From a2c1e37ed40a346e8d340345fb9fcf390a4981fb Mon Sep 17 00:00:00 2001
From: Matthias Ringwald <matthias@ringwald.ch>
Date: Thu, 28 Apr 2022 16:47:39 +0200
Subject: [PATCH] btstack_bool: fix warning

---
 src/btstack_bool.h | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/btstack_bool.h b/src/btstack_bool.h
index dd81666bc..89f2c88ff 100644
--- a/src/btstack_bool.h
+++ b/src/btstack_bool.h
@@ -65,10 +65,16 @@
 
 #else /* PREDEF_STANDARD_C_1999 */
 
-// backport for pre-c99 compilers
+// backport for pre-c99 compilers or incorrect detection
+#ifndef bool
 #define bool unsigned char
+#endif
+#ifndef false
 #define false 0
+#endif
+#ifndef true
 #define true 1
+#endif
 
 #endif /* PREDEF_STANDARD_C_1999 */