Improve the _FILE_OFFSET_BITS docs and link to them.
We're still seeing lots of confusion. People do seem to look as far as
the headers, but stop there. So let's try a bit harder to point them in
the right direction.
Also explicitly state that removing _FILE_OFFSET_BITS=64 is the
behavior-preserving fix for compilation problems when upgrading to NDK
r15 or later.
Bug: N/A
Test: N/A
Change-Id: I2d5c65b2fb5cccb9977901e51fea1ad2ccc0fd95
diff --git a/libc/include/sys/sendfile.h b/libc/include/sys/sendfile.h
index ecdb76c..97432c0 100644
--- a/libc/include/sys/sendfile.h
+++ b/libc/include/sys/sendfile.h
@@ -34,6 +34,7 @@
__BEGIN_DECLS
+/* See https://android.googlesource.com/platform/bionic/+/master/docs/32-bit-abi.md */
#if defined(__USE_FILE_OFFSET64)
ssize_t sendfile(int __out_fd, int __in_fd, off_t* __offset, size_t __count) __RENAME(sendfile64) __INTRODUCED_IN(21);
#else