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pausch

Member

Registered: 2012-01-08

Posts: 17

Compilation fails

Hi there

I am trying to compile a shared library with gcc for usage in java JNI. But the compilation of a simple HelloWorld program fails.

The compilation output is the following:
[paul@HP-ARCH JNIGeany]$ cc -shared -I/usr/lib/jvm/java-6-openjdk/include/ -I/usr/lib/jvm/java-6-openjdk/include/linux TestLib.cpp
/usr/bin/ld: /tmp/ccyze1mb.o: relocation R_X86_64_32 against `_ZSt4cout' can not be used when making a shared object; recompile with -fPIC
/tmp/ccyze1mb.o: could not read symbols: Bad value
collect2: error: ld returned 1 exit status

The cpp file:

#include<iostream>
#include<jni.h>
#include "de_schaefer_jnitest_HelloWorld.h"   // this header file was generated by javah

using namespace std;
JNIEXPORT void JNICALL Java_HelloWorld_Output(JNIEnv *env, jobject obj, jstring value) 
{
  cout << value;
}

int main() {
	cout << "Test" << endl;
	
}

I am posting this stuff here because I think maybe ld works wrong...

Thanks...

Last edited by pausch (2012-06-12 22:54:04)

Trilby

Inspector Parrot

Registered: 2011-11-29

Posts: 29,523

Website

Re: Compilation fails

First, using code tags would make this much easier to read, and make you much more likely to get help.

Second, read error messages.  Did you recompile with "-fPIC"?

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"UNIX is simple and coherent..." - Dennis Ritchie, "GNU's Not UNIX" -  Richard Stallman

pausch

Member

Registered: 2012-01-08

Posts: 17

Re: Compilation fails

Sorry I didnt knew that this is possible here...