[Android] Roll to NDK r12b.

build/config/android/BUILD.gn

Index: build/config/android/BUILD.gn
diff --git a/build/config/android/BUILD.gn b/build/config/android/BUILD.gn
index 8343861ab103a02cec8cde5e940b3994a2098f62..f8c78d61a2b51227fa372b782718b17b4b494732 100644
--- a/build/config/android/BUILD.gn
+++ b/build/config/android/BUILD.gn
@@ -114,13 +114,7 @@ config("runtime_library") {
   lib_dirs = [ android_libcpp_lib_dir ]
 
   # The libc++ runtime library (must come first).
-  # ASan needs to dynamically link to libc++ even in static builds so
-  # that it can interpose operator new.
-  if (is_component_build || is_asan) {
-    libs = [ "c++_shared" ]
-  } else {
-    libs = [ "c++_static" ]
-  }
+  libs = [ "c++" ]

[agrieve, 2016/09/03 00:22:01]

curious why this is safe to change?

[jbudorick, 2016/09/03 18:41:01]

Turns out it isn't :(

r12 seems to have split the contents of libc++_static.a and libc++_shared.so,
and it brought in
https://chromium.googlesource.com/android_ndk/+/master/sources/cxx-stl/llvm-l...
and
https://chromium.googlesource.com/android_ndk/+/master/sources/cxx-stl/llvm-l...
to support that. I was hoping to use those (and was able to successfully build
with them), but doing this meant that -lc++ always dynamically linked libc++.so
(even in non-component builds).

 
   # Manually link the libgcc.a that the cross compiler uses. This is
   # absolute because the linker will look inside the sysroot if it's not.