cmake crashes on qemu-alpha-user with Illegal Instruction

This bug has been copied automatically from: https://bugs.launchpad.net/qemu/+bug/1860553
Reported by 'John Paul Adrian Glaubitz' on 2020-01-22 :

I tried building cmake on Debian unstable for Alpha today using qemu-user
and the compiled cmake binary crashed with "Illegal Instruction":

g++ -Wl,-z,relro -Wl,--as-needed -g -O2 -fdebug-prefix-
map=/<<PKGBUILDDIR>>=. -Wformat -Werror=format-security -Wdate-time
-D_FORTIFY_SOURCE=2             -I/<<PKGBUILDDIR>>/Build/Bootstrap.cmk
-I/<<PKGBUILDDIR>>/Source   -I/<<PKGBUILDDIR>>/Source/LexerParser
-I/<<PKGBUILDDIR>>/Utilities  cmAddCustomCommandCommand.o
cmAddCustomTargetCommand.o cmAddDefinitionsCommand.o
cmAddDependenciesCommand.o cmAddExecutableCommand.o cmAddLibraryCommand.o
cmAddSubDirectoryCommand.o cmAddTestCommand.o cmArgumentParser.o
cmBreakCommand.o cmBuildCommand.o cmCMakeMinimumRequired.o
cmCMakePolicyCommand.o cmCPackPropertiesGenerator.o cmCacheManager.o
cmCommand.o cmCommandArgumentParserHelper.o cmCommands.o
cmCommonTargetGenerator.o cmComputeComponentGraph.o cmComputeLinkDepends.o
cmComputeLinkInformation.o cmComputeTargetDepends.o cmConditionEvaluator.o
cmConfigureFileCommand.o cmContinueCommand.o cmCoreTryCompile.o
cmCreateTestSourceList.o cmCustomCommand.o cmCustomCommandGenerator.o
cmDefinePropertyCommand.o cmDefinitions.o cmDepends.o cmDependsC.o
cmDisallowedCommand.o cmDocumentationFormatter.o cmEnableLanguageCommand.o
cmEnableTestingCommand.o cmExecProgramCommand.o cmExecuteProcessCommand.o
cmExpandedCommandArgument.o cmExportBuildFileGenerator.o
cmExportFileGenerator.o cmExportInstallFileGenerator.o cmExportSet.o
cmExportSetMap.o cmExportTryCompileFileGenerator.o cmExprParserHelper.o
cmExternalMakefileProjectGenerator.o cmFileCommand.o cmFileCopier.o
cmFileInstaller.o cmFileTime.o cmFileTimeCache.o cmFileTimes.o
cmFindBase.o cmFindCommon.o cmFindFileCommand.o cmFindLibraryCommand.o
cmFindPackageCommand.o cmFindPathCommand.o cmFindProgramCommand.o
cmForEachCommand.o cmFunctionCommand.o cmFSPermissions.o
cmGeneratedFileStream.o cmGeneratorExpression.o
cmGeneratorExpressionContext.o cmGeneratorExpressionDAGChecker.o
cmGeneratorExpressionEvaluationFile.o cmGeneratorExpressionEvaluator.o
cmGeneratorExpressionLexer.o cmGeneratorExpressionNode.o
cmGeneratorExpressionParser.o cmGeneratorTarget.o
cmGetCMakePropertyCommand.o cmGetDirectoryPropertyCommand.o
cmGetFilenameComponentCommand.o cmGetPipes.o cmGetPropertyCommand.o
cmGetSourceFilePropertyCommand.o cmGetTargetPropertyCommand.o
cmGetTestPropertyCommand.o cmGlobalCommonGenerator.o cmGlobalGenerator.o
cmGlobalUnixMakefileGenerator3.o cmGlobVerificationManager.o
cmHexFileConverter.o cmIfCommand.o cmIncludeCommand.o
cmIncludeGuardCommand.o cmIncludeDirectoryCommand.o
cmIncludeRegularExpressionCommand.o cmInstallCommand.o
cmInstallCommandArguments.o cmInstallDirectoryGenerator.o
cmInstallExportGenerator.o cmInstallFilesCommand.o
