[WIP NOT FOR COMMIT] Switch Android to libc++

build/config/compiler/BUILD.gn

Index: build/config/compiler/BUILD.gn
diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
index 088120dd4e246dad9f9ec16eb99727ea10083f2b..9556aa8752fc4a0e519a105596455cf9ec7acef6 100644
--- a/build/config/compiler/BUILD.gn
+++ b/build/config/compiler/BUILD.gn
@@ -452,7 +452,7 @@ config("runtime_library") {
     ]
   }
 
-  # Stlport setup. Android uses a different (smaller) version of the STL.
+  # Android setup.
   if (is_android) {
     if (is_clang) {
       # Work around incompatibilities between bionic and clang headers.
@@ -462,61 +462,40 @@ config("runtime_library") {
       ]
     }
 
-    defines += [
-      "USE_STLPORT=1",
-      "_STLP_USE_PTR_SPECIALIZATIONS=1",
-      "__GNU_SOURCE=1",  # Necessary for clone().
-    ]
+    defines += [ "__GNU_SOURCE=1" ] # Necessary for clone().
 
     ldflags += [
       "-Wl,--warn-shared-textrel",
       "-nostdlib",
     ]
 
-    # NOTE: The stlport header include paths below are specified in cflags
-    # rather than include_dirs because they need to come after include_dirs.
-    # Think of them like system headers, but don't use '-isystem' because the
-    # arm-linux-androideabi-4.4.3 toolchain (circa Gingerbread) will exhibit
-    # strange errors. The include ordering here is important; change with
-    # caution.
-    android_stlport_root = "$android_ndk_root/sources/cxx-stl/stlport"
+    # Libc++ setup.
+    android_libcpp_root = "$android_ndk_root/sources/cxx-stl/llvm-libc++"
 
     cflags += [
-      "-isystem" + rebase_path("$android_stlport_root/stlport",
-                               root_build_dir)
+      "-isystem" + rebase_path("$android_libcpp_root/libcxx/include",
+                               root_build_dir),
+      "-isystem" + rebase_path("$android_ndk_root/sources/cxx-stl/llvm-libc++abi/libcxxabi/include",
+                               root_build_dir),
+      "-isystem" + rebase_path("$android_ndk_root/sources/android/support/include",
+                               root_build_dir),
     ]
     if (arm_use_thumb) {
-      lib_dirs += [ "$android_stlport_root/libs/$android_app_abi/thumb" ]
-    } else {
-      lib_dirs += [ "$android_stlport_root/libs/$android_app_abi" ]
-    }
-
-    if (component_mode == "shared_library") {
-      libs += [ "stlport_shared" ]
-    } else {
-      libs += [ "stlport_static" ]
-    }
-
-    if (cpu_arch == "mipsel") {
-      libs += [
-        # ld linker is used for mips Android, and ld does not accept library
-        # absolute path prefixed by "-l"; Since libgcc does not exist in mips
-        # sysroot the proper library will be linked.
-        # TODO(gordanac): Remove once gold linker is used for mips Android.
-        "gcc",
-      ]
+      lib_dirs += [ "$android_libcpp_root/libs/$android_app_abi/thumb" ]
     } else {
-      libs += [
-        # Manually link the libgcc.a that the cross compiler uses. This is
-        # absolute because the linker will look inside the sysroot if it's not.
-        rebase_path(android_libgcc_file),
-      ]
+      lib_dirs += [ "$android_libcpp_root/libs/$android_app_abi" ]
     }
 
+    lib_dirs += [ "$android_libcpp_root/libs/$android_app_abi" ]
     libs += [
+      "$android_libcpp_library",
+      "atomic",
+      # Manually link the libgcc.a that the cross compiler uses. This is
+      # absolute because the linker will look inside the sysroot if it's not.
+      rebase_path(android_libgcc_file),
+      "m",
       "c",
       "dl",
-      "m",
     ]
 
   }