[RFC v2 1/3] cdefs: Add __bool

[Alejandro Colomar]

Signed-off-by: Alejandro Colomar <alx@kernel.org>
---
 misc/sys/cdefs.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/misc/sys/cdefs.h b/misc/sys/cdefs.h
index 215ff937ee..1cd8f1e85b 100644
--- a/misc/sys/cdefs.h
+++ b/misc/sys/cdefs.h
@@ -57,6 +57,18 @@
 # define __glibc_has_extension(ext) 0
 #endif
 
+#if defined __cplusplus
+# define __bool   bool
+#elif defined __GNUC__ || defined __clang__
+# if __GNUC_PREREQ (3, 0)
+#  define __bool  _Bool
+# else
+#  define __bool  int
+# endif
+#else
+# define __bool  _Bool
+#endif
+
 #if defined __GNUC__ || defined __clang__
 
 /* All functions, except those with callbacks or those that
-- 
2.50.1