[clang] [flang] [llvm] Introduce -fexperimental-loop-fuse to clang and flang (PR #142686)

Mon Sep 15 06:36:57 PDT 2025

llvm-ci wrote:

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

Full details are available at: https://lab.llvm.org/buildbot/#/builders/27/builds/16071

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 5 (ninja check 1) failure: stage 1 checked (failure)
...
[121/400] Building CXX object tools/clang/tools/extra/include-cleaner/unittests/CMakeFiles/ClangIncludeCleanerTests.dir/FindHeadersTest.cpp.o
[122/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Lex/PPCallbacksTest.cpp.o
[123/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Parse/ParseHLSLRootSignatureTest.cpp.o
[124/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Driver/ToolChainTest.cpp.o
[125/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/CloneDetectionTest.cpp.o
[126/400] Building CXX object tools/clang/tools/extra/unittests/clang-tidy/CMakeFiles/ClangTidyTests.dir/ReadabilityModuleTest.cpp.o
[127/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/MacroExpansionContextTest.cpp.o
[128/400] Building CXX object tools/clang/tools/extra/unittests/clang-tidy/CMakeFiles/ClangTidyTests.dir/TransformerClangTidyCheckTest.cpp.o
[129/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/StaticAnalyzer/APSIntTypeTest.cpp.o
[130/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/FlowSensitive/MultiVarConstantPropagationTest.cpp.o
FAILED: tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/FlowSensitive/MultiVarConstantPropagationTest.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/Analysis/FlowSensitive/MultiVarConstantPropagationTest.cpp.o -MF tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/FlowSensitive/MultiVarConstantPropagationTest.cpp.o.d -o tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/FlowSensitive/MultiVarConstantPropagationTest.cpp.o -c /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang/unittests/Analysis/FlowSensitive/MultiVarConstantPropagationTest.cpp
c++: fatal error: Killed signal terminated program cc1plus
compilation terminated.
[131/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/StaticAnalyzer/BlockEntranceCallbackTest.cpp.o
[132/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/FlowSensitive/DeterminismTest.cpp.o
[133/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/StaticAnalyzer/CallEventTest.cpp.o
[134/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/FlowSensitive/DebugSupportTest.cpp.o
[135/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/CFGTest.cpp.o
[136/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/FlowSensitive/TransferBranchTest.cpp.o
[137/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/FlowSensitive/CFGMatchSwitchTest.cpp.o
[138/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/CFGDominatorTree.cpp.o
[139/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/FlowSensitive/ChromiumCheckModelTest.cpp.o
[140/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/FlowSensitive/CachedConstAccessorsLatticeTest.cpp.o
[141/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/StaticAnalyzer/ConflictingEvalCallsTest.cpp.o
[142/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/FlowSensitive/DataflowEnvironmentTest.cpp.o
[143/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/FlowSensitive/SimplifyConstraintsTest.cpp.o
[144/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/FlowSensitive/SmartPointerAccessorCachingTest.cpp.o
[145/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/LifetimeSafetyTest.cpp.o
[146/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/StaticAnalyzer/BugReportInterestingnessTest.cpp.o
[147/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/FlowSensitive/LoggerTest.cpp.o
[148/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/FlowSensitive/ASTOpsTest.cpp.o
[149/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/FlowSensitive/WatchedLiteralsSolverTest.cpp.o
[150/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/FlowSensitive/MatchSwitchTest.cpp.o
[151/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/FlowSensitive/TestingSupportTest.cpp.o
[152/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/FlowSensitive/TestingSupport.cpp.o
[153/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/FlowSensitive/RecordOpsTest.cpp.o
[154/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/FlowSensitive/SignAnalysisTest.cpp.o
[155/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/IntervalPartitionTest.cpp.o
[156/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/FlowSensitive/UncheckedOptionalAccessModelTest.cpp.o
[157/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/FlowSensitive/SingleVarConstantPropagationTest.cpp.o
[158/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/StaticAnalyzer/CallDescriptionTest.cpp.o
[159/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/ExprMutationAnalyzerTest.cpp.o
[160/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/FlowSensitive/TypeErasedDataflowAnalysisTest.cpp.o
[161/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/StaticAnalyzer/ExprEngineVisitTest.cpp.o
[162/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/StaticAnalyzer/FalsePositiveRefutationBRVisitorTest.cpp.o
[163/400] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/FlowSensitive/TransferTest.cpp.o
ninja: build stopped: subcommand failed.

```

</details>

https://github.com/llvm/llvm-project/pull/142686