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Subject: [Bug c++/51757] New: friend defined inside class and declared inside main linker error
Date: Wed, 04 Jan 2012 22:38:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51757

             Bug #: 51757
           Summary: friend defined inside class and declared inside main
                    linker error
    Classification: Unclassified
           Product: gcc
           Version: 4.5.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: neotheone222@gmail.com


--------------------------------------------------------------------------------
gcc -v:

Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/x86_64-linux-gnu/gcc/x86_64-linux-gnu/4.5.2/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro
4.5.2-8ubuntu4' --with-bugurl=file:///usr/share/doc/gcc-4.5/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.5 --enable-shared --enable-multiarch
--with-multiarch-defaults=x86_64-linux-gnu --enable-linker-build-id
--with-system-zlib --libexecdir=/usr/lib/x86_64-linux-gnu
--without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.5 --libdir=/usr/lib/x86_64-linux-gnu
--enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --enable-plugin --enable-gold --enable-ld=default
--with-plugin-ld=ld.gold --enable-objc-gc --disable-werror --with-arch-32=i686
--with-tune=generic --enable-checking=release --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.5.2 (Ubuntu/Linaro 4.5.2-8ubuntu4) 

gcc command: g++ 1.cpp

gcc output: 

/tmp/cc9Q9mFy.o: In function `main':
1.cpp:(.text+0x5): undefined reference to `func()'
collect2: ld returned 1 exit status

--------------------------------------------------------------------------------

Here is the program that fails to link:

                                //1.cpp
#include <iostream>

class A
{
  public:
    friend void
    func()
    {
      std::cout << "Called" << std::endl;
    }
};

int
main()
{
  void
  func();

  func();   //linker error undefined reference to `func()'

  return 0;
}