[llvm-dev] Linker error while building a new back end in the latest LLVM from GitHub

[Alex Susu via llvm-dev]

Hello.
     I am trying to build against the latest LLVM source from GitHub (from Jan 23 2021) my 
Connex processor back end, which is mostly inspired from the BPF and Mips back end.
     I did my best to correct all the errors that appeared, but I now get a rather strange 
linker error that I don't know exactly how to solve (maybe somebody is more experienced 
than me on this). Maybe I have an error in lib/Target/Connex/CMakeLists.txt.

    The error I get while building LLVM is:
       <<cd /home/asusu/LLVM/llvm2021_01_23/llvm-project/build/lib/Target/Connex && 
/usr/bin/cmake -E cmake_link_script CMakeFiles/LLVMConnexCodeGen.dir/link.txt --verbose=1
       /usr/bin/c++ -fPIC  -fPIC -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-class-memaccess -Wno-redundant-move -Wno-noexcept-type -Wdelete-non-virtual-dtor 
-Wsuggest-override -Wno-comment -g 
  -Wl,-rpath-link,/home/asusu/LLVM/llvm2021_01_23/llvm-project/build/./lib   -Wl,-z,defs 
-Wl,-z,nodelete -shared -Wl,-soname,libLLVMConnexCodeGen.so.12git -o 
../../libLLVMConnexCodeGen.so.12git 
CMakeFiles/LLVMConnexCodeGen.dir/ConnexAsmPrinter.cpp.o 
CMakeFiles/LLVMConnexCodeGen.dir/ConnexFrameLowering.cpp.o 
CMakeFiles/LLVMConnexCodeGen.dir/ConnexHazardRecognizer.cpp.o 
CMakeFiles/LLVMConnexCodeGen.dir/ConnexInstrInfo.cpp.o 
CMakeFiles/LLVMConnexCodeGen.dir/ConnexISelDAGToDAG.cpp.o 
CMakeFiles/LLVMConnexCodeGen.dir/ConnexISelLowering.cpp.o 
CMakeFiles/LLVMConnexCodeGen.dir/ConnexMCInstLower.cpp.o 
CMakeFiles/LLVMConnexCodeGen.dir/ConnexRegisterInfo.cpp.o 
CMakeFiles/LLVMConnexCodeGen.dir/ConnexSelectionDAGInfo.cpp.o 
CMakeFiles/LLVMConnexCodeGen.dir/ConnexSubtarget.cpp.o 
CMakeFiles/LLVMConnexCodeGen.dir/ConnexTargetMachine.cpp.o  -Wl,-rpath,"\$ORIGIN/../lib" 
../../libLLVMAsmPrinter.so.12git ../../libLLVMConnexDesc.so.12git 
../../libLLVMConnexInfo.so.12git ../../libLLVMSelectionDAG.so.12git 
../../libLLVMCodeGen.so.12git ../../libLLVMTarget.so.12git ../../libLLVMMC.so.12git 
../../libLLVMCore.so.12git ../../libLLVMSupport.so.12git 
-Wl,-rpath-link,/home/asusu/LLVM/llvm2021_01_23/llvm-project/build/lib
       /usr/bin/ld: CMakeFiles/LLVMConnexCodeGen.dir/ConnexTargetMachine.cpp.o: in 
function `llvm::TargetTransformInfo::Model<llvm::ConnexTTIImpl>::~Model()':
       
/home/asusu/LLVM/llvm2021_01_23/llvm-project/llvm/include/llvm/Analysis/TargetTransformInfo.h:1672: 
undefined reference to `llvm::TargetTransformInfo::Concept::~Concept()'
       /usr/bin/ld: CMakeFiles/LLVMConnexCodeGen.dir/ConnexTargetMachine.cpp.o: in 
function 
`llvm::TargetTransformInfoImplCRTPBase<llvm::ConnexTTIImpl>::getUserCost(llvm::User 
const*, llvm::ArrayRef<llvm::Value const*>, llvm::TargetTransformInfo::TargetCostKind)':
       
/home/asusu/LLVM/llvm2021_01_23/llvm-project/llvm/include/llvm/Analysis/TargetTransformInfoImpl.h:911: 
undefined reference to `llvm::IntrinsicCostAttributes::IntrinsicCostAttributes(unsigned 
int, llvm::CallBase const&)'
       /usr/bin/ld: 
/home/asusu/LLVM/llvm2021_01_23/llvm-project/llvm/include/llvm/Analysis/TargetTransformInfoImpl.h:953: 
undefined reference to `llvm::TargetTransformInfo::getOperandInfo(llvm::Value const*, 
llvm::TargetTransformInfo::OperandValueProperties&)'
       ...
       ...
       /usr/bin/ld: 
/home/asusu/LLVM/llvm2021_01_23/llvm-project/llvm/include/llvm/CodeGen/BasicTTIImpl.h:1805: undefined 
reference to `llvm::IntrinsicCostAttributes::IntrinsicCostAttributes(unsigned int, 
llvm::Type*, llvm::ArrayRef<llvm::Type*>)'
       /usr/bin/ld: 
/home/asusu/LLVM/llvm2021_01_23/llvm-project/llvm/include/llvm/CodeGen/BasicTTIImpl.h:1826: undefined 
reference to `llvm::IntrinsicCostAttributes::IntrinsicCostAttributes(unsigned int, 
llvm::Type*, llvm::ArrayRef<llvm::Type*>, llvm::FastMathFlags)'
       collect2: error: ld returned 1 exit status>>


     Please find if you have the time also most of the source files of my Connex LLVM back 
end in the ZIP archive at this address: 
https://sites.google.com/site/alexsusu/myfilecabinet/Connex_be.zip (please note the file 
ERROR_LINKER.txt contains the above mentioned linker error).
     Please let me know if you want me to provide any further information about my build.

   Thank you very much,
     Alex