[Bug ld/12762] New: lto produces multiple definition errors for virtual function

[vanboxem.ruben at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12762

           Summary: lto produces multiple definition errors for virtual
                    function
           Product: binutils
           Version: 2.22 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
        AssignedTo: address@hidden
        ReportedBy: address@hidden


I don't know if this is a GCC or ld bug, but as the error happens in the link
stage, I'm posting it here.

To reproduce:

class.h
-------
class A
{
public:
    virtual ~A() {}
};
class B : public A
{
public:
    ~B() {}
};

class.cpp
---------
#include "class.h" // just make sure there's more than one object file

main.cpp

#include "class.h"
int main()
{
    B b;
    return 0;
}

Compile with "g++ -flto" from the 4.6 branch and link with "g++ -flto" which
invokes ld and collect2. Produced errors:

release/class.o (symbol from plugin):(.text+0x0): multiple definition of
`typeinfo for A'
release/main.o (symbol from plugin):(.text+0x0): first defined here
release/class.o (symbol from plugin):(.text+0x0): multiple definition of
`typeinfo name for A'
release/main.o (symbol from plugin):(.text+0x0): first defined here
release/class.o (symbol from plugin):(.text+0x0): multiple definition of
`typeinfo for B'
release/main.o (symbol from plugin):(.text+0x0): first defined here
release/class.o (symbol from plugin):(.text+0x0): multiple definition of
`typeinfo name for B'
release/main.o (symbol from plugin):(.text+0x0): first defined here
collect2: ld returned 1 exit status

Please note that compiling Qmake (when configuring Qt) or a larger C++ project
with -flto produces multiple definitions of stuff like std::allocator operator
new and other standard C++ stuff.

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