Symbol Look Up Error

ROOT
1

Hi Guys!

I have been trying to create a custom library that I would like to load into CINT. This is what I have so far:

mean.h

mean.cpp

[code]#include “mean.h”

int mean(int a, int b)
{
return (a+b)/2;
}
[/code]

extlib.h

[code] #ifndef EXTLIB
#define EXTLIB

      #ifndef __MAKECINT__
 
     // Include extlib's original header file here.
     // This part is only read by C++ compiler.
     #include "mean.h"
 
     #else  // __MAKECINT__

 
     // Declare interface to the external library.
     // This part is read by cint/makecint only and 
     // must be described within cint limitation.
     // #pragma link statements can be added as option.
 		
     void mean(int a, int b);

 #pragma link C++ function mean;

     #endif  // __MAKECINT__
  
     #endif // EXTLIB

[/code]

Makefile

all: mean.o gcc -shared -Wl,-soname,libmean.so.1 -o libmean.so.1.0.1 ln -s libmean.so.1.0.1 libmean.so.1 ln -s libmean.so.1.0.1 libmean.so

I then run the following commands

makecint -mk makefile2 -dl extlib.dll -H extlib.h -l libmean.so make -f makefile2

which produces extlib.dll

Then I run

cint extlib.dll mean(2,4) cint: symbol lookup error: ./extlib.dll: undefined symbol: _Z4meanii

Any suggestions on how to fix this problem?

Radu

2

Hi Radu,

[quote]gcc -shared -Wl,-soname,libmean.so.1 -o libmean.so.1.0.1
[/quote]Seems to be missing the actual object file (mean.o or something like that).

Cheers,.
Philippe.

3

Well that was a bit embarrassing :slight_smile:

It works now and thank you for the help. Now on to trying to import a large library.

Radu