Document: N1601
Date: 2012-01-27


Defect Report #4nn

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Submitter: Willem Wakker
Submission Date: 2012-01-27
Source:
Reference Document: N/A
Version: 1.0
Date: 2012-01-27
Subject: initialization

Summary

Consider the following code:
typedef struct {
int k;
int l;
int a[2];
} T;

typedef struct {
int i;
T t;
} S;

T x = {.l = 43, .k = 42, .a[1] = 19, .a[0] = 18 };

void f(void)
{
S l = { 1, .t = x, .t.l = 41, .t.a[1] = 17};
}

The question is: what is now the value of l.t.k? Is it 42 (due to the initialization of .t = x) or is it 0 (due to the fact that .t.l starts an incomplete initialization of .t?

The relevant clause from the standard is 6.7.9 clause 19:
19 The initialization shall occur in initializer list order, each initializer provided for a particular subobject overriding any previously listed initializer for the same subobject;151) all subobjects that are not initialized explicitly shall be initialized implicitly the same as objects that have static storage duration.

Suggested Technical Corrigendum


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