[llvm] [MC][TableGen] Make MCRegisterClasses relocation-free (PR #206753)

LLVM Continuous Integration via llvm-commits llvm-commits at lists.llvm.org
Tue Jun 30 22:50:44 PDT 2026 

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-m68k-linux-cross` running on `suse-gary-m68k-cross` while building `bolt,llvm` at step 4 "build stage 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/27/builds/1045

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

```
Step 4 (build stage 1) failure: 'ninja' (failure)
...
[311/706] Building CXX object lib/Target/M68k/CMakeFiles/LLVMM68kCodeGen.dir/M68kMCInstLower.cpp.o
[312/706] Building CXX object lib/Target/M68k/CMakeFiles/LLVMM68kCodeGen.dir/M68kInstrInfo.cpp.o
[313/706] Building CXX object lib/Target/M68k/CMakeFiles/LLVMM68kCodeGen.dir/M68kFrameLowering.cpp.o
[314/706] Building CXX object lib/Target/M68k/CMakeFiles/LLVMM68kCodeGen.dir/M68kTargetObjectFile.cpp.o
[315/706] Building CXX object lib/CodeGen/SelectionDAG/CMakeFiles/LLVMSelectionDAG.dir/SelectionDAGISel.cpp.o
[316/706] Building CXX object lib/Target/M68k/CMakeFiles/LLVMM68kCodeGen.dir/M68kTargetMachine.cpp.o
[317/706] Building CXX object tools/llvm-exegesis/lib/CMakeFiles/LLVMExegesis.dir/MCInstrDescView.cpp.o
[318/706] Building CXX object tools/llvm-exegesis/lib/CMakeFiles/LLVMExegesis.dir/DisassemblerHelper.cpp.o
[319/706] Building CXX object lib/CodeGen/AsmPrinter/CMakeFiles/LLVMAsmPrinter.dir/DwarfCompileUnit.cpp.o
[320/706] Building CXX object lib/Target/M68k/AsmParser/CMakeFiles/LLVMM68kAsmParser.dir/M68kAsmParser.cpp.o
FAILED: lib/Target/M68k/AsmParser/CMakeFiles/LLVMM68kAsmParser.dir/M68kAsmParser.cpp.o 
/usr/bin/c++ -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GLIBCXX_USE_CXX11_ABI=1 -D_GNU_SOURCE -D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_EXTENSIVE -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/lib/Target/M68k/AsmParser -I/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/lib/Target/M68k/AsmParser -I/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/lib/Target/M68k -I/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/lib/Target/M68k -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 -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-maybe-uninitialized -Wno-nonnull -Wno-class-memaccess -Wno-dangling-reference -Wno-redundant-move -Wno-pessimizing-move -Wno-array-bounds -Wno-stringop-overread -Wno-dangling-pointer -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wno-misleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG -std=c++17 -fvisibility=hidden -UNDEBUG -fno-exceptions -funwind-tables -fno-rtti -MD -MT lib/Target/M68k/AsmParser/CMakeFiles/LLVMM68kAsmParser.dir/M68kAsmParser.cpp.o -MF lib/Target/M68k/AsmParser/CMakeFiles/LLVMM68kAsmParser.dir/M68kAsmParser.cpp.o.d -o lib/Target/M68k/AsmParser/CMakeFiles/LLVMM68kAsmParser.dir/M68kAsmParser.cpp.o -c /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/lib/Target/M68k/AsmParser/M68kAsmParser.cpp
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/lib/Target/M68k/AsmParser/M68kAsmParser.cpp: In member function ‘bool {anonymous}::M68kOperand::isPCIBD32() const’:
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/lib/Target/M68k/AsmParser/M68kAsmParser.cpp:516:11: error: ‘M68kMCRegisterClasses’ was not declared in this scope
  516 |           M68kMCRegisterClasses[M68k::XR32RegClassID].contains(MemOp.InnerReg));
      |           ^~~~~~~~~~~~~~~~~~~~~
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/lib/Target/M68k/AsmParser/M68kAsmParser.cpp: In member function ‘bool {anonymous}::M68kOperand::isPCIBD16() const’:
