llvm dev - Jan 2012 - [LLVMdev] Use printing methods of third-party libraries that use std::ostream

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

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

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.
>
> 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
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev

On Tuesday, January 31, 2012 at 10:28:36 (+0100), Duncan Sands
wrote:
>> 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
>> Ciao, Duncan.
>> 
>> >
>> > 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
>> > _______________________________________________
>> > LLVM Developers mailing list
>> > LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>> > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>> 
>> _______________________________________________
>> LLVM Developers mailing list
>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev