From: Aydın Mercan <aydin@isc.org>
Date: Tue, 3 Feb 2026 07:56:00 +0000 (+0300)
Subject: add types compatible builtin
X-Git-Url: http://git.ipfire.org/gitweb/?a=commitdiff_plain;h=0eacec592a2f6775298e529674968e8f06eff891;p=thirdparty%2Fbind9.git

add types compatible builtin

This builtin function makes macros gain type safety and also the ability
to statically assert the correctness of typedefs that target external
libraries.
---

diff --git a/lib/isc/include/isc/util.h b/lib/isc/include/isc/util.h
index 43026a01ef4..ddfce87c324 100644
--- a/lib/isc/include/isc/util.h
+++ b/lib/isc/include/isc/util.h
@@ -39,6 +39,10 @@
 #define __has_header(x) 0
 #endif
 
+#ifndef __has_builtin
+#define __has_builtin(x) 0
+#endif
+
 /***
  *** General Macros.
  ***/
@@ -303,3 +307,9 @@ mock_assert(const int result, const char *const expression,
 		a = b;                    \
 		b = __tmp_swap;           \
 	}
+
+#if __has_builtin(__builtin_types_compatible_p)
+#define ISC_TYPES_COMPATIBLE(x, y) __builtin_types_compatible_p(x, y)
+#else /* __has_builtin(__builtin_types_compatible_p) */
+#define ISC_TYPES_COMPATIBLE(x, y) 1
+#endif /* __has_builtin(__builtin_types_compatible_p) */