MLIR linking warnings concerning weak symbols

[dpotop]

Hello,

I'm building a dialect for MLIR, and one main difficulty was to isolate my
sources from those of the official LLVM/MLIR project (which I try to maintain
full compatibility with).

Now I manage to compile and execute my code, but I have some nasty linking
warnings I don't know how to make disappear properly.

Here is the link command and the first warning (subsequent ones are quite similar).
I insist on the fact that the code is (currently) working. But then again, It does not do
much - just check the correctness of the input. Sorry for the huge command - I found no simple way of determining which of the .a library files I really need.

clang++ -std=c++14 -L /Users/llvm-test/llvm-dpotop/lib -o main main.o -lExampleIRTransforms -lLLVMAggressiveInstCombine -lLLVMAnalysis -lLLVMAsmParser -lLLVMAsmPrinter -lLLVMBinaryFormat -lLLVMBitReader -lLLVMBitWriter -lLLVMBitstreamReader -lLLVMCFGuard -lLLVMCodeGen -lLLVMCore -lLLVMCoroutines -lLLVMCoverage -lLLVMDWARFLinker -lLLVMDebugInfoCodeView -lLLVMDebugInfoDWARF -lLLVMDebugInfoGSYM -lLLVMDebugInfoMSF -lLLVMDebugInfoPDB -lLLVMDemangle -lLLVMDlltoolDriver -lLLVMExecutionEngine -lLLVMFrontendOpenMP -lLLVMFuzzMutate -lLLVMGlobalISel -lLLVMIRReader -lLLVMInstCombine -lLLVMInstrumentation -lLLVMInterpreter -lLLVMJITLink -lLLVMLTO -lLLVMLibDriver -lLLVMLineEditor -lLLVMLinker -lLLVMMC -lLLVMMCA -lLLVMMCDisassembler -lLLVMMCJIT -lLLVMMCParser -lLLVMMIRParser -lLLVMMLIRTableGen -lLLVMObjCARCOpts -lLLVMObject -lLLVMObjectYAML -lLLVMOption -lLLVMOrcError -lLLVMOrcJIT -lLLVMPasses -lLLVMProfileData -lLLVMRemarks -lLLVMRuntimeDyld -lLLVMScalarOpts -lLLVMSelectionDAG -lLLVMSupport -lLLVMSymbolize -lLLVMTableGen -lLLVMTarget -lLLVMTextAPI -lLLVMTransformUtils -lLLVMVectorize -lLLVMWindowsManifest -lLLVMX86AsmParser -lLLVMX86CodeGen -lLLVMX86Desc -lLLVMX86Disassembler -lLLVMX86Info -lLLVMX86Utils -lLLVMXRay -lLLVMipo -lMLIRAffineOps -lMLIRAffineToStandard -lMLIRAnalysis -lMLIRDialect -lMLIREDSC -lMLIREDSCInterface -lMLIRExecutionEngine -lMLIRFxpMathOps -lMLIRGPU -lMLIRGPUtoCUDATransforms -lMLIRGPUtoNVVMTransforms -lMLIRGPUtoROCDLTransforms -lMLIRGPUtoSPIRVTransforms -lMLIRGPUtoVulkanTransforms -lMLIRIR -lMLIRJitRunner -lMLIRLLVMIR -lMLIRLinalgAnalysis -lMLIRLinalgEDSC -lMLIRLinalgOps -lMLIRLinalgToLLVM -lMLIRLinalgToSPIRVTransforms -lMLIRLinalgTransforms -lMLIRLinalgUtils -lMLIRLoopAnalysis -lMLIRLoopOps -lMLIRLoopOpsTransforms -lMLIRLoopToStandard -lMLIRLoopsToGPU -lMLIRMlirOptMain -lMLIRNVVMIR -lMLIROpenMP -lMLIROptLib -lMLIRParser -lMLIRPass -lMLIRPlay -lMLIRQuantOps -lMLIRQuantizerFxpMathConfig -lMLIRQuantizerSupport -lMLIRQuantizerTransforms -lMLIRROCDLIR -lMLIRSDBM -lMLIRSPIRV -lMLIRSPIRVSerialization -lMLIRSPIRVTestPasses -lMLIRSPIRVTransforms -lMLIRShape -lMLIRStandardOps -lMLIRStandardToLLVM -lMLIRStandardToSPIRVTransforms -lMLIRSupport -lMLIRTargetLLVMIR -lMLIRTargetLLVMIRModuleTranslation -lMLIRTargetNVVMIR -lMLIRTargetROCDLIR -lMLIRTestDialect -lMLIRTestIR -lMLIRTestPass -lMLIRTestTransforms -lMLIRTransformUtils -lMLIRTransforms -lMLIRTranslateClParser -lMLIRTranslation -lMLIRVectorOps -lMLIRVectorToLLVM -lMLIRVectorToLoops -lz -lncurses
ld: warning: direct access in function 'mlir::Dialect::VariadicOperationAdder<mlir::AffineApplyOp, mlir::AffineDmaStartOp, mlir::AffineDmaWaitOp, mlir::AffineLoadOp, mlir::AffineStoreOp, mlir::AffineForOp, mlir::AffineIfOp, mlir::AffineMaxOp, mlir::AffineMinOp, mlir::AffineParallelOp, mlir::AffinePrefetchOp, mlir::AffineTerminatorOp>::addToSet(mlir::Dialect&)' from file '/Users/llvm-test/llvm-dpotop/lib/libMLIRAffineOps.a(AffineOps.cpp.o)' to global weak symbol 'mlir::OpState::getCanonicalizationPatterns(mlir::OwningRewritePatternList&, mlir::MLIRContext*)' from file 'main.o' means the weak symbol cannot be overridden at runtime. This was likely caused by different translation units being compiled with different visibility settings.
ld: warning: direct access in function 'mlir::Dialect::VariadicOperationAdder<mlir::AffineIfOp, mlir::AffineMaxOp, mlir::AffineMinOp, mlir::AffineParallelOp, mlir::AffinePrefetchOp, mlir::AffineTerminatorOp>::addToSet(mlir::Dialect&)' from file '/Users/llvm-test/llvm-dpotop/lib/libMLIRAffineOps.a(AffineOps.cpp.o)' to global weak symbol 'mlir::OpState::getCanonicalizationPatterns(mlir::OwningRewritePatternList&, mlir::MLIRContext*)' from file 'main.o' means the weak symbol cannot be overridden at runtime. This was likely caused by different translation units being compiled with different visibility settings.