Formally: The check to see if a function returns void fails when you have a
member function pointer of a class of incomplete type.
The following code fails to compile on gcc 4.0.0
This is a regression. It compiled on gcc 3.x, and 2.95
It also compiles on MSVC7,7.1,8.0, Intel (x86 + Itanium), Digital Mars, Comeau,
Metrowerks 7, Borland, Open Watcom, PGI.
Although it is an obscure bug, it is important for my 'FastDelegate' library at
CodeProject, which has become extremely popular -- a surprising number of people
are affected by this bug.
bug.cpp: In function 'void failingfunc()':
bug.cpp:13: error: return-statement with a value, in function returning 'void'
--------------------------------------
// works on gcc 3.x, and all other compilers.
// if change 'void' to 'int', it works.
// if change 'class A;' to 'class A{};', it works.
class A;
typedef void (A::*VoidMemFn)();
void failingfunc() {
A *p;
VoidMemFn z;
return (p->*z)();
}
int main(void)
{
failingfunc();
return 0;
}
--
Summary: Void functions can't return invocation of pointers to
void member functions
Product: gcc
Version: 4.0.0
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: donaldc at csgsolar dot com dot au
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21762
