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

[Nabeel Omer via llvm-dev]

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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