Build support and abstractions for Linux build

This has a large number of fixes to build on Linux/ChromeOS. In general,
it is making sure the BUILD.gn and Android.bp for a directory structure
match and it has all the configs + deps needed to build.

Besides a number of simple fixups (missing headers), there are also
a few abstractions that need to be noted:

* All of audio HAL is stubbed out (using the host implementation)
* Parameter provider and system_properties (under gd/os) now have
  a linux variant that changes where configuration files are kept. The
  current location for linux is now /etc/systembt. This implementation
  was copied from the host versions (which seems to be used for host
  testing).

Bug: 176847256
Tag: #floss
Test: atest --host bluetooth_test_gd
Change-Id: I1a6b3b362cedbe5f675794a115a330cc7f85f9c1

Author: apandit

BUILD.gn

@@ -21,14 +21,10 @@
 # file to your new one or GN won't know about it.
 
 group("all") {
-  deps = [
-    ":bluetooth",
-  ]
+  deps = [ ":bluetooth" ]
 
   if (use.test) {
-    deps += [
-      ":bluetooth_tests"
-    ]
+    deps += [ ":bluetooth_tests" ]
   }
 }
 
@@ -43,24 +39,34 @@ group("bluetooth") {
 if (use.test) {
   group("bluetooth_tests") {
     deps = [
+      "//bt/btcore:net_test_btcore",
       "//bt/common:bluetooth_test_common",
-      "//bt/service:bluetoothtbd_test",
       "//bt/profile/avrcp:net_test_avrcp",
-      "//bt/btcore:net_test_btcore",
-      "//bt/types:net_test_types",
+      "//bt/service:bluetoothtbd_test",
       "//bt/stack:net_test_btm_iso",
+      "//bt/types:net_test_types",
+
       #"//bt/packet:net_test_btpackets",
     ]
   }
 }
 
+if (host_cpu == target_cpu && host_os == target_os) {
+  group("tools") {
+    deps = [
+      "//bt/gd/dumpsys/bundler:bluetooth_flatbuffer_bundler",
+      "//bt/gd/packet/parser:bluetooth_packetgen",
+    ]
+  }
+}
+
 if (defined(use.android) && use.android) {
   group("android_bluetooth_tests") {
     deps = [
-      "//bt/test/suite:net_test_bluetooth",
+      "//bt/device:net_test_device",
       "//bt/hci:net_test_hci",
       "//bt/osi:net_test_osi",
-      "//bt/device:net_test_device",
+      "//bt/test/suite:net_test_bluetooth",
     ]
   }
 }
@@ -71,11 +77,13 @@ config("target_defaults") {
     "//bt/linux_include",
     "//bt/types",
     "//bt/include",
+
+    # For flatbuffer generated headers
+    "${root_gen_dir}/bt/gd/",
+    "${root_gen_dir}/bt/gd/dumpsys/bundler",
   ]
 
   cflags = [
-    "-DEXPORT_SYMBOL=__attribute__((visibility(\"default\")))",
-    "-DFALLTHROUGH_INTENDED=[[clang::fallthrough]]",
     "-fPIC",
     "-Wno-non-c-typedef-for-linkage",
     "-Wno-unreachable-code-return",
@@ -91,20 +99,26 @@ config("target_defaults") {
     "-Wno-unused-variable",
     "-Wno-unused-const-variable",
     "-Wno-format",
+    "-Wno-pessimizing-move",
+    "-Wno-unknown-warning-option",
+    "-Wno-final-dtor-non-final-class",
   ]
 
-  cflags_cc = [
-    "-std=c++17",
-  ]
+  cflags_cc = [ "-std=c++17" ]
 
   defines = [
     "HAS_NO_BDROID_BUILDCFG",
     "OS_GENERIC",
+    "OS_LINUX_GENERIC",
+    "EXPORT_SYMBOL=__attribute__((visibility(\"default\")))",
+    "FALLTHROUGH_INTENDED=[[clang::fallthrough]]",
   ]
 
-  configs = [
-    ":external_libchrome",
-  ]
+  if (!(defined(use.bt_nonstandard_codecs) && use.bt_nonstandard_codecs)) {
+    defines += [ "EXCLUDE_NONSTANDARD_CODECS" ]
+  }
+
+  configs = [ ":external_libchrome" ]
 }
 
 # Configurations to use as dependencies for GN build
@@ -135,6 +149,12 @@ config("external_tinyxml2") {
   configs = [ ":pkg_tinyxml2" ]
 }
 
+config("external_flatbuffers") {
+  lib_dirs = [ "${libdir}" ]
+
+  libs = [ "flatbuffers" ]
+}
+
 # Package configurations to extract dependencies from env
 pkg_config("pkg_gtest") {
   pkg_deps = [ "gtest" ]
@@ -184,10 +204,10 @@ if (defined(use.bt_nonstandard_codecs) && use.bt_nonstandard_codecs) {
   }
 
   pkg_config("pkg_libldacBT_enc") {
-    pkg_deps = [ "ldacBT-enc", ]
+    pkg_deps = [ "ldacBT-enc" ]
   }
 
   pkg_config("pkg_libldacBT_abr") {
-    pkg_deps = [ "ldacBT-abr", ]
+    pkg_deps = [ "ldacBT-abr" ]
   }
 }

