1*f764dc99Sserge-sans-paille // RUN: %clang_cc1 -verify -fstrict-flex-arrays=2 %s
2*f764dc99Sserge-sans-paille 
3*f764dc99Sserge-sans-paille // We cannot know for sure the size of a flexible array.
4*f764dc99Sserge-sans-paille struct t {
5*f764dc99Sserge-sans-paille   int f;
6*f764dc99Sserge-sans-paille   int a[];
7*f764dc99Sserge-sans-paille };
test(t * s2)8*f764dc99Sserge-sans-paille void test(t *s2) {
9*f764dc99Sserge-sans-paille   s2->a[2] = 0; // no-warning
10*f764dc99Sserge-sans-paille }
11*f764dc99Sserge-sans-paille 
12*f764dc99Sserge-sans-paille // Under -fstrict-flex-arrays `a` is not a flexible array.
13*f764dc99Sserge-sans-paille struct t1 {
14*f764dc99Sserge-sans-paille   int f;
15*f764dc99Sserge-sans-paille   int a[1]; // expected-note {{array 'a' declared here}}
16*f764dc99Sserge-sans-paille };
test1(t1 * s2)17*f764dc99Sserge-sans-paille void test1(t1 *s2) {
18*f764dc99Sserge-sans-paille   s2->a[2] = 0; // expected-warning {{array index 2 is past the end of the array (which contains 1 element)}}
19*f764dc99Sserge-sans-paille }
20*f764dc99Sserge-sans-paille 
21*f764dc99Sserge-sans-paille // Under -fstrict-flex-arrays `a` is a flexible array.
22*f764dc99Sserge-sans-paille struct t2 {
23*f764dc99Sserge-sans-paille   int f;
24*f764dc99Sserge-sans-paille   int a[0];
25*f764dc99Sserge-sans-paille };
test1(t2 * s2)26*f764dc99Sserge-sans-paille void test1(t2 *s2) {
27*f764dc99Sserge-sans-paille   s2->a[2] = 0; // no-warning
28*f764dc99Sserge-sans-paille }
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