[CAS] Default to only build OnDiskCAS on 64 bit machine

[cachemeifyoucan]

To workaroud the buildbot failure on clang-armv8-quick, which builds
with triple: armv8l-unknown-linux-gnueabihf.

[cachemeifyoucan]

@DavidSpickett Is there anyway to reproduce https://lab.llvm.org/buildbot/#/builders/154/builds/21514 to see what actually crashed? The back trace in the log is not specific enough to know what crashed.

[llvm-ci]

LLVM Buildbot has detected a new failure on builder clang-m68k-linux-cross running on suse-gary-m68k-cross while building llvm at step 5 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/27/builds/16089

Here is the relevant piece of the build log for the reference

Step 5 (ninja check 1) failure: stage 1 checked (failure)
...
[311/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RecursiveASTVisitorTests/LambdaDefaultCapture.cpp.o
[312/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RecursiveASTVisitorTests/BitfieldInitializer.cpp.o
[313/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RecursiveASTVisitorTests/CXXMemberCall.cpp.o
[314/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RecursiveASTVisitorTests/ConstructExpr.cpp.o
[315/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RecursiveASTVisitorTests/LambdaExpr.cpp.o
[316/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RecursiveASTVisitorTests/LambdaTemplateParams.cpp.o
[317/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RewriterTest.cpp.o
[318/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RecursiveASTVisitorTests/MemberPointerTypeLoc.cpp.o
[319/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/DependencyScanning/DependencyScannerTest.cpp.o
[320/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/AST/ASTImporterTest.cpp.o
FAILED: tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/AST/ASTImporterTest.cpp.o 
/usr/bin/c++ -DGTEST_HAS_RTTI=0 -DLLVM_BUILD_STATIC -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GLIBCXX_USE_CXX11_ABI=1 -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/tools/clang/unittests -I/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang/unittests -I/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang/include -I/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/tools/clang/include -I/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/include -I/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/include -I/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang/unittests/Tooling -I/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/third-party/unittest/googletest/include -I/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/third-party/unittest/googlemock/include -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wno-uninitialized -Wno-nonnull -Wno-class-memaccess -Wno-dangling-reference -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wno-misleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -fno-common -Woverloaded-virtual -O3 -DNDEBUG -std=c++17  -Wno-variadic-macros -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -Wno-suggest-override -MD -MT tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/AST/ASTImporterTest.cpp.o -MF tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/AST/ASTImporterTest.cpp.o.d -o tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/AST/ASTImporterTest.cpp.o -c /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang/unittests/AST/ASTImporterTest.cpp
c++: fatal error: Killed signal terminated program cc1plus
compilation terminated.
[321/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RecursiveASTVisitorTests/ParenExpr.cpp.o
[322/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RecursiveASTVisitorTests/NestedNameSpecifiers.cpp.o
[323/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RecursiveASTVisitorTestDeclVisitor.cpp.o
[324/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/ReplacementsYamlTest.cpp.o
[325/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/ASTMatchers/ASTMatchersNodeTest.cpp.o
[326/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RecursiveASTVisitorTests/InitListExprPostOrder.cpp.o
[327/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RecursiveASTVisitorTests/Attr.cpp.o
[328/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RecursiveASTVisitorTests/TraversalScope.cpp.o
[329/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RecursiveASTVisitorTests/TemplateArgumentLocTraverser.cpp.o
[330/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/Syntax/TreeTestBase.cpp.o
[331/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RangeSelectorTest.cpp.o
[332/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RecursiveASTVisitorTests/InitListExprPostOrderNoQueue.cpp.o
[333/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/Syntax/MutationsTest.cpp.o
[334/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RecursiveASTVisitorTestTypeLocVisitor.cpp.o
[335/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RefactoringActionRulesTest.cpp.o
[336/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/ToolingTest.cpp.o
[337/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/Syntax/SynthesisTest.cpp.o
[338/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RefactoringCallbacksTest.cpp.o
[339/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/Syntax/TreeTest.cpp.o
[340/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RefactoringTest.cpp.o
[341/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/Syntax/BuildTreeTest.cpp.o
[342/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/SourceCodeBuildersTest.cpp.o
[343/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/ASTMatchers/ASTMatchersNarrowingTest.cpp.o
[344/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RecursiveASTVisitorTests/CallbacksLeaf.cpp.o
[345/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/StencilTest.cpp.o
[346/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/SourceCodeTest.cpp.o
[347/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RecursiveASTVisitorTests/CallbacksCallExpr.cpp.o
[348/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RecursiveASTVisitorTestPostOrderVisitor.cpp.o
[349/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RecursiveASTVisitorTests/CallbacksCompoundAssignOperator.cpp.o
[350/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RecursiveASTVisitorTests/CallbacksUnaryOperator.cpp.o
[351/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RecursiveASTVisitorTests/CallbacksBinaryOperator.cpp.o
[352/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/TransformerTest.cpp.o
[353/1188] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/ASTMatchers/ASTMatchersTraversalTest.cpp.o
ninja: build stopped: subcommand failed.

[llvm-ci]

LLVM Buildbot has detected a new failure on builder clang-ppc64le-linux-multistage running on ppc64le-clang-multistage-test while building llvm at step 5 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/76/builds/12885

Here is the relevant piece of the build log for the reference

Step 5 (ninja check 1) failure: 1200 seconds without output running [b'ninja', b'check-all', b'check-runtimes'], attempting to kill
...
[79/85] Generating POWERPC64LELinuxConfig/Asan-powerpc64le-calls-Noinst-Test
[80/85] Generating ASAN_INST_TEST_OBJECTS.gtest-all.cc.powerpc64le-calls.o
[81/85] Generating POWERPC64LELinuxDynamicConfig/Asan-powerpc64le-calls-Dynamic-Test
[82/85] Generating POWERPC64LELinuxConfig/Asan-powerpc64le-calls-Test
[83/85] Generating ASAN_INST_TEST_OBJECTS.gtest-all.cc.powerpc64le-inline.o
[84/85] Generating POWERPC64LELinuxDynamicConfig/Asan-powerpc64le-inline-Dynamic-Test
[85/85] Generating POWERPC64LELinuxConfig/Asan-powerpc64le-inline-Test
[1035/1257] No install step for 'runtimes'
[1036/1257] cd /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-multistage-test/clang-ppc64le-multistage/stage1/runtimes/runtimes-bins && /home/buildbots/llvm-external-buildbots/cmake-3.31.2/bin/cmake --build /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-multistage-test/clang-ppc64le-multistage/stage1/runtimes/runtimes-bins/ --target check-runtimes --config Release
[0/1] Running runtimes regression tests
command timed out: 1200 seconds without output running [b'ninja', b'check-all', b'check-runtimes'], attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=1474.768851