system/audio_hal_interface/BUILD.gn

@@ -0,0 +1,36 @@
+#
+#  Copyright 2021 Google, Inc.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at:
+#
+#  http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#
+
+static_library("audio_hal_interface") {
+  sources = [
+    "a2dp_encoding_host.cc",
+    "hearing_aid_software_encoding_host.cc",
+  ]
+
+  include_dirs = [
+    "//bt/bta/include",
+    "//bt/btif/include",
+    "//bt/stack/include",
+    "//bt/gd/rust/shim",
+  ]
+
+  configs += [ "//bt:target_defaults" ]
+
+  deps = [
+    "//bt/common",
+    "//bt/osi:osi",
+  ]
+}

system/bta/include/bta_hearing_aid_api.h

@@ -22,6 +22,7 @@
 #include <hardware/bt_hearing_aid.h>
 #include <cstdint>
 #include <deque>
+#include <functional>
 #include <vector>
 
 constexpr uint16_t HEARINGAID_MAX_NUM_UUIDS = 1;

system/btcore/BUILD.gn

@@ -19,18 +19,16 @@ static_library("btcore") {
     "src/device_class.cc",
     "src/hal_util.cc",
     "src/module.cc",
-    "src/property.cc",
     "src/osi_module.cc",
+    "src/property.cc",
   ]
 
   include_dirs = [
     "include",
     "//bt",
   ]
 
-  configs += [
-    "//bt:target_defaults",
-  ]
+  configs += [ "//bt:target_defaults" ]
 
   deps = [
     "//bt/gd/rust/shim:init_flags_bridge_header",
@@ -41,9 +39,9 @@ static_library("btcore") {
 if (use.test) {
   executable("net_test_btcore") {
     sources = [
+      "//bt/osi/test/AllocationTestHarness.cc",
       "test/device_class_test.cc",
       "test/property_test.cc",
-      "//bt/osi/test/AllocationTestHarness.cc",
     ]
 
     include_dirs = [

system/btif/BUILD.gn

@@ -16,18 +16,36 @@
 
 static_library("btif") {
   sources = [
+    # TODO(abps) - Do we need this?
     "//bt/audio_a2dp_hw/src/audio_a2dp_hw_utils.cc",
     "//bt/audio_hearing_aid_hw/src/audio_hearing_aid_hw_utils.cc",
+
+    # AVRCP Target Service
     "avrcp/avrcp_service.cc",
+    "co/bta_av_co.cc",
+
+    # Callouts
+    "co/bta_dm_co.cc",
+    "co/bta_gatts_co.cc",
+    "co/bta_hh_co.cc",
+    "co/bta_pan_co.cc",
+
+    # HAL layer
+    "src/bluetooth.cc",
+
+    # BTIF implementation
     "src/btif_a2dp.cc",
+
+    # "TODO(abps) - Move this abstraction elsewhere
+    # "src/btif_a2dp_audio_interface.cc",
     "src/btif_a2dp_audio_interface_linux.cc",
     "src/btif_a2dp_control.cc",
     "src/btif_a2dp_sink.cc",
-    # "src/btif_a2dp_source.cc",
+    "src/btif_a2dp_source.cc",
     "src/btif_av.cc",
 
-    #TODO(jpawlowski): heavily depends on Android,
-    #   "src/btif_avrcp_audio_track.cc",
+    # TODO(abps) - Move this abstraction elsewhere
+    # "src/btif_avrcp_audio_track.cc",
     "src/btif_avrcp_audio_track_linux.cc",
     "src/btif_ble_advertiser.cc",
     "src/btif_ble_scanner.cc",
@@ -70,15 +88,6 @@ static_library("btif") {
     "src/stack_manager.cc",
   ]
 
-  # BTIF callouts
-  sources += [
-    "co/bta_av_co.cc",
-    "co/bta_dm_co.cc",
-    "co/bta_gatts_co.cc",
-    "co/bta_hh_co.cc",
-    "co/bta_pan_co.cc",
-  ]
-
   include_dirs = [
     "include",
     "//bt/",

system/common/BUILD.gn

@@ -17,10 +17,11 @@
 static_library("common") {
   sources = [
     "address_obfuscator.cc",
-    "once_timer.cc",
     "message_loop_thread.cc",
     "metric_id_allocator.cc",
     "metrics_linux.cc",
+    "once_timer.cc",
+    "os_utils.cc",
     "repeating_timer.cc",
     "time_util.cc",
   ]
@@ -37,9 +38,7 @@ static_library("common") {
     "//bt/third_party/proto_logging/stats:libbt-platform-protos",
   ]
 
-  configs += [
-    "//bt:target_defaults",
-  ]
+  configs += [ "//bt:target_defaults" ]
 }
 
 if (use.test) {
@@ -55,9 +54,7 @@ if (use.test) {
       "//bt/common",
     ]
 
-    deps = [
-      "//bt/common",
-    ]
+    deps = [ "//bt/common" ]
 
     configs += [
       "//bt:external_gtest_main",

system/embdrv/g722/BUILD.gn

@@ -19,4 +19,7 @@ static_library("g722") {
     "g722_decode.cc",
     "g722_encode.cc",
   ]
+
+  defines = [ "G722_SUPPORT_MALLOC" ]
+  configs += [ "//bt:target_defaults" ]
 }

system/gd/Android.bp

@@ -23,7 +23,6 @@ cc_defaults {
         },
         host: {
             cflags: [
-                "-DOS_LINUX",
                 "-DOS_LINUX_GENERIC",
             ],
         },