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/lib/Target/M68k/AsmParser/M68kAsmParser.cpp:520:10: error: ‘M68kMCRegisterClasses’ was not declared in this scope
  520 |          M68kMCRegisterClasses[M68k::XR16RegClassID].contains(MemOp.InnerReg);
      |          ^~~~~~~~~~~~~~~~~~~~~
[321/706] Building CXX object lib/Target/M68k/CMakeFiles/LLVMM68kCodeGen.dir/M68kSubtarget.cpp.o
[322/706] Building CXX object tools/llvm-exegesis/lib/CMakeFiles/LLVMExegesis.dir/ResultAggregator.cpp.o
[323/706] Building CXX object lib/Target/X86/MCTargetDesc/CMakeFiles/LLVMX86Desc.dir/X86ATTInstPrinter.cpp.o
[324/706] Building CXX object lib/Target/X86/MCTargetDesc/CMakeFiles/LLVMX86Desc.dir/X86InstPrinterCommon.cpp.o
[325/706] Building CXX object lib/Target/X86/MCTargetDesc/CMakeFiles/LLVMX86Desc.dir/X86IntelInstPrinter.cpp.o
[326/706] Building CXX object tools/llvm-exegesis/lib/CMakeFiles/LLVMExegesis.dir/Analysis.cpp.o
[327/706] Building CXX object lib/Target/X86/MCTargetDesc/CMakeFiles/LLVMX86Desc.dir/X86InstComments.cpp.o
[328/706] Building CXX object lib/Target/M68k/CMakeFiles/LLVMM68kCodeGen.dir/GISel/M68kInstructionSelector.cpp.o
[329/706] Building CXX object lib/Target/X86/MCTargetDesc/CMakeFiles/LLVMX86Desc.dir/X86EncodingOptimization.cpp.o
[330/706] Building CXX object lib/Target/X86/MCTargetDesc/CMakeFiles/LLVMX86Desc.dir/X86WinCOFFStreamer.cpp.o
[331/706] Building CXX object lib/Target/X86/MCTargetDesc/CMakeFiles/LLVMX86Desc.dir/X86WinCOFFObjectWriter.cpp.o
[332/706] Building CXX object lib/Target/X86/MCTargetDesc/CMakeFiles/LLVMX86Desc.dir/X86ELFObjectWriter.cpp.o
[333/706] Building CXX object tools/llvm-exegesis/lib/CMakeFiles/LLVMExegesis.dir/SchedClassResolution.cpp.o
[334/706] Building CXX object tools/llvm-exegesis/lib/CMakeFiles/LLVMExegesis.dir/Clustering.cpp.o
[335/706] Building CXX object lib/Target/X86/MCTargetDesc/CMakeFiles/LLVMX86Desc.dir/X86MachObjectWriter.cpp.o
[336/706] Building CXX object lib/CodeGen/GlobalISel/CMakeFiles/LLVMGlobalISel.dir/IRTranslator.cpp.o
[337/706] Building CXX object lib/Target/X86/MCTargetDesc/CMakeFiles/LLVMX86Desc.dir/X86MnemonicTables.cpp.o
[338/706] Building CXX object lib/Target/X86/MCTargetDesc/CMakeFiles/LLVMX86Desc.dir/X86WinCOFFTargetStreamer.cpp.o
[339/706] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/LiveDebugValues/InstrRefBasedImpl.cpp.o
[340/706] Building CXX object lib/Target/M68k/CMakeFiles/LLVMM68kCodeGen.dir/M68kISelLowering.cpp.o
[341/706] Building CXX object lib/CodeGen/GlobalISel/CMakeFiles/LLVMGlobalISel.dir/LegalizerHelper.cpp.o
[342/706] Building CXX object lib/Target/X86/MCTargetDesc/CMakeFiles/LLVMX86Desc.dir/X86AsmBackend.cpp.o
[343/706] Building CXX object lib/Target/X86/MCTargetDesc/CMakeFiles/LLVMX86Desc.dir/X86MCCodeEmitter.cpp.o
[344/706] Building CXX object lib/Target/M68k/Disassembler/CMakeFiles/LLVMM68kDisassembler.dir/M68kDisassembler.cpp.o
[345/706] Building CXX object tools/llvm-exegesis/lib/CMakeFiles/LLVMExegesis.dir/LatencyBenchmarkRunner.cpp.o
In file included from /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/include/llvm/Support/ErrorHandling.h:17,
                 from /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/include/llvm/ADT/Hashing.h:49,
                 from /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/include/llvm/ADT/ArrayRef.h:12,
                 from /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/include/llvm/ADT/BitVector.h:17,

```

</details>

https://github.com/llvm/llvm-project/pull/206753

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