https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108565
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |EH
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This is also exceptions related, that is -fno-exceptions causes no warning to
show up and also the function optimized too.
Also using malloc/free works too:
```
#if 1
int *mymalloc(int t)
{
int *a = (int*)__builtin_malloc(sizeof(int));
*a = t;
return a;
}
void myfree(int *a)
{
__builtin_free(a);
}
#else
#include <new>
int *mymalloc(int t)
{
return new int(t);
}
void myfree(int *a)
{
delete a;
}
#endif
struct shared_ptr {
int *counter_ = nullptr;
int *data_ = nullptr;
shared_ptr(int *data)
{
// try {
counter_ = (data ? mymalloc(1) : nullptr);
// }catch(...) {
// counter_ = nullptr;
// throw;
// }
data_ = (data);
}
shared_ptr(const shared_ptr &other)
: counter_(other.counter_), data_(other.data_) {
if (counter_ != nullptr) {
++*counter_;
}
}
~shared_ptr() {
if (counter_ != nullptr) {
--*counter_;
if (*counter_ == 0) {
myfree(counter_);
myfree(data_);
}
}
}
};
void foo() {
shared_ptr a(mymalloc(10)); // should be non-nullptr
shared_ptr b(a);
shared_ptr c(mymalloc(20)); // should be non-nullptr
}
int main() {
foo();
}
```
