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Date: Sun, 6 Mar 2016 23:27:13 +0100 (CET)
From: "Azatyan, Anushavan" <anushavan DOT azatyan AT desy DOT de>
To: cygwin AT cygwin DOT com
Message-ID: <1129585202.10528386.1457303233509.JavaMail.zimbra@desy.de>
Subject: library compilation undefined reference to extern function
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Hi,

I am compiling a huge library, which is written and compiled under Ubuntu, I have fixed some problems to get it compiled in cygwin.
The main() function is inside library. I stopped in some point which goes different in cygwin.
I have some functions which are declared as - extern void func(void);   Linker gives error - undefined reference to `func()'

then I tried with this to compare differences.. 

#include <iostream>
using namespace std;
extern void foo(void);
int main()
{
        cout<<" Print ";
        foo();
        return 0;
}

a very simple example I can compile in linux (Ubuntu) without any problem, but in cygwin it goes with linker errors - undefined reference, in both systems I use  

$ gcc -c -Wall -fpic filename.cc
$ gcc -shared -o libfoo.so filename.o

commands.
I could not find solution of this anywhere.

Thank you, 
Best regards, Anushavan

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