Merge topic 'android-include-api'

1ee0ffab Android: Pass sysroot include directory explicitly
1806e011 Android: Fix c++_{static,shared} support include directory order

Modules/Platform/Android-Common.cmake

@@ -149,4 +149,13 @@ macro(__android_compiler_common lang)
   if("x${lang}" STREQUAL "xCXX")
     __android_stl(CXX)
   endif()
+
+  # <ndk>/build/core/definitions.mk appends the sysroot's include directory
+  # explicitly at the end of the command-line include path so that it
+  # precedes the toolchain's builtin include directories.  This is
+  # necessary so that Android API-version-specific headers are preferred
+  # over those in the toolchain's `include-fixed` directory (which cannot
+  # possibly match all versions).
+  list(APPEND CMAKE_${lang}_STANDARD_INCLUDE_DIRECTORIES "${CMAKE_SYSROOT}/usr/include")
+  list(REMOVE_ITEM CMAKE_${lang}_IMPLICIT_INCLUDE_DIRECTORIES "/usr/include")
 endmacro()

Modules/Platform/Android/ndk-stl-c++.cmake

@@ -6,16 +6,15 @@ macro(__android_stl_cxx lang filename)
   if(EXISTS "${CMAKE_ANDROID_NDK}/sources/cxx-stl/llvm-libc++/libcxx/include/cstddef")
     # r12 and below
     __android_stl_inc(${lang} "${CMAKE_ANDROID_NDK}/sources/cxx-stl/llvm-libc++/libcxx/include" 1)
+    __android_stl_inc(${lang} "${CMAKE_ANDROID_NDK}/sources/android/support/include" 0)
     __android_stl_inc(${lang} "${CMAKE_ANDROID_NDK}/sources/cxx-stl/llvm-libc++abi/libcxxabi/include" 1)
   else()
     # r13 and above
     __android_stl_inc(${lang} "${CMAKE_ANDROID_NDK}/sources/cxx-stl/llvm-libc++/include" 1)
+    __android_stl_inc(${lang} "${CMAKE_ANDROID_NDK}/sources/android/support/include" 0)
     __android_stl_inc(${lang} "${CMAKE_ANDROID_NDK}/sources/cxx-stl/llvm-libc++abi/include" 1)
   endif()
 
-  # Add a secondary include directory if it exists.
-  __android_stl_inc(${lang} "${CMAKE_ANDROID_NDK}/sources/android/support/include" 0)
-
   # Add the library file.
   __android_stl_lib(${lang} "${CMAKE_ANDROID_NDK}/sources/cxx-stl/llvm-libc++/libs/${CMAKE_ANDROID_ARCH_ABI}/${filename}" 1)
 endmacro()