[clang] [llvm] [PowerPC] Diagnose musttail instead of crash inside backend (PR #93267)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-aarch64-sve-vls-2stage` running on `linaro-g3-04` while building `clang` at step 11 "build stage 2".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/4/builds/623

Here is the relevant piece of the build log for the reference:
```
Step 11 (build stage 2) failure: 'ninja' (failure)
...
[7764/8583] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/obj.FIRBuilder.dir/Complex.cpp.o
[7765/8583] Building CXX object tools/flang/lib/Semantics/CMakeFiles/obj.FortranSemantics.dir/resolve-names.cpp.o
[7766/8583] Building CXX object tools/flang/lib/Frontend/CMakeFiles/obj.flangFrontend.dir/TextDiagnosticBuffer.cpp.o
[7767/8583] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/obj.FIRBuilder.dir/Runtime/Allocatable.cpp.o
[7768/8583] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/obj.FIRBuilder.dir/BoxValue.cpp.o
[7769/8583] Building CXX object tools/flang/lib/Frontend/CMakeFiles/obj.flangFrontend.dir/TextDiagnosticPrinter.cpp.o
[7770/8583] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/obj.FIRBuilder.dir/MutableBox.cpp.o
[7771/8583] Building CXX object tools/flang/lib/Semantics/CMakeFiles/obj.FortranSemantics.dir/expression.cpp.o
[7772/8583] Linking CXX static library lib/libFortranEvaluate.a
[7773/8583] Building CXX object tools/flang/lib/Lower/CMakeFiles/obj.FortranLower.dir/OpenMP/Clauses.cpp.o
FAILED: tools/flang/lib/Lower/CMakeFiles/obj.FortranLower.dir/OpenMP/Clauses.cpp.o 
/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage1.install/bin/clang++ -DFLANG_INCLUDE_TESTS=1 -DFLANG_LITTLE_ENDIAN=1 -DGTEST_HAS_RTTI=0 -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage2/tools/flang/lib/Lower -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/llvm/flang/lib/Lower -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/llvm/flang/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage2/tools/flang/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage2/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/llvm/llvm/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/llvm/llvm/../mlir/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage2/tools/mlir/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage2/tools/clang/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/llvm/llvm/../clang/include -mcpu=neoverse-512tvb -msve-vector-bits=256 -mllvm -treat-scalable-fixed-error-as-warning=false -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -Wno-deprecated-copy -Wno-string-conversion -Wno-ctad-maybe-unsupported -Wno-unused-command-line-argument -Wstring-conversion           -Wcovered-switch-default -Wno-nested-anon-types -O3 -DNDEBUG  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -std=c++17 -MD -MT tools/flang/lib/Lower/CMakeFiles/obj.FortranLower.dir/OpenMP/Clauses.cpp.o -MF tools/flang/lib/Lower/CMakeFiles/obj.FortranLower.dir/OpenMP/Clauses.cpp.o.d -o tools/flang/lib/Lower/CMakeFiles/obj.FortranLower.dir/OpenMP/Clauses.cpp.o -c /home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/llvm/flang/lib/Lower/OpenMP/Clauses.cpp
Killed
[7774/8583] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/obj.FIRBuilder.dir/HLFIRTools.cpp.o
[7775/8583] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/obj.FIRBuilder.dir/Character.cpp.o
[7776/8583] Building CXX object tools/flang/lib/Lower/CMakeFiles/obj.FortranLower.dir/IterationSpace.cpp.o
FAILED: tools/flang/lib/Lower/CMakeFiles/obj.FortranLower.dir/IterationSpace.cpp.o 
/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage1.install/bin/clang++ -DFLANG_INCLUDE_TESTS=1 -DFLANG_LITTLE_ENDIAN=1 -DGTEST_HAS_RTTI=0 -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage2/tools/flang/lib/Lower -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/llvm/flang/lib/Lower -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/llvm/flang/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage2/tools/flang/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage2/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/llvm/llvm/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/llvm/llvm/../mlir/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage2/tools/mlir/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage2/tools/clang/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/llvm/llvm/../clang/include -mcpu=neoverse-512tvb -msve-vector-bits=256 -mllvm -treat-scalable-fixed-error-as-warning=false -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -Wno-deprecated-copy -Wno-string-conversion -Wno-ctad-maybe-unsupported -Wno-unused-command-line-argument -Wstring-conversion           -Wcovered-switch-default -Wno-nested-anon-types -O3 -DNDEBUG  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -std=c++17 -MD -MT tools/flang/lib/Lower/CMakeFiles/obj.FortranLower.dir/IterationSpace.cpp.o -MF tools/flang/lib/Lower/CMakeFiles/obj.FortranLower.dir/IterationSpace.cpp.o.d -o tools/flang/lib/Lower/CMakeFiles/obj.FortranLower.dir/IterationSpace.cpp.o -c /home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/llvm/flang/lib/Lower/IterationSpace.cpp
Killed
[7777/8583] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/obj.FIRBuilder.dir/Runtime/Assign.cpp.o
[7778/8583] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/obj.FIRBuilder.dir/Runtime/Command.cpp.o
[7779/8583] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/obj.FIRBuilder.dir/LowLevelIntrinsics.cpp.o
[7780/8583] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/obj.FIRBuilder.dir/Runtime/Character.cpp.o
[7781/8583] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/obj.FIRBuilder.dir/Runtime/Stop.cpp.o
[7782/8583] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/obj.FIRBuilder.dir/DoLoopHelper.cpp.o
[7783/8583] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/obj.FIRBuilder.dir/Runtime/ArrayConstructor.cpp.o
[7784/8583] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/obj.FIRBuilder.dir/Runtime/Derived.cpp.o
[7785/8583] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/obj.FIRBuilder.dir/FIRBuilder.cpp.o
[7786/8583] Building CXX object tools/flang/lib/Lower/CMakeFiles/obj.FortranLower.dir/CallInterface.cpp.o
FAILED: tools/flang/lib/Lower/CMakeFiles/obj.FortranLower.dir/CallInterface.cpp.o 
/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage1.install/bin/clang++ -DFLANG_INCLUDE_TESTS=1 -DFLANG_LITTLE_ENDIAN=1 -DGTEST_HAS_RTTI=0 -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage2/tools/flang/lib/Lower -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/llvm/flang/lib/Lower -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/llvm/flang/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage2/tools/flang/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage2/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/llvm/llvm/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/llvm/llvm/../mlir/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage2/tools/mlir/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage2/tools/clang/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/llvm/llvm/../clang/include -mcpu=neoverse-512tvb -msve-vector-bits=256 -mllvm -treat-scalable-fixed-error-as-warning=false -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -Wno-deprecated-copy -Wno-string-conversion -Wno-ctad-maybe-unsupported -Wno-unused-command-line-argument -Wstring-conversion           -Wcovered-switch-default -Wno-nested-anon-types -O3 -DNDEBUG  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -std=c++17 -MD -MT tools/flang/lib/Lower/CMakeFiles/obj.FortranLower.dir/CallInterface.cpp.o -MF tools/flang/lib/Lower/CMakeFiles/obj.FortranLower.dir/CallInterface.cpp.o.d -o tools/flang/lib/Lower/CMakeFiles/obj.FortranLower.dir/CallInterface.cpp.o -c /home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/llvm/flang/lib/Lower/CallInterface.cpp
Killed
[7787/8583] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/obj.FIRBuilder.dir/Runtime/Numeric.cpp.o
[7788/8583] Building CXX object tools/flang/lib/Optimizer/CodeGen/CMakeFiles/obj.FIRCodeGen.dir/BoxedProcedure.cpp.o
[7789/8583] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/obj.FIRBuilder.dir/Runtime/Exceptions.cpp.o
[7790/8583] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/obj.FIRBuilder.dir/Runtime/Reduction.cpp.o
