Revert "Switch NDK libc++ from prebuilts/ndk to prebuilts/clang"

Revert submission 3195358-ndk-libcxx

Reason for revert: Droidmonitor created revert due to b/356220894. Will be verifying through ABTD before submission.

Reverted changes: /q/submissionid:3195358-ndk-libcxx

Change-Id: If4bac6cca12a4c70bab22ffd310f262ef6f5fb78
diff --git a/core/binary.mk b/core/binary.mk
index 1e98bc0..0bc9469 100644
--- a/core/binary.mk
+++ b/core/binary.mk
@@ -205,6 +205,8 @@
     my_api_level := $(my_ndk_api)
   endif
 
+  my_ndk_source_root := \
+      $(HISTORICAL_NDK_VERSIONS_ROOT)/$(LOCAL_NDK_VERSION)/sources
   my_built_ndk := $(SOONG_OUT_DIR)/ndk
   my_ndk_triple := $($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_NDK_TRIPLE)
   my_ndk_sysroot_include := \
@@ -237,18 +239,16 @@
   endif
 
   ifeq (system,$(LOCAL_NDK_STL_VARIANT))
-    my_ndk_source_root := \
-        $(HISTORICAL_NDK_VERSIONS_ROOT)/$(LOCAL_NDK_VERSION)/sources
     my_ndk_stl_include_path := $(my_ndk_source_root)/cxx-stl/system/include
     my_system_shared_libraries += libstdc++
   else ifneq (,$(filter c++_%, $(LOCAL_NDK_STL_VARIANT)))
-    my_llvm_dir := $(LLVM_PREBUILTS_BASE)/$(BUILD_OS)-x86/$(LLVM_PREBUILTS_VERSION)
-    my_libcxx_arch_dir := $(my_llvm_dir)/android_libc++/ndk/$($(LOCAL_2ND_ARCH_VAR_PREFIX)PREBUILT_LIBCXX_ARCH_DIR)
+    my_ndk_stl_include_path := \
+      $(my_ndk_source_root)/cxx-stl/llvm-libc++/include
+    my_ndk_stl_include_path += \
+      $(my_ndk_source_root)/cxx-stl/llvm-libc++abi/include
 
-    # Include the target-specific __config_site file followed by the generic libc++ headers.
-    my_ndk_stl_include_path := $(my_libcxx_arch_dir)/include/c++/v1
-    my_ndk_stl_include_path += $(my_llvm_dir)/include/c++/v1
-    my_libcxx_libdir := $(my_libcxx_arch_dir)/lib
+    my_libcxx_libdir := \
+      $(my_ndk_source_root)/cxx-stl/llvm-libc++/libs/$(my_cpu_variant)
 
     ifeq (c++_static,$(LOCAL_NDK_STL_VARIANT))
       my_ndk_stl_static_lib := \
@@ -258,7 +258,7 @@
       my_ndk_stl_shared_lib_fullpath := $(my_libcxx_libdir)/libc++_shared.so
     endif
 
-    my_ndk_stl_static_lib += $($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_LIBUNWIND)
+    my_ndk_stl_static_lib += $(my_libcxx_libdir)/libunwind.a
     my_ldlibs += -ldl
   else # LOCAL_NDK_STL_VARIANT must be none
     # Do nothing.
diff --git a/core/clang/TARGET_arm.mk b/core/clang/TARGET_arm.mk
index 126482f..f18747a 100644
--- a/core/clang/TARGET_arm.mk
+++ b/core/clang/TARGET_arm.mk
@@ -4,10 +4,7 @@
 
 $(clang_2nd_arch_prefix)TARGET_LIBPROFILE_RT := $(LLVM_RTLIB_PATH)/libclang_rt.profile-arm-android.a
 $(clang_2nd_arch_prefix)TARGET_LIBCRT_BUILTINS := $(LLVM_RTLIB_PATH)/libclang_rt.builtins-arm-android.a
-$(clang_2nd_arch_prefix)TARGET_LIBUNWIND := $(LLVM_RTLIB_PATH)/arm/libunwind.a
 
 # Address sanitizer clang config
 $(clang_2nd_arch_prefix)ADDRESS_SANITIZER_LINKER := /system/bin/linker_asan
 $(clang_2nd_arch_prefix)ADDRESS_SANITIZER_LINKER_FILE := /system/bin/bootstrap/linker_asan
-
-$(clang_2nd_arch_prefix)PREBUILT_LIBCXX_ARCH_DIR := arm
diff --git a/core/clang/TARGET_arm64.mk b/core/clang/TARGET_arm64.mk
index e7ab6cb..42bed0a 100644
--- a/core/clang/TARGET_arm64.mk
+++ b/core/clang/TARGET_arm64.mk
@@ -4,10 +4,7 @@
 
 TARGET_LIBPROFILE_RT := $(LLVM_RTLIB_PATH)/libclang_rt.profile-aarch64-android.a
 TARGET_LIBCRT_BUILTINS := $(LLVM_RTLIB_PATH)/libclang_rt.builtins-aarch64-android.a
-TARGET_LIBUNWIND := $(LLVM_RTLIB_PATH)/aarch64/libunwind.a
 
