g++ template instantiation bug

[Ares Lagae <ares dot lagae at cs dot kuleuven dot ac dot be>]

Sorry for emailing this directly to here, but this does not fit in a regular 
gcc bug report and involves linker errors. I dont even know if this is a gcc 
bug. However, this code compiles and links fine with icc.


// foo.h
#ifndef FOO
#define FOO

#include <iostream>

template <typename T>
void foo()
{
  std::cout << __PRETTY_FUNCTION__ << std::endl;
}

template <>
void foo<int>()
{
  std::cout << __PRETTY_FUNCTION__ << std::endl;
}

#endif


// bar1.h
#ifndef BAR1
#define BAR1

void bar1();

#endif


// bar2.h
#ifndef BAR2
#define BAR2

void bar2();

#endif


// bar1.cpp
#include "foo.h"
#include "bar1.h"
#include <iostream>

void bar1()
{
  std::cout << __PRETTY_FUNCTION__ << std::endl;
}



// bar2.cpp
#include "foo.h"
#include "bar2.h"
#include <iostream>

void bar2()
{
  std::cout << __PRETTY_FUNCTION__ << std::endl;
}



// main.cpp
#include "bar1.h"
#include "bar2.h"

int main(int argc, char* argv)
{
  bar1();
  bar2();
}


g++ bar1.cpp -c -o bar1.o
g++ bar2.cpp -c -o bar2.o
g++ main.cpp -c -o main.o
g++ bar1.o bar2.o main.o -o main


bar2.o(.text+0x0): In function `void foo<int>()':
: multiple definition of `void foo<int>()'
bar1.o(.text+0x0): first defined here
collect2: ld returned 1 exit status


gcc -v
Reading specs from /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.3/specs
Configured with: ./configure
Thread model: posix
gcc version 3.3

ld -v
GNU ld version 2.13.90.0.18 20030121 (SuSE Linux)


when the foo<int> template specialization is removed, everything works fine.



I would appreciate some feedback if possible.


Best regards,
Ares Lagae