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[Bug c++/53398] New: feature request: option for overloaded methods order in vtable compatibility with msc
- From: "sweetrommie at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Fri, 18 May 2012 13:06:28 +0000
- Subject: [Bug c++/53398] New: feature request: option for overloaded methods order in vtable compatibility with msc
- Auto-submitted: auto-generated
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53398
Bug #: 53398
Summary: feature request: option for overloaded methods order
in vtable compatibility with msc
Classification: Unclassified
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: c++
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: sweetrommie@gmail.com
The target of this topic is about mingw and ms compiler incompatibility.
GCC places overloaded virtual functions in order they appear in class
declaration.
In opposite msc reverts them.
Assuming we have a dll compiled in msc and such header for using the dll:
class A {
virutal void overl(void) = 0;
virutal void fun1(void) = 0;
virutal void overl(int i) = 0;
virutal void overl(double d) = 0;
virutal void fun2(void) = 0;
virutal void overl(char *c) = 0;
};
to use it with mingw compiler we need to change it to
class A {
virutal void overl(char *c) = 0;
virutal void fun1(void) = 0;
virutal void overl(double d) = 0;
virutal void overl(int i) = 0;
virutal void fun2(void) = 0;
virutal void overl(void) = 0;
};
or to portable version, which removes overloading (behave gcc ordering)
class A {
virutal void overlC(char *c) = 0;
virutal void fun1(void) = 0;
virutal void overlD(double d) = 0;
virutal void overlI(int i) = 0;
virutal void fun2(void) = 0;
virutal void overlV(void) = 0;
};
It would be nice to have some option to just say the compiler to use different
order.
We could have an option added to a compiler like -fvisibility-ms-compat or
-fabi-version=n.
Or maybe better by something like pragma pack push, so we can do:
#pragma vtorder(push, reverted)
#include "dll_header.h"
#pragma vtorder(pop)