https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100699
Bug ID: 100699
Summary: g++ doesn't warn uninitialized field when the class is
derived from another class
Product: gcc
Version: 11.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: mytbk920423 at gmail dot com
Target Milestone: ---
GCC doesn't warn on the following code when class B is a derived class.
----------------------- test.hh ---------------------------
#include <stdio.h>
class Base
{
int v;
public:
Base(int u): v(u) {}
int get() { return v; }
};
class A
{
int a;
public:
A(int a_): a(a_) {}
void print() { printf("%d\n", a); }
};
class B: public Base
{
A a;
int b;
public:
B(int b_);
void print() { a.print(); }
};
------------------ end of test.hh -----------------------
------------------------- test.cpp -------------------------
#include "test.hh"
B::B(int b_):
Base(b_),
a(b), b(100)
{}
------------------------ end of test.cpp -------------------
clang++ warns as follows:
$ clang++ -Og -g -Wall -Wextra -c test.cpp
test.cpp:5:4: warning: field 'b' is uninitialized when used here
[-Wuninitialized]
a(b), b(100)
^
1 warning generated.
