commit 80e9f65c040873c2aa016bfb0db5984e9db46f18
author Elliott Hughes <enh@google.com> Mon Oct 14 12:19:29 2019 -0700
committer Elliott Hughes <enh@google.com> Tue Oct 15 13:30:12 2019 -0700
tree 4999055583e9f535e4f514d1534834d7c47d074c
parent 95712059371aa522c80f1cab3cc3eb5431cc7f71

Remove __ANDROID_NDK__ from bionic, and document our #defines.

__ANDROID_NDK__ is moving into the NDK's <android/ndk-version.h>
instead.

Test: treehugger
Change-Id: I192016165a929547009d15dbcc30e8f6dad1ac88

libc/include/sys/cdefs.h

diff --git a/libc/include/sys/cdefs.h b/libc/include/sys/cdefs.h
index b061c22..8078bda 100644
--- a/libc/include/sys/cdefs.h
+++ b/libc/include/sys/cdefs.h
@@ -36,6 +36,10 @@
 
 #pragma once
 
+/**
+ * `__BIONIC__` is always defined if you're building with bionic. See
+ * https://android.googlesource.com/platform/bionic/+/master/docs/defines.md.
+ */
 #define __BIONIC__ 1
 
 #if defined(__cplusplus)