[llvm-dev] Lots of linker errors when trying to link with the LLVM C++ API

[mats petersson via llvm-dev]

You need your `llvm-config <stuff>` after the source file, so that it links
in AFTER the source you are compiling - otherwise the linker will just skip
over the whole library and say "well, nothing is using any of this, nothing
is needed".

--
Mats

On 11 April 2017 at 15:43, Nabeel Omer via llvm-dev <llvm-dev at lists.llvm.org
> wrote:

> Hello LLVM Developers,
> I am trying to compile the program in llvm/examples/ModuleMaker/
> ModuleMaker.cpp.
> I am executing the following command:
>
> clang++ --std=c++14 `llvm-config --cxxflags --ldflags --libs --libfiles
> --system-libs` ~/src/llvm/examples/ModuleMaker/ModuleMaker.cpp
>
> The linker produces the following errors:
>
> /tmp/ModuleMaker-f710af.o: In function `main':
> /home/nabeel/src/llvm/examples/ModuleMaker/ModuleMaker.cpp:(.text.main+0x17):
> undefined reference to `llvm::LLVMContext::LLVMContext()'
> /home/nabeel/src/llvm/examples/ModuleMaker/ModuleMaker.cpp:(.text.main+0x3b):
> undefined reference to `llvm::Module::Module(llvm::StringRef,
> llvm::LLVMContext&)'
> /home/nabeel/src/llvm/examples/ModuleMaker/ModuleMaker.cpp:(.text.main+0x43):
> undefined reference to `llvm::Type::getInt32Ty(llvm::LLVMContext&)'
> /home/nabeel/src/llvm/examples/ModuleMaker/ModuleMaker.cpp:(.text.main+0x4d):
> undefined reference to `llvm::FunctionType::get(llvm::Type*, bool)'
> /home/nabeel/src/llvm/examples/ModuleMaker/ModuleMaker.cpp:(.text.main+0x70):
> undefined reference to `llvm::User::operator new(unsigned long)'
> /home/nabeel/src/llvm/examples/ModuleMaker/ModuleMaker.cpp:(.text.main+0x88):
> undefined reference to `llvm::Function::Function(llvm::FunctionType*,
> llvm::GlobalValue::LinkageTypes, llvm::Twine const&, llvm::Module*)'
> /home/nabeel/src/llvm/examples/ModuleMaker/ModuleMaker.cpp:(.text.main+0xc1):
> undefined reference to `llvm::BasicBlock::BasicBlock(llvm::LLVMContext&,
> llvm::Twine const&, llvm::Function*, llvm::BasicBlock*)'
> /home/nabeel/src/llvm/examples/ModuleMaker/ModuleMaker.cpp:(.text.main+0xc9):
> undefined reference to `llvm::Type::getInt32Ty(llvm::LLVMContext&)'
> /home/nabeel/src/llvm/examples/ModuleMaker/ModuleMaker.cpp:(.text.main+0xd8):
> undefined reference to `llvm::ConstantInt::get(llvm::IntegerType*,
> unsigned long, bool)'
> /home/nabeel/src/llvm/examples/ModuleMaker/ModuleMaker.cpp:(.text.main+0xe3):
> undefined reference to `llvm::Type::getInt32Ty(llvm::LLVMContext&)'
> /home/nabeel/src/llvm/examples/ModuleMaker/ModuleMaker.cpp:(.text.main+0xf2):
> undefined reference to `llvm::ConstantInt::get(llvm::IntegerType*,
> unsigned long, bool)'
> /home/nabeel/src/llvm/examples/ModuleMaker/ModuleMaker.cpp:(.text.main+0x120):
> undefined reference to `llvm::BinaryOperator::Create(llvm::Instruction::BinaryOps,
> llvm::Value*, llvm::Value*, llvm::Twine const&, llvm::Instruction*)'
> /home/nabeel/src/llvm/examples/ModuleMaker/ModuleMaker.cpp:(.text.main+0x133):
> undefined reference to `llvm::SymbolTableListTraits<llvm::Instruction>::
> addNodeToList(llvm::Instruction*)'
> /home/nabeel/src/llvm/examples/ModuleMaker/ModuleMaker.cpp:(.text.main+0x160):
> undefined reference to `llvm::User::operator new(unsigned long, unsigned
> int)'
> /home/nabeel/src/llvm/examples/ModuleMaker/ModuleMaker.cpp:(.text.main+0x173):
> undefined reference to `llvm::ReturnInst::ReturnInst(llvm::LLVMContext&,
> llvm::Value*, llvm::Instruction*)'
> /home/nabeel/src/llvm/examples/ModuleMaker/ModuleMaker.cpp:(.text.main+0x17e):
> undefined reference to `llvm::SymbolTableListTraits<llvm::Instruction>::
> addNodeToList(llvm::Instruction*)'
> /home/nabeel/src/llvm/examples/ModuleMaker/ModuleMaker.cpp:(.text.main+0x19d):
> undefined reference to `llvm::outs()'
> /home/nabeel/src/llvm/examples/ModuleMaker/ModuleMaker.cpp:(.text.main+0x1af):
> undefined reference to `llvm::WriteBitcodeToFile(llvm::Module const*,
> llvm::raw_ostream&, bool, llvm::ModuleSummaryIndex const*, bool)'
> /home/nabeel/src/llvm/examples/ModuleMaker/ModuleMaker.cpp:(.text.main+0x1b7):
> undefined reference to `llvm::Module::~Module()'
> /home/nabeel/src/llvm/examples/ModuleMaker/ModuleMaker.cpp:(.text.main+0x1c7):
> undefined reference to `llvm::LLVMContext::~LLVMContext()'
> /tmp/ModuleMaker-f710af.o:(.data._ZN4llvm30VerifyDisableABIBreakingChecksE+0x0):
> undefined reference to `llvm::DisableABIBreakingChecks'
> clang-4.0: error: linker command failed with exit code 1 (use -v to see
> invocation)
> Makefile:2: recipe for target 'all' failed
> make: *** [all] Error 1
>
> The output of `clang -v`:
>
> clang version 4.0.0 (tags/RELEASE_400/final)
> Target: x86_64-unknown-linux-gnu
> Thread model: posix
> InstalledDir: /home/nabeel/bin/clang/bin
> Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/6
> Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/6.2.0
> Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
> Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.2.0
> Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.2.0
> Candidate multilib: .;@m64
> Selected multilib: .;@m64
>
> From what I understand, there should be no linker errors because
> llvm-config produces the names of all the libraries that are distributed
> with LLVM.
>
> Any help will be enormously appreciated.
>
> Nabeel Omer
> Systems Programmer, Undergraduate Student, Aspiring Computer Scientist
> https://nabeelomer.github.io
> <http://nabeelomer.xyz>
>
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> llvm-dev at lists.llvm.org
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>
>
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