[7791/8583] Building CXX object tools/flang/lib/Lower/CMakeFiles/obj.FortranLower.dir/PFTBuilder.cpp.o
FAILED: tools/flang/lib/Lower/CMakeFiles/obj.FortranLower.dir/PFTBuilder.cpp.o 
/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage1.install/bin/clang++ -DFLANG_INCLUDE_TESTS=1 -DFLANG_LITTLE_ENDIAN=1 -DGTEST_HAS_RTTI=0 -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage2/tools/flang/lib/Lower -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/llvm/flang/lib/Lower -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/llvm/flang/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage2/tools/flang/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage2/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/llvm/llvm/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/llvm/llvm/../mlir/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage2/tools/mlir/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage2/tools/clang/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/llvm/llvm/../clang/include -mcpu=neoverse-512tvb -msve-vector-bits=256 -mllvm -treat-scalable-fixed-error-as-warning=false -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -Wno-deprecated-copy -Wno-string-conversion -Wno-ctad-maybe-unsupported -Wno-unused-command-line-argument -Wstring-conversion           -Wcovered-switch-default -Wno-nested-anon-types -O3 -DNDEBUG  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -std=c++17 -MD -MT tools/flang/lib/Lower/CMakeFiles/obj.FortranLower.dir/PFTBuilder.cpp.o -MF tools/flang/lib/Lower/CMakeFiles/obj.FortranLower.dir/PFTBuilder.cpp.o.d -o tools/flang/lib/Lower/CMakeFiles/obj.FortranLower.dir/PFTBuilder.cpp.o -c /home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/llvm/flang/lib/Lower/PFTBuilder.cpp
Killed
[7792/8583] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/obj.FIRBuilder.dir/Runtime/Ragged.cpp.o
[7793/8583] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/obj.FIRBuilder.dir/Runtime/TemporaryStack.cpp.o
[7794/8583] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/obj.FIRBuilder.dir/Runtime/Execute.cpp.o
[7795/8583] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/obj.FIRBuilder.dir/Runtime/Main.cpp.o
[7796/8583] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/obj.FIRBuilder.dir/Runtime/Pointer.cpp.o
[7797/8583] Building CXX object tools/flang/lib/Lower/CMakeFiles/obj.FortranLower.dir/OpenMP/ClauseProcessor.cpp.o
FAILED: tools/flang/lib/Lower/CMakeFiles/obj.FortranLower.dir/OpenMP/ClauseProcessor.cpp.o 
/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage1.install/bin/clang++ -DFLANG_INCLUDE_TESTS=1 -DFLANG_LITTLE_ENDIAN=1 -DGTEST_HAS_RTTI=0 -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage2/tools/flang/lib/Lower -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/llvm/flang/lib/Lower -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/llvm/flang/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage2/tools/flang/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage2/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/llvm/llvm/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/llvm/llvm/../mlir/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage2/tools/mlir/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage2/tools/clang/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/llvm/llvm/../clang/include -mcpu=neoverse-512tvb -msve-vector-bits=256 -mllvm -treat-scalable-fixed-error-as-warning=false -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -Wno-deprecated-copy -Wno-string-conversion -Wno-ctad-maybe-unsupported -Wno-unused-command-line-argument -Wstring-conversion           -Wcovered-switch-default -Wno-nested-anon-types -O3 -DNDEBUG  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -std=c++17 -MD -MT tools/flang/lib/Lower/CMakeFiles/obj.FortranLower.dir/OpenMP/ClauseProcessor.cpp.o -MF tools/flang/lib/Lower/CMakeFiles/obj.FortranLower.dir/OpenMP/ClauseProcessor.cpp.o.d -o tools/flang/lib/Lower/CMakeFiles/obj.FortranLower.dir/OpenMP/ClauseProcessor.cpp.o -c /home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/llvm/flang/lib/Lower/OpenMP/ClauseProcessor.cpp
Killed

```

https://github.com/llvm/llvm-project/pull/93267