Add our LP32 ABI defects to the readme.
Change-Id: Id77a3dbf6b91243c57528ed86ca24100d8795907
diff --git a/README.md b/README.md
index a031fbc..5e9587d 100644
--- a/README.md
+++ b/README.md
@@ -256,3 +256,20 @@
$ genhtml -o covreport coverage.info # or lcov --list coverage.info
The coverage report is now available at `covreport/index.html`.
+
+
+LP32 ABI bugs
+-------------
+
+This probably belongs in the NDK documentation rather than here, but these
+are the known ABI bugs in LP32:
+
+ * time_t is 32-bit. http://b/5819737
+
+ * off_t is 32-bit. There is off64_t, but no _FILE_OFFSET_BITS support.
+ Many of the off64_t functions are missing in older releases, and
+ stdio uses 32-bit offsets, so there's no way to fully implement
+ _FILE_OFFSET_BITS.
+
+ * sigset_t is too small on ARM and x86 (but correct on MIPS), so support
+ for real-time signals is broken. http://b/5828899
