Compile error when using clang and precompiled headers

[DoDoENT]

In my Application.mk I've set NDK_TOOLCHAIN_VERSION=clang and in Android.mk I've defined LOCAL_PCH to point header I wish to get precompiled.

With GCC (NDK_TOOLCHAIN_VERSION unset), project can be built successfully. With clang I get following errors:

clang++: error: treating 'c-header' input as 'c++-header' when in C++ mode, this behavior is deprecated

[DoDoENT]

It appears this can be fixed by adding following line to $NDK_DIR/build/core/build-binary.mk:

Around line 440, below comment #Build PCH and above $(call compile-cpp-source,$(LOCAL_PCH),$(LOCAL_BUILT_PCH).gch) add this line:

LOCAL_SRC_FILES_TARGET_CFLAGS.$(LOCAL_PCH) += -x c++-header

[DanAlbert]

Thanks again! Added a test case and uploaded for review: https://android-review.googlesource.com/208223