llvm dev - Jul 2009 - [LLVMdev] LLVM Hello Pass load error when using opt -load Hello.so

While learning to write LLVM passes and following the precise 
instructions under http://llvm.org/docs/WritingAnLLVMPass.html, 
<http://llvm.org/docs/WritingAnLLVMPass.html>
I got this error when loading the hello pass to run the test program:

opt -load ./Release/lib/Hello.so -hello < test/test.bc > /dev/null
Error opening './Release/lib/Hello.so': ./Release/lib/Hello.so: 
undefined symbol: 
_ZSt16__ostream_insertIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_PKS3_i
  -load request ignored.
  opt: Unknown command line argument '-hello'.  Try: 'opt
--help'
  make: *** [run_lib] Error 1

I think I might have missed a LLVM lib file, but can't figure out which.

I double checked the Makefile, it does have the libLLVMCore.a, 
libLLVMSystem.a and libLLVMSupport.a specified.

Could people suggest?

All are based on the LLVM  2.5 release, running on Debian4-i386.

Thank you very much

Chuck



Hello.cpp file:
#include "llvm/Pass.h"
#include "llvm/Function.h"

using namespace llvm;

namespace {
  struct Hello : public FunctionPass {
   
    static char ID;
    Hello() : FunctionPass(&ID) {}

    virtual bool runOnFunction(Function &F) {
      llvm::cerr << "Hello: " << F.getName() <<
"\n";
      return false;
    }
  };
 
  char Hello::ID = 0;
  RegisterPass<Hello> X("hello", "Hello World Pass");
}


Makefile:
# Makefile for hello pass

# Path to top level of LLVM heirarchy
LEVEL = .

# Name of the library to build
LIBRARYNAME = Hello

# Make the shared library become a loadable module so the tools can
# dlopen/dlsym on the resulting library.
LOADABLE_MODULE = 1

# Tell the build system which LLVM libraries your pass needs. You'll 
probably
# need at least LLVMSystem.a, LLVMSupport.a, LLVMCore.a but possibly several
# others too.
LLVMLIBS = LLVMCore.a LLVMSupport.a LLVMSystem.a

# Include the makefile implementation stuff
include $(LEVEL)/Makefile.common


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Hey Chuck,

I'm afraid I can't reproduce your error but...a problem you may run
into later is that opt will complain with

opt: llvm/lib/VMCore/Pass.cpp:149:
void<unnamed>::PassRegistrar::RegisterPass(const llvm::PassInfo&):
Assertion `Inserted && "Pass registered multiple times!"'
failed.
Aborted

I "fixed" this by replacing the LLVMLIBS line in the Makefile with
LINK_COMPONENTS according to this tutorial
http://llvm.org/docs/MakefileGuide.html#LoadableModules
and was able to build/run my pass properly.

-shu

On Jul 17, 11:48 am, Chuck Zhao <cz... at eecg.toronto.edu>
wrote:
> While learning to write LLVM passes and following the precise
> instructions underhttp://llvm.org/docs/WritingAnLLVMPass.html,
> <http://llvm.org/docs/WritingAnLLVMPass.html>
> I got this error when loading the hello pass to run the test program:
>
> opt -load ./Release/lib/Hello.so -hello < test/test.bc > /dev/null
> Error opening './Release/lib/Hello.so': ./Release/lib/Hello.so:
> undefined symbol:
>
_ZSt16__ostream_insertIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_PKS3_i
>   -load request ignored.
>   opt: Unknown command line argument '-hello'.  Try: 'opt
--help'
>   make: *** [run_lib] Error 1
>
> I think I might have missed a LLVM lib file, but can't figure out
which.
>
> I double checked the Makefile, it does have the libLLVMCore.a,
> libLLVMSystem.a and libLLVMSupport.a specified.
>
> Could people suggest?
>
> All are based on the LLVM  2.5 release, running on Debian4-i386.
>
> Thank you very much
>
> Chuck
>
> Hello.cpp file:
> #include "llvm/Pass.h"
> #include "llvm/Function.h"
>
> using namespace llvm;
>
> namespace {
>   struct Hello : public FunctionPass {
>
>     static char ID;
>     Hello() : FunctionPass(&ID) {}
>
>     virtual bool runOnFunction(Function &F) {
>       llvm::cerr << "Hello: " << F.getName() <<
"\n";
>       return false;
>     }
>   };
>
>   char Hello::ID = 0;
>   RegisterPass<Hello> X("hello", "Hello World
Pass");
>
> }
>
> Makefile:
> # Makefile for hello pass
>
> # Path to top level of LLVM heirarchy
> LEVEL = .
>
> # Name of the library to build
> LIBRARYNAME = Hello
>
> # Make the shared library become a loadable module so the tools can
> # dlopen/dlsym on the resulting library.
> LOADABLE_MODULE = 1
>
> # Tell the build system which LLVM libraries your pass needs. You'll
> probably
> # need at least LLVMSystem.a, LLVMSupport.a, LLVMCore.a but possibly
several
> # others too.
> LLVMLIBS = LLVMCore.a LLVMSupport.a LLVMSystem.a
>
> # Include the makefile implementation stuff
> include $(LEVEL)/Makefile.common
>
> _______________________________________________
> LLVM Developers mailing list
> LLVM... at cs.uiuc.edu      
 http://llvm.cs.uiuc.eduhttp://lists.cs.uiuc.edu/mailman/listinfo/llvmdev

