[LLVMdev] LLVM Basic Program Compilation

[Prakash Premkumar]

I am just getting started with llvm.

Here's code I am trying to compile:

#include <stdio.h>#include "llvm/IR/LLVMContext.h"#include
"llvm/IR/Module.h"#include "llvm/IR/IRBuilder.h"

int main(){
  llvm::LLVMContext& context = llvm::getGlobalContext();
  llvm::Module* module = new llvm::Module("top", context);
  llvm::IRBuilder<> builder(context);

  module->dump( );}

when i compile with :

llvm-g++ try.cpp  -D__STDC_CONSTANT_MACROS -D__STDC_LIMIT_MACROS
`llvm-config --cxxflags --ldflags --libs`

 I get the a.out file. No worries.

But, I am interested in getting the LLVM IR file.So, I compiled with

llvm-g++ try.cpp  -D__STDC_CONSTANT_MACROS -D__STDC_LIMIT_MACROS -S -emit-llvm
lli try.s

 I get an error saying

LLVM ERROR: Program used external function
'_ZN4llvm16getGlobalContextEv' which could not be resolved!

 The command :

llvm-g++ try.cpp  -D__STDC_CONSTANT_MACROS -D__STDC_LIMIT_MACROS
`llvm-config --cxxflags --ldflags --libs` -S -emit-llvm

 leaves me with several warnings and when i execute the resultant .s file
with lli , I get the same error as before.

Thanks a lot for your help


Thank you,

Prakash Premkumar
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