gn: Change flag --system-cxx to --no-system-cxx

Author: JSUYA

.github/workflows/build.yml

@@ -58,7 +58,6 @@ jobs:
             --target-cpu ${{ matrix.arch }} \
             --target-toolchain /usr/lib/llvm-12 \
             --target-sysroot src/sysroot-6.0/${{ matrix.arch }} \
-            --system-cxx \
             --target-dir build
           ninja -C src/out/build
 
@@ -69,7 +68,7 @@ jobs:
             --target-cpu ${{ matrix.arch }} \
             --target-toolchain /usr/lib/llvm-12 \
             --target-sysroot src/sysroot-6.5/${{ matrix.arch }} \
-            --api-version 6.5 --system-cxx \
+            --api-version 6.5 \
             --target-dir build
           ninja -C src/out/build
 

README.md

@@ -58,7 +58,7 @@ The Flutter embedder for Tizen.
 ### Notes
 
 - To build an app (TPK) with the embedder generated in the above, copy the output artifacts (`libflutter_tizen*.so`) into the [flutter-tizen](https://github.com/flutter-tizen/flutter-tizen) tool's cached artifacts directory (`flutter/bin/cache/artifacts/engine`) and run `flutter-tizen run` or `flutter-tizen build tpk`.
-- To use the target device's `libstdc++.so` instead of the embedder's built-in libc++ (`third_party/libcxx`), provide the `--system-cxx` option to `tools/gn`.
+- To use the embedder's built-in libc++ (`third_party/libcxx`) instead of the target device's `libstdc++.so`, provide the `--no-system-cxx` option to `tools/gn`.
 - Building NUI-related code requires a sysroot for Tizen 6.5 or above and the `--api-version 6.5` option.
 
 ## Repository structure

build/config/BUILDCONFIG.gn

@@ -30,22 +30,22 @@ declare_args() {
   api_version = ""
 
   # Use the system libstdc++ without building third_party/libcxx from source.
-  use_system_cxx = false
+  no_system_cxx = false
 }
 
 _default_configs = [
   "//build/config:compiler",
   "//build/config:cxx_version_default",
 ]
 
-if (use_system_cxx) {
-  _default_configs += [ "//build/config:system_cxx" ]
-} else {
+if (no_system_cxx) {
   _default_configs += [
     "//build/config:no_system_cxx",
     "//third_party/libcxxabi:libcxxabi_config",
     "//third_party/libcxx:libcxx_config",
   ]
+} else {
+  _default_configs += [ "//build/config:system_cxx" ]
 }
 
 if (is_unopt) {
@@ -60,7 +60,7 @@ set_defaults("executable") {
   configs = _executable_configs
   deps = []
 
-  if (!use_system_cxx) {
+  if (no_system_cxx) {
     deps += [ "//third_party/libcxx" ]
   }
 }
@@ -74,7 +74,7 @@ set_defaults("shared_library") {
   configs = _executable_configs
   deps = []
 
-  if (!use_system_cxx) {
+  if (no_system_cxx) {
     deps += [ "//third_party/libcxx" ]
   }
 }

tools/gn

@@ -75,7 +75,7 @@ def to_gn_args(args):
 
   gn_args['clang_version'] = get_clang_version(args.target_toolchain)
   gn_args['api_version'] = args.api_version
-  gn_args['use_system_cxx'] = args.system_cxx
+  gn_args['no_system_cxx'] = args.no_system_cxx
 
   for key, val in gn_args.items():
     if isinstance(val, bool):
@@ -101,7 +101,7 @@ def parse_args(args):
   parser.add_argument('--target-sysroot', type=str)
 
   parser.add_argument('--api-version', default='6.0', type=str)
-  parser.add_argument('--system-cxx', default=False, action='store_true')
+  parser.add_argument('--no-system-cxx', default=False, action='store_true')
 
   parser.add_argument('--target-dir', type=str)
   parser.add_argument('--verbose', default=False, action='store_true')