/* $NetBSD: gcc_init_compound_literal.c,v 1.6 2022/06/17 18:54:53 rillig Exp $ */ # 3 "gcc_init_compound_literal.c" /* * C99 says in 6.7.8p4: * * All the expressions in an initializer for an object that has static * storage duration shall be constant expressions or string literals. * * The term "constant expression" is defined in C99 6.6, where 6.6p9 allows * "constant expressions" in initializers to also be an "address constant". * Using these address constants, it is possible to reference an unnamed * object created by a compound literal (C99 6.5.2.5), using either an * explicit '&' or the implicit array-to-pointer conversion from C99 6.3.2.1. * * Before init.c 1.195 from 2021-04-17, lint failed with an assertion failure * in check_global_variable, called by check_global_symbols since these * temporary objects have neither storage class EXTERN nor STATIC. */ // Seen in sys/crypto/aes/aes_ccm.c. const struct { const unsigned char *ctxt; } T = { .ctxt = (const unsigned char[4]){ 1, 2, 3, 4 }, }; struct node { int num; struct node *left; struct node *right; }; /* * Initial tree for representing the decisions in the classic number guessing * game often used in teaching the basics of programming. */ /* expect+1: warning: static variable 'guess' unused [226] */ static const struct node guess = { 50, &(struct node){ 25, &(struct node){ 12, (void *)0, (void *)0, }, &(struct node){ 37, (void *)0, (void *)0, }, }, (void *)0 };