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Skip definition of bool on -std=c23 or newer
https://bugs.gentoo.org/970613
https://src.fedoraproject.org/rpms/ldns/blob/ee1ebc36cd4e1fdc81b9c43f1107c02e0cceb74e/f/ldns-1.9-std23-bool.patch
From: Petr Menšík <pemensik@redhat.com>
--- a/ldns/common.h.in
+++ b/ldns/common.h.in
@@ -40,6 +40,10 @@
*/
/*@ignore@*/
/* splint barfs on this construct */
+#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L)
+/* c23 defines bool already and deprecates stdbool.h */
+#define __bool_true_false_are_defined
+#endif
#ifndef __bool_true_false_are_defined
# ifdef HAVE_STDBOOL_H
# include <stdbool.h>
@@ -47,6 +51,8 @@
# ifndef HAVE__BOOL
# ifdef __cplusplus
typedef bool _Bool;
+# elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
+/* _Bool is a built-in keyword since C99; no macro definition needed. */
# else
# define _Bool signed char
# endif
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