On Sat, 1 Feb 2025 at 11:41, Jonathan Wakely <jwakely.gcc@xxxxxxxxx> wrote:
>
> On Sat, 1 Feb 2025 at 08:59, Creeperxie via Gcc-help
> <gcc-help@xxxxxxxxxxx> wrote:
> >
> > Dear list,
> >
> > I would like to discuss the behavior of constructors with default
> > arguments in
> > GCC.
> >
> > In Clang, if a constructor redeclared with a default argument, it throws an
> > error, indicating the constructor has become a default constructor. The
> > early
> > detection helps prevent potential issues for users.
> >
> > Here is an example to illustrate the issue.
> >
> > class Example {
> > Example(int arg);
> > Example(float arg);
> > };
> >
> > Example::Example(int arg = 0) {
> > }
> >
> > Example::Example(float arg = 0) {
> > }
> >
> > When compiled with Clang, the following error is generated:
> >
> > error: addition of default argument on redeclaration makes this
> > constructor a default constructor
> >
> > Will GCC consider implementing a similar warning for this situation?
>
> Please file a bug https://gcc.gnu.org/bugs
>
> In C++11 the code above was valid, but it's ill-formed since C++14. It
> looks like GCC never implemented that change.
Actually we already have a bug report about it:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58194