 # Address sanitizer clang config
 ADDRESS_SANITIZER_LINKER := /system/bin/linker_asan64
 ADDRESS_SANITIZER_LINKER_FILE := /system/bin/bootstrap/linker_asan64
-
-PREBUILT_LIBCXX_ARCH_DIR := aarch64
diff --git a/core/clang/TARGET_riscv64.mk b/core/clang/TARGET_riscv64.mk
index 58c9c7b..cfb5c7d 100644
--- a/core/clang/TARGET_riscv64.mk
+++ b/core/clang/TARGET_riscv64.mk
@@ -4,10 +4,7 @@
 
 TARGET_LIBPROFILE_RT := $(LLVM_RTLIB_PATH)/libclang_rt.profile-riscv64-android.a
 TARGET_LIBCRT_BUILTINS := $(LLVM_RTLIB_PATH)/libclang_rt.builtins-riscv64-android.a
-TARGET_LIBUNWIND := $(LLVM_RTLIB_PATH)/riscv64/libunwind.a
 
 # Address sanitizer clang config
 ADDRESS_SANITIZER_LINKER := /system/bin/linker_asan64
 ADDRESS_SANITIZER_LINKER_FILE := /system/bin/bootstrap/linker_asan64
-
-PREBUILT_LIBCXX_ARCH_DIR := riscv64
diff --git a/core/clang/TARGET_x86.mk b/core/clang/TARGET_x86.mk
index 1a08c79..5491a05 100644
--- a/core/clang/TARGET_x86.mk
+++ b/core/clang/TARGET_x86.mk
@@ -4,10 +4,7 @@
 
 $(clang_2nd_arch_prefix)TARGET_LIBPROFILE_RT := $(LLVM_RTLIB_PATH)/libclang_rt.profile-i686-android.a
 $(clang_2nd_arch_prefix)TARGET_LIBCRT_BUILTINS := $(LLVM_RTLIB_PATH)/libclang_rt.builtins-i686-android.a
-$(clang_2nd_arch_prefix)TARGET_LIBUNWIND := $(LLVM_RTLIB_PATH)/i386/libunwind.a
 
 # Address sanitizer clang config
 $(clang_2nd_arch_prefix)ADDRESS_SANITIZER_LINKER := /system/bin/linker_asan
 $(clang_2nd_arch_prefix)ADDRESS_SANITIZER_LINKER_FILE := /system/bin/bootstrap/linker_asan
-
-$(clang_2nd_arch_prefix)PREBUILT_LIBCXX_ARCH_DIR := i386
diff --git a/core/clang/TARGET_x86_64.mk b/core/clang/TARGET_x86_64.mk
index f39b41e..167db72 100644
--- a/core/clang/TARGET_x86_64.mk
+++ b/core/clang/TARGET_x86_64.mk
@@ -4,10 +4,7 @@
 
 TARGET_LIBPROFILE_RT := $(LLVM_RTLIB_PATH)/libclang_rt.profile-x86_64-android.a
 TARGET_LIBCRT_BUILTINS := $(LLVM_RTLIB_PATH)/libclang_rt.builtins-x86_64-android.a
-TARGET_LIBUNWIND := $(LLVM_RTLIB_PATH)/x86_64/libunwind.a
 
 # Address sanitizer clang config
 ADDRESS_SANITIZER_LINKER := /system/bin/linker_asan64
 ADDRESS_SANITIZER_LINKER_FILE := /system/bin/bootstrap/linker_asan64
-
-PREBUILT_LIBCXX_ARCH_DIR := x86_64
diff --git a/core/install_jni_libs_internal.mk b/core/install_jni_libs_internal.mk
index 4959edd..5491247 100644
--- a/core/install_jni_libs_internal.mk
+++ b/core/install_jni_libs_internal.mk
@@ -38,9 +38,8 @@
       $(error LOCAL_SDK_VERSION must be defined with LOCAL_NDK_STL_VARIANT, \
           LOCAL_PACKAGE_NAME=$(LOCAL_PACKAGE_NAME))
     endif
-    my_libcxx_arch := $($(LOCAL_2ND_ARCH_VAR_PREFIX)PREBUILT_LIBCXX_ARCH_DIR)
     my_jni_shared_libraries += \
-        $(LLVM_PREBUILTS_BASE)/$(BUILD_OS)-x86/$(LLVM_PREBUILTS_VERSION)/android_libc++/ndk/$(my_libcxx_arch)/lib/libc++_shared.so
+        $(HISTORICAL_NDK_VERSIONS_ROOT)/$(LOCAL_NDK_VERSION)/sources/cxx-stl/llvm-libc++/libs/$(TARGET_$(my_2nd_arch_prefix)CPU_ABI)/libc++_shared.so
   endif
 
   # Set the abi directory used by the local JNI shared libraries.