Consider this C++ code:
template<typename T>
class c {
public:
T* operator->() const;
T* p;
};
struct s { int v; };
template<> s* c<s>::operator->() const { return p; }
int fn(c<s> p) { return p->v; }
Compiling this with g++ 4.3 gives me the symbol
_ZNK1cI1sEptEv
That is the symbol which is called by the function fn.
Compiling this with current mainline gives me the symbol
_ZNK1cI1sEdtEv
Note that the "pt" changed to a "dt". Again, that is the symbol called by the
function fn.
This seems to me to be an ABI change. It means that if I put the class c in a
library compiled with gcc 4.3, and try to link it with the function fn compiled
with gcc 4.4, I will get an undefined symbol error.
Why did the mangling change? It seems to me that this change should be
reverted before gcc 4.4 is released.
--
Summary: C++ mangling change seems to break ABI
Product: gcc
Version: 4.4.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: ian at airs dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39122
