Invoke copy_tree.py only once to collect all input file lists.

sdk/BUILD.gn

 # Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # This GN file contains build rules for assembling the Dart SDK. There are
 # two possible variants: the "Full" SDK, and the "Platform" SDK. If you want
 # to make a new subset of the Full SDK, make it the same way we make
 # the Platform SDK.
 #
 # Warning:
@@ skipping 192 matching lines @@
 ]
 
 # Package sources copied to lib/
 _analyzer_source_dirs = [
   "analyzer",
   "analysis_server",
   "front_end",
   "kernel",
 ]
 
+# From here down to the copy_trees() invocation, we collect all the information
+# about trees that need to be copied in the list of scopes, copy_tree_specs.
+copy_tree_specs = []
+
+# This loop generates rules for copying analyzer sources into lib/
+foreach(analyzer_source_dir, _analyzer_source_dirs) {
+  copy_tree_specs += [{
+    target = "copy_${analyzer_source_dir}_source_dir"
+    visibility = [ ":copy_analyzer_sources" ]
+    source = "../pkg/$analyzer_source_dir"
+    dest = "$root_out_dir/dart-sdk/lib/$analyzer_source_dir"
+    ignore_patterns = "*.svn,doc,*.py,*.gypi,*.sh,.gitignore,packages,test,testcases"
+  }]
+}
+
+# This rule copies dartdoc templates to
+# bin/snapshots/resources/dartdoc/templates
+copy_tree_specs += [{
+  target = "copy_dartdoc_templates"
+  visibility = [ ":copy_dartdoc_files" ]
+  source = "../third_party/pkg/dartdoc/lib/templates"
+  dest = "$root_out_dir/dart-sdk/bin/snapshots/resources/dartdoc/templates"
+  ignore_patterns = "{}"
+}]
+
+# This rule copies dartdoc resources to
+# bin/snapshots/resources/dartdoc/resources
+copy_tree_specs += [{
+  target = "copy_dartdoc_resources"
+  visibility = [ ":copy_dartdoc_files" ]
+  source = "../third_party/pkg/dartdoc/lib/resources"
+  dest = "$root_out_dir/dart-sdk/bin/snapshots/resources/dartdoc/resources"
+  ignore_patterns = "{}"
+}]
+
+# This rule copies js needed by ddc to lib/dev_compiler
+copy_tree_specs += [{
+  target = "copy_dev_compiler_js"
+  visibility = [
+    ":copy_dev_compiler_sdk",
+    ":copy_dev_compiler_require_js",
+    ":copy_dev_compiler_tools",
+  ]
+  source = "../pkg/dev_compiler/lib/js"
+  dest = "$root_out_dir/dart-sdk/lib/dev_compiler"
+  ignore_patterns = "{}"
+}]
+
+# This rule copies pub assets to lib/_internal/pub/asset
+copy_tree_specs += [{
+  target = "copy_pub_assets"
+  visibility = [
+    ":create_common_sdk",
+    ":copy_7zip",
+  ]
+  deps = [
+    ":copy_libraries",
+  ]
+  source = "../third_party/pkg/pub/lib/src/asset"
+  dest = "$root_out_dir/dart-sdk/lib/_internal/pub/asset"
+  ignore_patterns = "{}"
+}]
+
+# This loop generates rules to copy libraries to lib/
+foreach(library, _full_sdk_libraries) {
+  copy_tree_specs += [{
+    target = "copy_${library}_library"
+    visibility = [
+      ":copy_platform_sdk_libraries",
+      ":copy_full_sdk_libraries",
+    ]
+    source = "lib/$library"
+    dest = "$root_out_dir/dart-sdk/lib/$library"
+    ignore_patterns = "*.svn,doc,*.py,*.gypi,*.sh,.gitignore"
+  }]
+}
+
+if (is_win) {
+  copy_tree_specs += [{
+    target = "copy_7zip"
+    visibility = [ ":create_common_sdk" ]
+    deps = [
+      ":copy_libraries",
+      ":copy_pub_assets",
+    ]
+    source = "../third_party/7zip"
+    dest = "$root_out_dir/dart-sdk/lib/_internal/pub/asset/7zip"
+    ignore_patterns = ".svn"
+  }]
+}
+
+# This generates targets for everything in copy_tree_specs. The targets have the
+# same name as the "target" fields in the scopes of copy_tree_specs.
+copy_trees("copy_trees") {
+  sources = copy_tree_specs
+}
+
 # Copies the Dart VM binary into bin/
 copy("copy_dart") {
   visibility = [ ":create_common_sdk" ]
   deps = [
     "../runtime/bin:dart",
   ]
   dart_out = get_label_info("../runtime/bin:dart", "root_out_dir")
   if (is_win) {
     sources = [
       "$dart_out/dart.exe",
@@ skipping 142 matching lines @@
 # This is the main rule for copying snapshots from _full_sdk_snapshots to
 # bin/snapshots
 group("copy_full_sdk_snapshots") {
   visibility = [ ":create_full_sdk" ]
   deps = []
   foreach(snapshot, _full_sdk_snapshots) {
     deps += [ ":copy_${snapshot[0]}_snapshot" ]
   }
 }
 
