Missing Isnan()/isnanf() When Linking With NDK R11.

Hi all,
We're noticing a regression moving to NDK r11. Linking of a project that 
refers to isnan() and isnanf() fails. The same code compiled and linked 
with NDK r10e works fine.
Example of errors:
jni/../../../android/obj/local/armeabi/libosgUtil.a(CullVisitor.o):/opt/OpenSceneGraph/Android/osg-git-android/src/osgUtil/CullVisitor.cpp:function 
osgUtil::CullVisitor::apply(osg::Geode&): error: undefined reference to 
'isnanf'
jni/../../../android/obj/local/armeabi/libosgUtil.a(CullVisitor.o):/opt/OpenSceneGraph/Android/osg-git-android/src/osgUtil/CullVisitor.cpp:function 
osgUtil::CullVisitor::apply(osg::Billboard&): error: undefined reference to 
'isnanf'
jni/../../../android/obj/local/armeabi/libosgUtil.a(IntersectVisitor.o):/opt/OpenSceneGraph/Android/osg-git-android/src/osgUtil/IntersectVisitor.cpp:function 
osg::LineSegment::valid() const: error: undefined reference to 'isnan'
Our Android.mk includes:
APP_STL := c++_shared
APP_CPPFLAGS := -frtti -fexceptions
NDK_TOOLCHAIN_VERSION := clang
A couple of tests show that the linker is looking for the undecorated isnan 
and isnanf symbols, and that these should are found in libc.so, which 
should automatically be linked as a dependency of libc++_shared.so
$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-nm 
-g ../../android/obj/local/armeabi/libosgUtil.a | grep isnan
         U isnanf
         U isnan
$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-nm 
-gD $NDK/android-ndk/platforms/android-21/arch-arm/usr/lib/libc.so | grep 
isnan
0000a96c T __isnan
0000a980 T __isnanf
0000a994 T __isnanl
0000ccbc T isnan
0000ccd0 T isnanf
0000cce4 T isnanl
$NDK/ndk-depends 
/opt/OpenSceneGraph/Android/osg-git-android/build/osg-root/obj/local/armeabi/libc++_shared.so 
libc++_shared.so
libm.so
libdl.so
libc.so
I'm a bit stumped as to why this won't link. I've tried explicitly adding 
-lc to my LOCAL_LDLIBS, but it makes no difference.
Regards,
Phil.
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