[clang] [llvm] [HLSL][RootSignature] Define and integrate rootsig clang attr and decl (PR #137690)

Mon May 12 10:45:49 PDT 2025

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `ppc64le-lld-multistage-test` running on `ppc64le-lld-multistage-test` while building `clang,llvm` at step 12 "build-stage2-unified-tree".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/168/builds/11994

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

```
Step 12 (build-stage2-unified-tree) failure: build (failure)
...
262.529 [1031/550/4974] Building AMDGPUGenMCPseudoLowering.inc...
262.551 [1031/549/4975] Building CXX object tools/clang/lib/StaticAnalyzer/Checkers/CMakeFiles/obj.clangStaticAnalyzerCheckers.dir/LocalizationChecker.cpp.o
262.553 [1031/548/4976] Building CXX object lib/Target/X86/CMakeFiles/LLVMX86CodeGen.dir/X86FixupLEAs.cpp.o
262.575 [1031/547/4977] Building CXX object unittests/tools/llvm-mca/CMakeFiles/LLVMMCATests.dir/MCATestBase.cpp.o
262.607 [1031/546/4978] Building CXX object unittests/ExecutionEngine/Orc/CMakeFiles/OrcJITTests.dir/ExecutorAddressTest.cpp.o
262.610 [1031/545/4979] Building CXX object lib/Target/ARM/CMakeFiles/LLVMARMCodeGen.dir/ARMFrameLowering.cpp.o
262.619 [1031/544/4980] Building CXX object lib/Target/BPF/CMakeFiles/LLVMBPFCodeGen.dir/BPFAbstractMemberAccess.cpp.o
262.636 [1031/543/4981] Building CXX object lib/Target/X86/CMakeFiles/LLVMX86CodeGen.dir/X86SpeculativeExecutionSideEffectSuppression.cpp.o
262.640 [1031/542/4982] Building CXX object lib/Target/X86/CMakeFiles/LLVMX86CodeGen.dir/X86SuppressAPXForReloc.cpp.o
262.661 [1031/541/4983] Building CXX object tools/clang/lib/Sema/CMakeFiles/obj.clangSema.dir/SemaHLSL.cpp.o
FAILED: tools/clang/lib/Sema/CMakeFiles/obj.clangSema.dir/SemaHLSL.cpp.o 
ccache /home/buildbots/llvm-external-buildbots/workers/ppc64le-lld-multistage-test/ppc64le-lld-multistage-test/install/stage1/bin/clang++ -DCLANG_EXPORTS -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/buildbots/llvm-external-buildbots/workers/ppc64le-lld-multistage-test/ppc64le-lld-multistage-test/build/stage2/tools/clang/lib/Sema -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-lld-multistage-test/ppc64le-lld-multistage-test/llvm-project/clang/lib/Sema -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-lld-multistage-test/ppc64le-lld-multistage-test/llvm-project/clang/include -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-lld-multistage-test/ppc64le-lld-multistage-test/build/stage2/tools/clang/include -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-lld-multistage-test/ppc64le-lld-multistage-test/build/stage2/include -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-lld-multistage-test/ppc64le-lld-multistage-test/llvm-project/llvm/include -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror -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 -Wno-unnecessary-virtual-specifier -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -fno-common -Woverloaded-virtual -Wno-nested-anon-types -O3 -DNDEBUG -std=c++17  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -MD -MT tools/clang/lib/Sema/CMakeFiles/obj.clangSema.dir/SemaHLSL.cpp.o -MF tools/clang/lib/Sema/CMakeFiles/obj.clangSema.dir/SemaHLSL.cpp.o.d -o tools/clang/lib/Sema/CMakeFiles/obj.clangSema.dir/SemaHLSL.cpp.o -c /home/buildbots/llvm-external-buildbots/workers/ppc64le-lld-multistage-test/ppc64le-lld-multistage-test/llvm-project/clang/lib/Sema/SemaHLSL.cpp
/home/buildbots/llvm-external-buildbots/workers/ppc64le-lld-multistage-test/ppc64le-lld-multistage-test/llvm-project/clang/lib/Sema/SemaHLSL.cpp:973:15: error: variable 'SignatureDecl' set but not used [-Werror,-Wunused-but-set-variable]
  973 |     if (auto *SignatureDecl =
      |               ^
1 error generated.
262.724 [1031/540/4984] Building CXX object lib/Target/RISCV/CMakeFiles/LLVMRISCVCodeGen.dir/RISCVConstantPoolValue.cpp.o
