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Automatically detects simple violations of this rule, although it may return some false positives. It may not catch more complex violations, such as initialization within functions taking uninitialized variables as arguments. It does catch the second noncompliant code example, and can be extended to catch the first as well

UNINIT

uninitvar
uninitdata
uninitstring
uninitMemberVar
uninitStructMember

Detects uninitialized variables, uninitialized pointers, uninitialized struct members, and uninitialized array elements (However, if one element is initialized, then cppcheck assumes the array is initialized.)
There are FN compared to some other tools because Cppcheck tries to avoid FP in impossible paths.

Can detect some violations of this rule when the -Wuninitialized flag is used

UNINIT.HEAP.MIGHT
UNINIT.HEAP.MUST
UNINIT.STACK.ARRAY.MIGHT
UNINIT.STACK.ARRAY.MUST UNINIT.STACK.ARRAY.PARTIAL.MUST
UNINIT.STACK.MIGHT
UNINIT.STACK.MUST

53 D, 69 D, 631 S, 652 S

Fully implemented

Non-initialized pointer,
Non-initialized variable

Pointer not initialized before dereference

Variable not initialized before use