-# This loop generates rules for copying analyzer sources into lib/
-foreach(analyzer_source_dir, _analyzer_source_dirs) {
-  copy_tree("copy_${analyzer_source_dir}_source_dir") {
-    visibility = [ ":copy_analyzer_sources" ]
-    source = "../pkg/$analyzer_source_dir"
-    dest = "$root_out_dir/dart-sdk/lib/$analyzer_source_dir"
-    exclude = "*.svn,doc,*.py,*.gypi,*.sh,.gitignore,packages,test,testcases"
-  }
-}
-
 # This is the main rule for copying analyzer sources to lib/
 group("copy_analyzer_sources") {
   visibility = [ ":create_common_sdk" ]
   deps = []
   foreach(analyzer_source_dir, _analyzer_source_dirs) {
     deps += [ ":copy_${analyzer_source_dir}_source_dir" ]
   }
 }
 
-# This rule copies dartdoc templates to
-# bin/snapshots/resources/dartdoc/templates
-copy_tree("copy_dartdoc_templates") {
-  visibility = [ ":copy_dartdoc_files" ]
-  source = "../third_party/pkg/dartdoc/lib/templates"
-  dest = "$root_out_dir/dart-sdk/bin/snapshots/resources/dartdoc/templates"
-}
-
-# This rule copies dartdoc resources to
-# bin/snapshots/resources/dartdoc/resources
-copy_tree("copy_dartdoc_resources") {
-  visibility = [ ":copy_dartdoc_files" ]
-  source = "../third_party/pkg/dartdoc/lib/resources"
-  dest = "$root_out_dir/dart-sdk/bin/snapshots/resources/dartdoc/resources"
-}
-
 # This rule writes the .packages file for dartdoc resources.
 write_file("$root_out_dir/dart-sdk/bin/snapshots/resources/dartdoc/.packages",
            "dartdoc:.")
 
 # This is the main rule for copying the files that dartdoc needs.
 group("copy_dartdoc_files") {
   visibility = [ ":create_common_sdk" ]
   deps = [
     ":copy_dartdoc_resources",
     ":copy_dartdoc_templates",
@@ skipping 54 matching lines @@
     ":copy_libraries",
   ]
   sources = [
     "../pkg/dev_compiler/lib/sdk/ddc_sdk.sum",
   ]
   outputs = [
     "$root_out_dir/dart-sdk/lib/_internal/{{source_file_part}}",
   ]
 }
 
-# This rule copies js needed by ddc to lib/dev_compiler
-copy_tree("copy_dev_compiler_js") {
-  visibility = [
-    ":copy_dev_compiler_sdk",
-    ":copy_dev_compiler_require_js",
-    ":copy_dev_compiler_tools",
-  ]
-  source = "../pkg/dev_compiler/lib/js"
-  dest = "$root_out_dir/dart-sdk/lib/dev_compiler"
-}
-
 # This rule copies require.js to lib/dev_compiler/amd
 copy("copy_dev_compiler_require_js") {
   visibility = [ ":copy_dev_compiler_sdk" ]
   deps = [
     ":copy_dev_compiler_js",
   ]
   sources = [
     "../third_party/requirejs/require.js",
   ]
   outputs = [
@@ skipping 50 matching lines @@
   sources = [
     "lib/dart_client.platform",
     "lib/dart_server.platform",
     "lib/dart_shared.platform",
   ]
   outputs = [
     "$root_out_dir/dart-sdk/lib/{{source_file_part}}",
   ]
 }
 
-# This rule copies pub assets to lib/_internal/pub/asset
-copy_tree("copy_pub_assets") {
-  visibility = [
-    ":create_common_sdk",
-    ":copy_7zip",
-  ]
-  deps = [
-    ":copy_libraries",
-  ]
-  source = "../third_party/pkg/pub/lib/src/asset"
-  dest = "$root_out_dir/dart-sdk/lib/_internal/pub/asset"
-}
-
-# This loop generates rules to copy libraries to lib/
-foreach(library, _full_sdk_libraries) {
-  copy_tree("copy_${library}_library") {
-    visibility = [
-      ":copy_platform_sdk_libraries",
-      ":copy_full_sdk_libraries",
-    ]
-    source = "lib/$library"
-    dest = "$root_out_dir/dart-sdk/lib/$library"
-    exclude = "*.svn,doc,*.py,*.gypi,*.sh,.gitignore"
-  }
-}
-
 # This is the main rule to copy libraries in _platform_sdk_libraries to lib/
 group("copy_platform_sdk_libraries") {
   visibility = [
     ":create_platform_sdk",
     ":copy_libraries",
   ]
   deps = []
   foreach(library, _platform_sdk_libraries) {
     deps += [ ":copy_${library}_library" ]
   }
@@ skipping 16 matching lines @@
     deps = [
       ":copy_platform_sdk_libraries",
     ]
   } else {
     deps = [
       ":copy_full_sdk_libraries",
     ]
   }
 }
 
-if (is_win) {
-  copy_tree("copy_7zip") {
-    visibility = [ ":create_common_sdk" ]
-    deps = [
-      ":copy_libraries",
-      ":copy_pub_assets",
-    ]
-    source = "../third_party/7zip"
-    dest = "$root_out_dir/dart-sdk/lib/_internal/pub/asset/7zip"
-    exclude = ".svn"
-  }
-}
-
 # This rule writes the version file.
 action("write_version_file") {
   visibility = [ ":create_common_sdk" ]
   output = "$root_out_dir/dart-sdk/version"
   outputs = [
     output,
   ]
   script = "../tools/write_version_file.py"
   args = [
     "--output",
@@ skipping 124 matching lines @@
 group("create_sdk") {
   deps = [
     ":create_common_sdk",
   ]
   if (dart_platform_sdk) {
     deps += [ ":create_platform_sdk" ]
   } else {
     deps += [ ":create_full_sdk" ]
   }
 }