Bug#929966: g++-8: ICE (SIGILL in collect2) building musescore-snapshot on riscv64

[Thorsten Glaser <tg@mirbsd.de>]

Package: g++-8
Version: 8.3.0-7

https://buildd.debian.org/status/fetch.php?pkg=musescore-snapshot&arch=riscv64&ver=3.1%2Bdfsg1-1&stamp=1559616036&raw=0

Excerpt:

[…]
make[4]: Entering directory '/<<PKGBUILDDIR>>/obj-riscv64-linux-gnu'
[ 86%] Building CXX object mtest/zerberus/inputControls/CMakeFiles/tst_sfzinputcontrols.dir/tst_sfzinputcontrols.cpp.o
cd /<<PKGBUILDDIR>>/obj-riscv64-linux-gnu/mtest/zerberus/inputControls && /usr/bin/c++  -DQT_CONCURRENT_LIB -DQT_CORE_LIB -DQT_GUI_LIB -DQT_HELP_LIB -DQT_NETWORK_LIB -DQT_NO_DEBUG -DQT_OPENGL_LIB -DQT_PRINTSUPPORT_LIB -DQT_QML_LIB -DQT_QUICKWIDGETS_LIB -DQT_QUICK_LIB -DQT_SQL_LIB -DQT_SVG_LIB -DQT_TESTCASE_BUILDDIR=\"/<<PKGBUILDDIR>>/obj-riscv64-linux-gnu\" -DQT_TESTLIB_LIB -DQT_WIDGETS_LIB -DQT_XMLPATTERNS_LIB -DQT_XML_LIB -I/<<PKGBUILDDIR>>/obj-riscv64-linux-gnu/mtest/zerberus/inputControls -I/<<PKGBUILDDIR>>/mtest/zerberus/inputControls -I/<<PKGBUILDDIR>>/obj-riscv64-linux-gnu/mtest/zerberus/inputControls/tst_sfzinputcontrols_autogen/include -I/<<PKGBUILDDIR>>/obj-riscv64-linux-gnu -I/<<PKGBUILDDIR>> -I/usr/include/freetype2 -isystem /usr/include/riscv64-linux-gnu/qt5 -isystem /usr/include/riscv64-linux-gnu/qt5/QtCore -isystem /usr/lib/riscv64-linux-gnu/qt5/mkspecs/linux-g++ -isystem /usr/include/riscv64-linux-gnu/qt5/QtGui -isystem /usr/include/riscv64-linux-gnu/qt5/QtNetwork -isystem /usr/include/riscv64-linux-gnu/qt5/QtTest -isystem /usr/include/riscv64-linux-gnu/qt5/QtQml -isystem /usr/include/riscv64-linux-gnu/qt5/QtQuick -isystem /usr/include/riscv64-linux-gnu/qt5/QtQuickWidgets -isystem /usr/include/riscv64-linux-gnu/qt5/QtWidgets -isystem /usr/include/riscv64-linux-gnu/qt5/QtXml -isystem /usr/include/riscv64-linux-gnu/qt5/QtXmlPatterns -isystem /usr/include/riscv64-linux-gnu/qt5/QtSvg -isystem /usr/include/riscv64-linux-gnu/qt5/QtSql -isystem /usr/include/riscv64-linux-gnu/qt5/QtPrintSupport -isystem /usr/include/riscv64-linux-gnu/qt5/QtConcurrent -isystem /usr/include/riscv64-linux-gnu/qt5/QtOpenGL -isystem /usr/include/riscv64-linux-gnu/qt5/QtHelp  -g -O2 -fdebug-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -Wformat -Werror=format-security  -Wdate-time -D_FORTIFY_SOURCE=2  -DQT_NO_DEBUG -DNDEBUG -DMSCORE_NO_UPDATE_CHECKER -std=gnu++11 -fPIC    -include all.h -D QT_GUI_LIB -D TESTROOT=\"/<<PKGBUILDDIR>>\" -g -Wall -Wextra -fPIC -std=gnu++11 -o CMakeFiles/tst_sfzinputcontrols.dir/tst_sfzinputcontrols.cpp.o -c /<<PKGBUILDDIR>>/mtest/zerberus/inputControls/tst_sfzinputcontrols.cpp
c++: internal compiler error: Illegal instruction signal terminated program collect2
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-8/README.Bugs> for instructions.
make[4]: *** [mtest/zerberus/global/CMakeFiles/tst_sfzglobal.dir/build.make:126: mtest/zerberus/global/tst_sfzglobal] Error 4
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