/piotro/minimyth-dev/images/main/usr/lib/crtn.o
/home/piotro/minimyth-dev/images/build/usr/libexec/gcc/armv7a-minimyth-linux-gnueabihf/9.3.0/lto-wrapper -fresolution=/tmp/cciIplCW.res -flinker-output=dyn /home/piotro/minimyth-dev/images/main/usr/lib/liblzo2.a@0x93a84 /home/piotro/minimyth-dev/images/main/usr/lib/liblzo2.a@0xdd748
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 /home/piotro/minimyth-dev/images/build/usr/libexec/gcc/armv7a-minimyth-linux-gnueabihf/9.3.0/lto1 -quiet -dumpdir ./ -dumpbase libmythtv-32.so.32.0.0.wpa -mtune=cortex-a7 -mfloat-abi=softfp -mfpu=neon-vfpv4 -mtls-dialect=gnu -mcpu=arm10tdmi -mtls-dialect=gnu -marm -march=armv5t -auxbase liblzo2 -O2 -version -fno-openmp -fno-openacc -fno-pie -fltrans-output-list=/tmp/libmythtv-32.so.32.0.0.OFcQbK.ltrans.out -fwpa -fresolution=/tmp/cciIplCW.res -flinker-output=dyn @/tmp/ccWCGZeL
GNU GIMPLE (GCC) version 9.3.0 (armv7a-minimyth-linux-gnueabihf)
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GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU GIMPLE (GCC) version 9.3.0 (armv7a-minimyth-linux-gnueabihf)
	compiled by GNU C version 9.3.0, GMP version 6.1.2, MPFR version 4.0.1, MPC version 1.1.0, isl version isl-0.18-GMP

GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
COMPILER_PATH=/home/piotro/minimyth-dev/images/build/usr/libexec/gcc/armv7a-minimyth-linux-gnueabihf/9.3.0/:/home/piotro/minimyth-dev/images/build/usr/libexec/gcc/armv7a-minimyth-linux-gnueabihf/9.3.0/:/home/piotro/minimyth-dev/images/build/usr/libexec/gcc/armv7a-minimyth-linux-gnueabihf/:/home/piotro/minimyth-dev/images/build/usr/lib/gcc/armv7a-minimyth-linux-gnueabihf/9.3.0/:/home/piotro/minimyth-dev/images/build/usr/lib/gcc/armv7a-minimyth-linux-gnueabihf/:/home/piotro/minimyth-dev/images/build/usr/lib/gcc/armv7a-minimyth-linux-gnueabihf/9.3.0/../../../../armv7a-minimyth-linux-gnueabihf/bin/:/home/piotro/minimyth-dev/images/build/usr/libexec/gcc/armv7a-minimyth-linux-gnueabihf/9.3.0/:/home/piotro/minimyth-dev/images/build/usr/libexec/gcc/armv7a-minimyth-linux-gnueabihf/9.3.0/:/home/piotro/minimyth-dev/images/build/usr/libexec/gcc/armv7a-minimyth-linux-gnueabihf/:/home/piotro/minimyth-dev/images/build/usr/lib/gcc/armv7a-minimyth-linux-gnueabihf/9.3.0/:/home/piotro/minimyth-dev/images/build/usr/lib/gcc/armv7a-minimyth-linux-gnueabihf/:/home/piotro/minimyth-dev/images/build/usr/lib/gcc/armv7a-minimyth-linux-gnueabihf/9.3.0/../../../../armv7a-minimyth-linux-gnueabihf/bin/
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armv7a-minimyth-linux-gnueabihf-g++ @/tmp/ccxIyl2M
Using built-in specs.
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GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU GIMPLE (GCC) version 9.3.0 (armv7a-minimyth-linux-gnueabihf)
	compiled by GNU C version 9.3.0, GMP version 6.1.2, MPFR version 4.0.1, MPC version 1.1.0, isl version isl-0.18-GMP

GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
In function ‘u2p’:
lto1: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.
lto-wrapper: fatal error: armv7a-minimyth-linux-gnueabihf-g++ returned 1 exit status
compilation terminated.
/home/piotro/minimyth-dev/images/build/usr/lib/gcc/armv7a-minimyth-linux-gnueabihf/9.3.0/../../../../armv7a-minimyth-linux-gnueabihf/bin/ld: error: lto-wrapper failed
collect2: error: ld returned 1 exit status