Use printing methods of third-party libraries that use std::ostream

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1

Hi all,

I need to use the printing methods from a third-party library. The
problem is those methods use std::cout but the use of std::ostream
methods seems to be disabled in latest versions of LLVM.

I'm aware of raw_os_ostream
(http://llvm.org/doxygen/classllvm_1_1raw__os__ostream.html) which
takes a std::ostream as input. E.g., I could do something like:

#include "llvm/Support/raw_os_ostream.h"
#include "llvm/Support/raw_ostream.h"

raw_os_ostream * rout = new raw_os_ostream(std::cout); // 1
// From now on, use rout rather than std::cout // 2

The problem is that I get the error just with line 1 alone:

undefined symbol: _ZTVN4llvm14raw_os_ostreamE

What I am doing wrong? How can use the printing methods of my
third-party library?

P.S. Just in case, I use clang and llvm 3.0 in a linux machine.

Many thanks!

Jorge

2

I have exactly same problem. Did you find any solutions?

3

Hi Jorge,

I need to use the printing methods from a third-party library. The
problem is those methods use std::cout but the use of std::ostream
methods seems to be disabled in latest versions of LLVM.

I'm aware of raw_os_ostream
(http://llvm.org/doxygen/classllvm_1_1raw__os__ostream.html) which
takes a std::ostream as input. E.g., I could do something like:

#include "llvm/Support/raw_os_ostream.h"
#include "llvm/Support/raw_ostream.h"

raw_os_ostream * rout = new raw_os_ostream(std::cout); // 1
// From now on, use rout rather than std::cout // 2

The problem is that I get the error just with line 1 alone:

undefined symbol: _ZTVN4llvm14raw_os_ostreamE

did you link with libLLVMSupport?

Ciao, Duncan.

4

Hi Jorge,

> I need to use the printing methods from a third-party library. The
> problem is those methods use std::cout but the use of std::ostream
> methods seems to be disabled in latest versions of LLVM.
>
> I'm aware of raw_os_ostream
> (http://llvm.org/doxygen/classllvm_1_1raw__os__ostream.html) which
> takes a std::ostream as input. E.g., I could do something like:
>
> #include "llvm/Support/raw_os_ostream.h"
> #include "llvm/Support/raw_ostream.h"
>
> raw_os_ostream * rout = new raw_os_ostream(std::cout); // 1
> // From now on, use rout rather than std::cout // 2
>
> The problem is that I get the error just with line 1 alone:
>
> undefined symbol: _ZTVN4llvm14raw_os_ostreamE

did you link with libLLVMSupport?

I didn't. I do now and it solves the problem.

Thanks!

Jorge