[LLVMdev] LLVM Basic Program Compilation

[Chris Cadwallader]

What version of LLVM are you using? llvm-gcc was deprecated a long time ago, and while it doesn’t directly address your question, I suggest trying with clang(++).

- Chris

On Aug 1, 2014, at 8:32 AM, Prakash Premkumar <prakash.prax at gmail.com<mailto:prakash.prax at gmail.com>> wrote:


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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