Thanks, Shu,

I guess I haven't updated since my post went out.
There are actually 2 problems:

1. mis-compilation:
My LLVM-2.5 turned out to be mis-compiled using gcc-4.4.0 (surprise to 
me) on Debian4-32b.
I tried a few different compilers, and gcc-4.0.4 (a relatively old one, 
again surprised me) seems to work out fine.

Question: is there a good/quick/reliable way to figure out whether a 
certain gcc compiler will mis-compile?

2. I ran into exactly the problem you pointed out. (Thank you)
The Makefile needs some update (after careful comparison between the 
tutorial Makefile and the makefile used for lib/Transformation/Hello), by
commenting out the following line:

#LLVMLIBS = LLVMCore.a LLVMSystem.a LLVMSupport.a

I guess the tutorial needs some update, as with release 2.5 things might 
have changed a bit.

Thanks for the reply


Chuck


Shuguang Feng wrote:
> Hey Chuck,
>
> I'm afraid I can't reproduce your error but...a problem you may run
> into later is that opt will complain with
>
> opt: llvm/lib/VMCore/Pass.cpp:149:
> void<unnamed>::PassRegistrar::RegisterPass(const
llvm::PassInfo&):
> Assertion `Inserted && "Pass registered multiple
times!"' failed.
> Aborted
>
> I "fixed" this by replacing the LLVMLIBS line in the Makefile
with
> LINK_COMPONENTS according to this tutorial
http://llvm.org/docs/MakefileGuide.html#LoadableModules
> and was able to build/run my pass properly.
>
> -shu
>
> On Jul 17, 11:48am, Chuck Zhao <cz... at eecg.toronto.edu> wrote:
>   
>> While learning to write LLVM passes and following the precise
>> instructions underhttp://llvm.org/docs/WritingAnLLVMPass.html,
>> <http://llvm.org/docs/WritingAnLLVMPass.html>
>> I got this error when loading the hello pass to run the test program:
>>
>> opt -load ./Release/lib/Hello.so -hello < test/test.bc >
/dev/null
>> Error opening './Release/lib/Hello.so': ./Release/lib/Hello.so:
>> undefined symbol:
>>
_ZSt16__ostream_insertIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_PKS3_i
>>   -load request ignored.
>>   opt: Unknown command line argument '-hello'. Try: 'opt
--help'
>>   make: *** [run_lib] Error 1
>>
>> I think I might have missed a LLVM lib file, but can't figure out
which.
>>
>> I double checked the Makefile, it does have the libLLVMCore.a,
>> libLLVMSystem.a and libLLVMSupport.a specified.
>>
>> Could people suggest?
>>
>> All are based on the LLVM  release, running on Debian4-i386.
>>
>> Thank you very much
>>
>> Chuck
>>
>> Hello.cpp file:
>> #include "llvm/Pass.h"
>> #include "llvm/Function.h"
>>
>> using namespace llvm;
>>
>> namespace {
>>   struct Hello : public FunctionPass {
>>
>>     static char ID;
>>     Hello() : FunctionPass(&ID) {}
>>
>>     virtual bool runOnFunction(Function &F) {
>>       llvm::cerr << "Hello: " << F.getName()
<< "\n";
>>       return false;
>>     }
>>   };
>>
>>   char Hello::ID = 0;
>>   RegisterPass<Hello> X("hello", "Hello World
Pass");
>>
>> }
>>
>> Makefile:
>> # Makefile for hello pass
>>
>> # Path to top level of LLVM heirarchy
>> LEVEL = .
>>
>> # Name of the library to build
>> LIBRARYNAME = Hello
>>
>> # Make the shared library become a loadable module so the tools can
>> # dlopen/dlsym on the resulting library.
>> LOADABLE_MODULE = 1
>>
>> # Tell the build system which LLVM libraries your pass needs.
You'll
>> probably
>> # need at least LLVMSystem.a, LLVMSupport.a, LLVMCore.a but possibly
several
>> # others too.
>> LLVMLIBS = LLVMCore.a LLVMSupport.a LLVMSystem.a
>>
>> # Include the makefile implementation stuff
>> include $(LEVEL)/Makefile.common
>>
>> _______________________________________________
>> LLVM Developers mailing list
>> LLVM... at cs.uiuc.edu      
http://llvm.cs.uiuc.eduhttp://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
>   
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