Use std::filesystem when libc++ is new enough
_LIBCPP_VERSION in external/libcxx is 8000. When _LIBCPP_VERSION is
newer, assume it's the new libc++ toolchain prebuilt, which has a
finalized std::filesystem, and use std::filesystem instead. To make
Soong happy, keep the android.hardware.automotive@libc++fs library for
now but stub out the C++ source files and make the
android::hardware::automotive::filesystem namespace an alias for
std::filesystem.
Bug: 152067309
Bug: 175635923
Test: treehugger
Test: m android.hardware.automotive.can@1.0-service
Test: m android.hardware.automotive@libc++fs
Change-Id: I7aede74cda0122434d972a075d7c7a9933845450
diff --git a/automotive/can/1.0/default/libc++fs/include/automotive/filesystem b/automotive/can/1.0/default/libc++fs/include/automotive/filesystem
index 660ad09..bd3dda5 100644
--- a/automotive/can/1.0/default/libc++fs/include/automotive/filesystem
+++ b/automotive/can/1.0/default/libc++fs/include/automotive/filesystem
@@ -9,6 +9,18 @@
//===----------------------------------------------------------------------===//
#ifndef _LIBAUTO_FILESYSTEM
#define _LIBAUTO_FILESYSTEM
+
+// TODO(152067309): Remove this once the libc++ upgrade is complete.
+#include <__config>
+#if defined(_LIBCPP_VERSION) && _LIBCPP_VERSION > 8000
+
+#include <filesystem>
+namespace android::hardware::automotive {
+namespace filesystem = std::filesystem;
+}
+
+#else
+
/*
filesystem synopsis
@@ -2696,4 +2708,6 @@
_LIBCPP_POP_MACROS
+#endif // defined(_LIBCPP_VERSION) && _LIBCPP_VERSION > 8000
+
#endif // _LIBAUTO_FILESYSTEM
diff --git a/automotive/can/1.0/default/libc++fs/src/filesystem/directory_iterator.cpp b/automotive/can/1.0/default/libc++fs/src/filesystem/directory_iterator.cpp
index 37c863b..0dbf492 100644
--- a/automotive/can/1.0/default/libc++fs/src/filesystem/directory_iterator.cpp
+++ b/automotive/can/1.0/default/libc++fs/src/filesystem/directory_iterator.cpp
@@ -6,9 +6,15 @@
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
+
+// TODO(152067309): Remove this once the libc++ upgrade is complete.
+#include <__config>
+#if defined(_LIBCPP_VERSION) && _LIBCPP_VERSION <= 8000
+
/* clang-format off */
#include "automotive/filesystem"
#include <__config>
+
#if defined(_LIBCPP_WIN32API)
#define WIN32_LEAN_AND_MEAN
#include <Windows.h>
@@ -395,3 +401,5 @@
} // namespace android::hardware::automotive::filesystem
/* clang-format on */
+
+#endif // defined(_LIBCPP_VERSION) && _LIBCPP_VERSION <= 8000
diff --git a/automotive/can/1.0/default/libc++fs/src/filesystem/operations.cpp b/automotive/can/1.0/default/libc++fs/src/filesystem/operations.cpp
index 404c0bd..6a76bdc 100644
--- a/automotive/can/1.0/default/libc++fs/src/filesystem/operations.cpp
+++ b/automotive/can/1.0/default/libc++fs/src/filesystem/operations.cpp
@@ -6,6 +6,11 @@
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
+
+// TODO(152067309): Remove this once the libc++ upgrade is complete.
+#include <__config>
+#if defined(_LIBCPP_VERSION) && _LIBCPP_VERSION <= 8000
+
/* clang-format off */
#include "automotive/filesystem"
#include <array>
@@ -1771,3 +1776,5 @@
#endif
} // namespace android::hardware::automotive::filesystem
/* clang-format on */
+
+#endif // defined(_LIBCPP_VERSION) && _LIBCPP_VERSION <= 8000