[LLVMdev] LLVM Basic Program Compilation

[Prakash Premkumar]

Thank you Chris.

I am using llvm-3.4.2. I am facing the same issue when using clang++ as
well.

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

gives me errors

$clang++ try.cpp  -D__STDC_CONSTANT_MACROS -D__STDC_LIMIT_MACROS  -S
-emit-llvm

$ lli try.s


gives me Program used external function '_ZN4llvm16getGlobalContextEv'
which could not be resolved!


Thank you


On Fri, Aug 1, 2014 at 7:25 PM, Chris Cadwallader <ccadwallader at arxan.com>
wrote:

> 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>
> 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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