cmInstallFilesGenerator.o cmInstallGenerator.o cmInstallScriptGenerator.o
cmInstallSubdirectoryGenerator.o cmInstallTargetGenerator.o
cmInstallTargetsCommand.o cmInstalledFile.o cmLinkDirectoriesCommand.o
cmLinkItem.o cmLinkLineComputer.o cmLinkLineDeviceComputer.o
cmListCommand.o cmListFileCache.o cmLocalCommonGenerator.o
cmLocalGenerator.o cmLocalUnixMakefileGenerator3.o
cmMSVC60LinkLineComputer.o cmMacroCommand.o cmMakeDirectoryCommand.o
cmMakefile.o cmMakefileExecutableTargetGenerator.o
cmMakefileLibraryTargetGenerator.o cmMakefileTargetGenerator.o
cmMakefileUtilityTargetGenerator.o cmMarkAsAdvancedCommand.o
cmMathCommand.o cmMessageCommand.o cmMessenger.o cmNewLineStyle.o
cmOSXBundleGenerator.o cmOptionCommand.o cmOrderDirectories.o
cmOutputConverter.o cmParseArgumentsCommand.o cmPathLabel.o cmPolicies.o
cmProcessOutput.o cmProjectCommand.o cmProperty.o cmPropertyDefinition.o
cmPropertyDefinitionMap.o cmPropertyMap.o cmReturnCommand.o
cmRulePlaceholderExpander.o cmScriptGenerator.o cmSearchPath.o
cmSeparateArgumentsCommand.o cmSetCommand.o
cmSetDirectoryPropertiesCommand.o cmSetPropertyCommand.o
cmSetSourceFilesPropertiesCommand.o cmSetTargetPropertiesCommand.o
cmSetTestsPropertiesCommand.o cmSiteNameCommand.o cmSourceFile.o
cmSourceFileLocation.o cmState.o cmStateDirectory.o cmStateSnapshot.o
cmStringReplaceHelper.o cmStringCommand.o cmSubdirCommand.o
cmSystemTools.o cmTarget.o cmTargetCompileDefinitionsCommand.o
cmTargetCompileFeaturesCommand.o cmTargetCompileOptionsCommand.o
cmTargetIncludeDirectoriesCommand.o cmTargetLinkLibrariesCommand.o
cmTargetPropCommandBase.o cmTargetPropertyComputer.o
cmTargetSourcesCommand.o cmTest.o cmTestGenerator.o cmTimestamp.o
cmTryCompileCommand.o cmTryRunCommand.o cmUnexpectedCommand.o
cmUnsetCommand.o cmUVHandlePtr.o cmUVProcessChain.o cmVersion.o
cmWhileCommand.o cmWorkingDirectory.o cmake.o cmakemain.o cmcmd.o
cm_string_view.o cmCommandArgumentLexer.o cmCommandArgumentParser.o
cmExprLexer.o cmExprParser.o cmListFileLexer.o Directory.o EncodingCXX.o
FStream.o Glob.o RegularExpression.o SystemTools.o EncodingC.o
ProcessUNIX.o String.o System.o Terminal.o uv-src-strscpy.c.o uv-src-
timer.c.o uv-src-uv-common.c.o uv-src-unix-cmake-bootstrap.c.o uv-src-
unix-core.c.o uv-src-unix-fs.c.o uv-src-unix-loop.c.o uv-src-unix-loop-
watcher.c.o uv-src-unix-no-fsevents.c.o uv-src-unix-pipe.c.o uv-src-unix-
poll.c.o uv-src-unix-posix-hrtime.c.o uv-src-unix-posix-poll.c.o uv-src-
unix-process.c.o uv-src-unix-signal.c.o uv-src-unix-stream.c.o  -ldl -lrt
-o cmake
make[2]: Leaving directory '/<<PKGBUILDDIR>>/Build/Bootstrap.cmk'
loading initial cache file
/<<PKGBUILDDIR>>/Build/Bootstrap.cmk/InitialCacheFlags.cmake
Illegal instruction
---------------------------------------------
Error when bootstrapping CMake:
Problem while running initial CMake
---------------------------------------------

I'm working on creating a chroot for download to reproduce the issue.