Simplify buildtools (flutter#9875)

Move GN, only get clang

.gitignore

@@ -23,3 +23,6 @@ pubspec.lock
 .vscode/
 docs/doxygen/
 xcuserdata
+
+third_party/gn/
+

DEPS

@@ -107,8 +107,6 @@ vars = {
   # Build bot tooling for iOS
   'ios_tools_revision': '69b7c1b160e7107a6a98d948363772dc9caea46f',
 
-  'buildtools_revision': 'bac220c15490dcf7b7d8136f75100bbc77e8d217',
-
   # Checkout Android dependencies only on platforms where we build for Android targets.
   'download_android_deps': 'host_os == "mac" or host_os == "linux"',
 
@@ -163,9 +161,6 @@ deps = {
    # As part of integrating with Fuchsia, we should eventually remove all these
    # Chromium-style dependencies.
 
-  'src/buildtools':
-   Var('fuchsia_git') + '/buildtools' + '@' +  Var('buildtools_revision'),
-
   'src/ios_tools':
    Var('chromium_git') + '/chromium/src/ios.git' + '@' + Var('ios_tools_revision'),
 
@@ -473,6 +468,27 @@ deps = {
      'dep_type': 'cipd',
    },
 
+  'src/flutter/third_party/gn': {
+    'packages': [
+      {
+        'package': 'gn/gn/${{platform}}',
+        'version': 'git_revision:bdb0fd02324b120cacde634a9235405061c8ea06'
+      },
+    ],
+    'dep_type': 'cipd',
+  },
+
+  'src/buildtools/{host_os}-x64/clang': {
+    'packages': [
+      {
+        'package': 'fuchsia/clang/${{platform}}',
+        'version': 'git_revision:de39621f0f03f20633bdfa50bde97a3908bf6e98'
+      }
+    ],
+    'condition': 'host_os == "mac" or host_os == "linux"',
+    'dep_type': 'cipd',
+  },
+
    # Get the SDK from https://chrome-infra-packages.appspot.com/p/fuchsia/sdk/core at the 'latest' tag
    # Get the toolchain from https://chrome-infra-packages.appspot.com/p/fuchsia/clang at the 'goma' tag
 
@@ -546,14 +562,6 @@ hooks = [
         'src/flutter/tools/android_support/download_android_support.py',
     ],
   },
-  {
-    'name': 'buildtools',
-    'pattern': '.',
-    'action': [
-      'python',
-      'src/tools/buildtools/update.py',
-    ],
-  },
   {
     'name': 'generate_package_files',
     'pattern': '.',

ci/check_gn_format.py

@@ -43,7 +43,7 @@ def main():
     if subprocess.call(gn_command + [ gn_file ]) != 0:
       print "ERROR: '%s' is incorrectly formatted." % os.path.relpath(gn_file, args.root_directory)
       print "Format the same with 'gn format' using the 'gn' binary in //buildtools."
-      print "Or, run ./ci/check_gn_format.py with '--dry-run false'" 
+      print "Or, run ./ci/check_gn_format.py with '--dry-run false'"
       return -1
 
   return 0

ci/format.sh

@@ -75,4 +75,4 @@ if [[ ! -z "$TRAILING_SPACES" ]]; then
 fi
 
 # Check GN format consistency
-./ci/check_gn_format.py --dry-run true --root-directory . --gn-binary "../buildtools/$OS/gn"
+./ci/check_gn_format.py --dry-run true --root-directory . --gn-binary "third_party/gn/gn"

ci/licenses_golden/tool_signature

@@ -1,2 +1,2 @@
-Signature: 028d24b0ed18e117e64d68853b628ca9
+Signature: aceb453d2bca05fab3734ed5f7949c51
 

tools/gn

@@ -345,17 +345,10 @@ def parse_args(args):
 def main(argv):
   args = parse_args(argv)
 
-  if sys.platform.startswith(('cygwin', 'win')):
-    subdir = 'win'
-  elif sys.platform == 'darwin':
-    subdir = 'mac-x64'
-  elif sys.platform.startswith('linux'):
-     subdir = 'linux-x64'
-  else:
-    raise Error('Unknown platform: ' + sys.platform)
+  exe = '.exe' if sys.platform.startswith(('cygwin', 'win')) else ''
 
   command = [
-    '%s/buildtools/%s/gn' % (SRC_ROOT, subdir),
+    '%s/flutter/third_party/gn/gn%s' % (SRC_ROOT, exe),
     'gen',
     '--check',
   ]

tools/licenses/lib/main.dart

@@ -926,17 +926,18 @@ class _RepositoryDirectory extends _RepositoryEntry implements LicenseSource {
   List<_RepositoryDirectory> get virtualSubdirectories => <_RepositoryDirectory>[];
 
   bool shouldRecurse(fs.IoNode entry) {
-    return entry.name != '.cipd' &&
-           entry.name != '.git' &&
-           entry.name != '.github' &&
-           entry.name != '.gitignore' &&
-           entry.name != '.vscode' &&
-           entry.name != 'test' &&
-           entry.name != 'test.disabled' &&
-           entry.name != 'test_support' &&
-           entry.name != 'tests' &&
-           entry.name != 'javatests' &&
-           entry.name != 'testing';
+    return !entry.fullName.endsWith('third_party/gn') &&
+            entry.name != '.cipd' &&
+            entry.name != '.git' &&
+            entry.name != '.github' &&
+            entry.name != '.gitignore' &&
+            entry.name != '.vscode' &&
+            entry.name != 'test' &&
+            entry.name != 'test.disabled' &&
+            entry.name != 'test_support' &&
+            entry.name != 'tests' &&
+            entry.name != 'javatests' &&
+            entry.name != 'testing';
   }
 
   _RepositoryDirectory createSubdirectory(fs.Directory entry) {