Support building CHIP with GN

.github/workflows/gn_build.yaml

@@ -0,0 +1,48 @@
+name: GN Builds
+
+on:
+    push:
+    pull_request:
+
+jobs:
+    build:
+        name: GN Build
+
+        strategy:
+            matrix:
+                type: [main, clang, mbedtls]
+        env:
+            BUILD_TYPE: ${{ matrix.type }}
+            BUILD_VERSION: 0.2.14
+            BUILD_IMAGE: chip-build-openssl
+            BUILD_ORG: connectedhomeip
+
+        runs-on: ubuntu-latest
+
+        container:
+            image: "connectedhomeip/chip-build-openssl:0.2.14"
+            volumes:
+                - "/tmp/log_output:/tmp/test_logs"
+
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v2
+            - name: Checkout Submodules
+              run: make -f Makefile-bootstrap repos
+            - name: Bootstrap
+              run: scripts/build/gn_bootstrap.sh
+            - name: Setup Build
+              run: |
+                  case $BUILD_TYPE in
+                     "main") GN_ARGS='';;
+                     "clang") GN_ARGS='is_clang=true';;
+                     "linux-embedded") GN_ARGS='device_platform="linux"';;
+                     "mbedtls") GN_ARGS='chip_crypto="mbedtls"';;
+                     *) ;;
+                  esac
+
+                  scripts/build/gn_gen.sh --args="$GN_ARGS"
+            - name: Run Build
+              run: scripts/build/gn_build.sh
+            - name: Run Tests
+              run: scripts/tests/gn_tests.sh

.gitignore

@@ -20,6 +20,9 @@ configure
 src/include/BuildConfig.h.in
 src/include/BuildConfig.h.in~
 
+# GN build system
+out/
+
 # Repos stuff
 .repos-warning-stamp
 

.gn

@@ -0,0 +1,28 @@
+# Copyright (c) 2020 Project CHIP Authors
+#
+# 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.
+
+# The location of the build configuration file.
+buildconfig = "//build/config/BUILDCONFIG.gn"
+
+# CHIP uses angle bracket includes.
+check_system_includes = true
+
+# Allow loading paths relative to //gn.
+secondary_source = "//gn/"
+
+import("//gn/build_overrides/pigweed.gni")
+
+default_args = {
+  pw_unit_test_AUTOMATIC_RUNNER = "$dir_pigweed/targets/host/run_test"
+}

