http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56683
Bug #: 56683
Summary: Function types with different language linkages not
distinct
Classification: Unclassified
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: j...@59a2.org
Section 7.5.1 of C++98 and C++11 states:
Two function types with different language linkages are
distinct types even if they are otherwise identical.
If the types are distinct, then surely we can overload on that basis:
extern "C" typedef int (*CPtr)(void);
extern "C++" typedef int (*CxxPtr)(void);
int Klutz(CPtr f) { return f(); }
int Klutz(CxxPtr f) { return f(); }
This compiles cleanly with Sun and Cray C++ compilers, but not with GCC, Clang,
Intel, MSVC, IBM XL, PathScale, or PGI.
$ g++ klutz.cc
klutz.cc: In function ‘int Klutz(CxxPtr)’:
klutz.cc:5:5: error: redefinition of ‘int Klutz(CxxPtr)’
klutz.cc:4:5: error: ‘int Klutz(CPtr)’ previously defined here
