https://gcc.gnu.org/bugzilla/show_bug.cgi?id=19808
--- Comment #37 from Jonathan Wakely <redi at gcc dot gnu.org> ---
N.B. we should also warn using uninitialized members in default member
initializers, e.g. both of these should produce a warning:
struct X {
int x1 = x2;
int x2 = 0;
};
X x{}; // causes definition of default constructor
struct Y {
int y1 = y2;
int y2;
Y() : y2(0) { }
};
Clang warns about both:
defmeminit.cc:2:12: warning: field 'x2' is uninitialized when used here
[-Wuninitialized]
int x1 = x2;
^
defmeminit.cc:6:3: note: in implicit default constructor for 'X' first required
here
X x{};
^
defmeminit.cc:1:8: note: during field initialization in the implicit default
constructor
struct X {
^
defmeminit.cc:9:12: warning: field 'y2' is uninitialized when used here
[-Wuninitialized]
int y1 = y2;
^
defmeminit.cc:11:3: note: during field initialization in this constructor
Y() : y2(0) { }
^
2 warnings generated.