BUILD.gn

@@ -0,0 +1,163 @@
+# Copyright (c) 2020 Project CHIP Authors
+#
+# 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.
+
+import("//build_overrides/chip.gni")
+import("//build_overrides/mbedtls.gni")
+import("//build_overrides/nlassert.gni")
+import("//build_overrides/nlio.gni")
+import("//build_overrides/nlunit_test.gni")
+import("//build_overrides/pigweed.gni")
+
+# This build file should not be used in superproject builds.
+assert(chip_root == "//")
+
+import("//build/tests.gni")
+import("//build/tools.gni")
+
+if (current_toolchain != "${dir_pw_toolchain}/dummy:dummy") {
+  # This is a real toolchain. Build CHIP.
+  group("default") {
+    deps = [ ":all" ]
+  }
+
+  group("all") {
+    deps = [
+      "${chip_root}/src/app",
+      "${chip_root}/src/ble",
+      "${chip_root}/src/controller",
+      "${chip_root}/src/crypto",
+      "${chip_root}/src/inet",
+      "${chip_root}/src/lib",
+      "${chip_root}/src/lib/core",
+      "${chip_root}/src/lib/support",
+      "${chip_root}/src/lwip:all",
+      "${chip_root}/src/system",
+      "${chip_root}/src/transport",
+      "${mbedtls_root}:mbedtls",
+      "${nlassert_root}:nlassert",
+      "${nlio_root}:nlio",
+      "${nlunit_test_root}:nlunit-test",
+    ]
+
+    if (chip_build_tests) {
+      deps += [ ":tests" ]
+    }
+
+    if (chip_build_tools) {
+      deps += [
+        "${chip_root}/examples/chip-tool",
+        "${chip_root}/examples/shell",
+        "${chip_root}/src/lib/shell",
+        "${chip_root}/src/qrcodetool",
+        "${chip_root}/src/setup_payload",
+      ]
+    }
+  }
+
+  if (chip_build_tests) {
+    import("//build/chip_test_group.gni")
+
+    chip_test_group("tests") {
+      deps = [
+        "${chip_root}/src/app/plugin/tests",
+        "${chip_root}/src/ble/tests",
+        "${chip_root}/src/crypto/tests",
+        "${chip_root}/src/inet/tests",
+        "${chip_root}/src/lib/core/tests",
+        "${chip_root}/src/lib/support/tests",
+        "${chip_root}/src/lwip/tests",
+        "${chip_root}/src/setup_payload/tests",
+        "${chip_root}/src/system/tests",
+        "${chip_root}/src/transport/tests",
+      ]
+    }
+
+    group("check") {
+      deps = [ ":tests_run" ]
+    }
+  }
+} else {
+  # This is the dummy toolchain. Configure various real toolchains.
+  import("//build/chip_build.gni")
+  declare_args() {
+    # Set this to false to disable all builds by default.
+    enable_default_builds = true
+  }
+
+  declare_args() {
+    # Enable building chip with clang.
+    enable_host_clang_build = enable_default_builds
+
+    # Enable building chip with gcc.
+    enable_host_gcc_build = enable_default_builds
+
+    # Build building chip with gcc & mbedtls.
+    enable_host_gcc_mbdtls_build = enable_default_builds
+
+    # Build the nRF5 lock app example.
+    enable_nrf5_lock_app_build = false
+  }
+
+  if (enable_nrf5_lock_app_build) {
+    import("//build_overrides/nrf5_lock_app.gni")
+  }
+
+  import("//build/toolchain/host_clang/toolchains.gni")
+  import("//build/toolchain/host_gcc/toolchains.gni")
+  chip_build("host_clang") {
+    toolchain = "//build/toolchain/host_clang:${host_os}_${host_cpu}_clang"
+  }
+
+  chip_build("host_gcc") {
+    toolchain = "//build/toolchain/host_gcc:${host_os}_${host_cpu}_gcc"
+  }
+
+  chip_build("host_gcc_mbedtls") {
+    toolchain = "//build/toolchain/host_gcc:${host_os}_${host_cpu}_gcc_mbedtls"
+  }
+
+  group("default") {
+    deps = []
+    if (enable_host_clang_build) {
+      deps += [ ":all_host_clang" ]
+    }
+    if (enable_host_gcc_build) {
+      deps += [ ":all_host_gcc" ]
+    }
+    if (enable_host_gcc_mbdtls_build) {
+      deps += [ ":all_host_gcc_mbedtls" ]
+    }
+    if (enable_nrf5_lock_app_build) {
+      deps += [ "${nrf5_lock_app_root}:nrf5(${nrf5_lock_app_root}/toolchain:nrf5_lock_app)" ]
+    }
+  }
+
+  if (chip_build_tests) {
+    group("check") {
+      deps = []
+      if (enable_host_clang_build) {
+        deps += [ ":check_host_clang" ]
+      }
+      if (enable_host_gcc_build) {
+        deps += [ ":check_host_gcc" ]
+      }
+      if (enable_host_gcc_mbdtls_build) {
+        deps += [ ":check_host_gcc_mbedtls" ]
+      }
+      if (enable_nrf5_lock_app_build) {
+        deps += [ ":default" ]
+      }
+    }
+  }
+}

activate.sh

@@ -14,7 +14,9 @@
 # limitations under the License.
 #
 
-CHIP_ROOT="$(dirname "$0")"
+if [[ ! -d "${CHIP_ROOT}" ]]; then
+  CHIP_ROOT="$(dirname "$0")"
+fi
 
 export PW_BRANDING_BANNER="$CHIP_ROOT/.chip-banner.txt"
 export PW_BRANDING_BANNER_COLOR="bold_white"

examples/chip-tool/BUILD.gn

@@ -0,0 +1,31 @@
+# Copyright (c) 2020 Project CHIP Authors
+#
+# 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.
+
+import("//build_overrides/chip.gni")
+
+import("//build/tools.gni")
+
+assert(chip_build_tools)
+
+executable("chip-standalone-demo") {
+  sources = [ "main.cpp" ]
+
+  public_deps = [ "${chip_root}/src/lib" ]
+
+  output_dir = "${root_out_dir}/bin"
+}
+
+group("chip-tool") {
+  deps = [ ":chip-standalone-demo" ]
+}

examples/lock-app/nrf5/.gn

@@ -0,0 +1,26 @@
+# Copyright (c) 2020 Project CHIP Authors
+#
+# 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.
+
+# The location of the build configuration file.
+buildconfig = "//build/config/BUILDCONFIG.gn"
+
+# CHIP uses angle bracket includes.
+check_system_includes = true
+
+# Allow loading paths relative to //gn.
+secondary_source = "//third_party/connectedhomeip/gn/"
+
+default_args = {
+  import("//args.gni")
+}