39 lines · c
1/* RUN: %clang_cc1 -std=c89 -verify=expected,c89only -pedantic -Wno-c11-extensions %s2 RUN: %clang_cc1 -std=c99 -verify=expected -pedantic -Wno-c11-extensions %s3 RUN: %clang_cc1 -std=c11 -verify=expected -pedantic %s4 RUN: %clang_cc1 -std=c17 -verify=expected -pedantic %s5 RUN: %clang_cc1 -std=c2x -verify=expected -pedantic %s6 */7 8/* WG14 DR502:9 * Flexible array member in an anonymous struct10 */11void dr502(void) {12 /* This is EXAMPLE 3 from 6.7.2.1 and is intended to show that a flexible13 * array member can be used when the only other members of the class are from14 * an anonymous structure member.15 */16 struct s {17 struct { int i; };18 int a[]; /* c89only-warning {{flexible array members are a C99 feature}} */19 };20 21 /* This is a slightly modified example that looks to see whether the22 * anonymous structure itself can provide a flexible array member for the23 * containing class.24 *25 * The committee does not think this is valid because it would mean the26 * anonymous structure would have size 0. Additionally, the anonymous27 * structure has no additional members and so the flexible array member is28 * not valid within the anonymous structure.29 */30 struct t {31 int i;32 struct { int a[]; }; /* expected-warning {{flexible array member 'a' in otherwise empty struct is a GNU extension}}33 c89only-warning {{flexible array members are a C99 feature}}34 expected-warning {{'' may not be nested in a struct due to flexible array member}}35 */36 };37}38 39