262.750 [1031/539/4985] Building CXX object lib/Target/SystemZ/CMakeFiles/LLVMSystemZCodeGen.dir/SystemZFrameLowering.cpp.o
262.778 [1031/538/4986] Building CXX object lib/Target/AArch64/CMakeFiles/LLVMAArch64CodeGen.dir/AArch64AdvSIMDScalarPass.cpp.o
262.816 [1031/537/4987] Building CXX object lib/Target/SystemZ/CMakeFiles/LLVMSystemZCodeGen.dir/SystemZElimCompare.cpp.o
262.835 [1031/536/4988] Building CXX object lib/Target/AArch64/CMakeFiles/LLVMAArch64CodeGen.dir/SVEIntrinsicOpts.cpp.o
262.838 [1031/535/4989] Building CXX object tools/clang/lib/Sema/CMakeFiles/obj.clangSema.dir/CodeCompleteConsumer.cpp.o
262.869 [1031/534/4990] Building CXX object tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/TargetBuiltins/PPC.cpp.o
262.893 [1031/533/4991] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/Driver.cpp.o
262.915 [1031/532/4992] Building CXX object unittests/ExecutionEngine/MCJIT/CMakeFiles/MCJITTests.dir/MCJITTest.cpp.o
262.932 [1031/531/4993] Building CXX object tools/clang/lib/AST/CMakeFiles/obj.clangAST.dir/Decl.cpp.o
262.936 [1031/530/4994] Building CXX object unittests/ExecutionEngine/Orc/CMakeFiles/OrcJITTests.dir/OrcTestCommon.cpp.o
262.970 [1031/529/4995] Building CXX object lib/Target/X86/CMakeFiles/LLVMX86CodeGen.dir/X86FastPreTileConfig.cpp.o
263.070 [1031/528/4996] Building CXX object unittests/ExecutionEngine/MCJIT/CMakeFiles/MCJITTests.dir/MCJITMultipleModuleTest.cpp.o
263.094 [1031/527/4997] Building CXX object unittests/Target/AArch64/CMakeFiles/AArch64Tests.dir/DecomposeStackOffsetTest.cpp.o
263.110 [1031/526/4998] Building CXX object unittests/ExecutionEngine/Orc/CMakeFiles/OrcJITTests.dir/ExecutionSessionWrapperFunctionCallsTest.cpp.o
263.112 [1031/525/4999] Building CXX object lib/Target/SystemZ/CMakeFiles/LLVMSystemZCodeGen.dir/SystemZInstrInfo.cpp.o
263.133 [1031/524/5000] Building CXX object tools/clang/lib/StaticAnalyzer/Checkers/CMakeFiles/obj.clangStaticAnalyzerCheckers.dir/RunLoopAutoreleaseLeakChecker.cpp.o
263.154 [1031/523/5001] Building CXX object tools/clang/lib/Sema/CMakeFiles/obj.clangSema.dir/SemaCXXScopeSpec.cpp.o
263.160 [1031/522/5002] Building CXX object tools/clang/lib/AST/CMakeFiles/obj.clangAST.dir/Stmt.cpp.o
263.189 [1031/521/5003] Building CXX object lib/Target/XCore/CMakeFiles/LLVMXCoreCodeGen.dir/XCoreISelDAGToDAG.cpp.o
263.192 [1031/520/5004] Building CXX object lib/Target/X86/CMakeFiles/LLVMX86CodeGen.dir/X86IndirectThunks.cpp.o
263.217 [1031/519/5005] Building CXX object lib/Target/AArch64/CMakeFiles/LLVMAArch64CodeGen.dir/GISel/AArch64RegisterBankInfo.cpp.o
263.300 [1031/518/5006] Building CXX object lib/Target/X86/CMakeFiles/LLVMX86CodeGen.dir/X86TileConfig.cpp.o
263.302 [1031/517/5007] Building CXX object lib/Target/X86/CMakeFiles/LLVMX86CodeGen.dir/X86PreTileConfig.cpp.o
263.306 [1031/516/5008] Building CXX object lib/Target/Hexagon/CMakeFiles/LLVMHexagonCodeGen.dir/HexagonTargetMachine.cpp.o
263.392 [1031/515/5009] Building CXX object lib/Target/ARM/CMakeFiles/LLVMARMCodeGen.dir/ARMFastISel.cpp.o
263.420 [1031/514/5010] Building CXX object tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGPointerAuth.cpp.o
263.422 [1031/513/5011] Building CXX object tools/clang/unittests/Format/CMakeFiles/FormatTests.dir/FormatTokenSourceTest.cpp.o
263.440 [1031/512/5012] Building AMDGPUGenDisassemblerTables.inc...
263.462 [1031/511/5013] Building CXX object tools/clang/unittests/Basic/CMakeFiles/BasicTests.dir/FileManagerTest.cpp.o
263.501 [1031/510/5014] Building CXX object tools/clang/lib/CodeGen/CMakeFiles/obj.clangCodeGen.dir/CGCoroutine.cpp.o
263.525 [1031/509/5015] Building CXX object lib/Target/XCore/CMakeFiles/LLVMXCoreCodeGen.dir/XCoreRegisterInfo.cpp.o
263.537 [1031/508/5016] Building CXX object lib/Target/X86/CMakeFiles/LLVMX86CodeGen.dir/X86FlagsCopyLowering.cpp.o

```

</details>

https://github.com/llvm/llvm-project/pull/137690