[Bug c++/86347] Incorrect call order of allocation function in new expression

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86347

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |wrong-code
             Status|WAITING                     |NEW

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to stinkingmadgod from comment #2)
> Apologies, not familiar with netiquette here

That's why you're asked to read https://gcc.gnu.org/bugs/ before creating a bug
report.

Reduced:

typedef decltype(sizeof(0)) size_t;
extern "C" int puts(const char*);
extern "C" void* malloc(size_t);

void* operator new(size_t n)
{
    puts("new");
    return malloc(n);
}

struct Y
{
    Y() { puts("Y()"); }
    Y(const Y&)
    {
        puts("Y(const Y&)");
        throw "tantrum"; 
    }
};

struct X {
    X(Y) noexcept { }
};

int main()
{
    try
    {
        Y y;
        new X{y};
    }
    catch(...)
    {
    }
}

(In reply to stinkingmadgod from comment #0)
> Should have output
> new
> Y()
> Y(const Y&)

No, it should be:

Y()
new
Y(const Y&)


> But has output
> Y()
> Y(const Y&)
> 
> Without the throw statement, it has output
> Y()
> Y(const Y&)
> new

Confirmed.