[iOS/GN] Convert //ios/third_party/ochamcrest to build a framework.

build/config/ios/rules.gni

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/ios/ios_sdk.gni")
 import("//build/config/mac/rules.gni")
 
 # TODO(crbug.com/297668): refactor this template to extract common behaviour
 # between OS X and iOS bundle generation, then create a generic "app" template
 # that forward to "executable" on all platform except iOS/OS X.
@@ skipping 58 matching lines @@
           "-s=IOS_DEPLOYMENT_TARGET=$ios_deployment_target",
           "-s=IOS_PLATFORM_BUILD=$ios_platform_build",
           "-s=IOS_PLATFORM_NAME=$ios_sdk_name",
           "-s=IOS_PLATFORM_VERSION=$ios_sdk_version",
           "-s=IOS_SDK_BUILD=$ios_sdk_build",
           "-s=IOS_SDK_NAME=$ios_sdk_name$ios_sdk_version",
           "-s=IOS_SUPPORTED_PLATFORM=$ios_sdk_platform",
           "-s=PRODUCT_NAME=$_output_name",
           "-s=XCODE_BUILD=$xcode_build",
           "-s=XCODE_VERSION=$xcode_version",
-          "-o=" + rebase_path(outputs[0], root_build_dir),
-        ] + rebase_path(sources, root_build_dir)
+          "-o=" + rebase_path(outputs[0], root_out_dir),
+        ] + rebase_path(sources, root_out_dir)
     args = [ "@{{response_file_name}}" ]
   }
 
   bundle_data(_bundle_data_info_plist) {
     forward_variables_from(invoker, [ "testonly" ])
     visibility = [ ":$_target_name" ]
     sources = get_target_outputs(":$_generate_info_plist")
     outputs = [
       "{{bundle_root_dir}}/Info.plist",
     ]
@@ skipping 12 matching lines @@
                            [
                              "assert_no_deps",
                              "code_signing_identity",
                              "data_deps",
                              "entitlements_path",
                              "info_plist",
                              "output_name",
                              "visibility",
                            ])
 
-    output_name = rebase_path("$target_gen_dir/$_output_name", root_build_dir)
+    output_name = rebase_path("$target_gen_dir/$_output_name", root_out_dir)
     if (!defined(libs)) {
       libs = []
     }
     libs += [ "UIKit.framework" ]
 
     # TODO(crbug.com/599203) - iossim should probably be a data dependency
     # of the create_bundle(target_name) target instead but at the moment
     # create_bundle() is ignoring data_deps.
     if (use_ios_simulator) {
       if (!defined(data_deps)) {
@@ skipping 79 matching lines @@
     outputs = [
       "$target_gen_dir/$_nib_filename/objects.nib",
       "$target_gen_dir/$_nib_filename/runtime.nib",
     ]
     args = [
       "--minimum-deployment-target",
       ios_deployment_target,
       "--output",
       rebase_path("$target_gen_dir/$_nib_filename"),
       "--input",
-      rebase_path(invoker.source, root_build_dir),
+      rebase_path(invoker.source, root_out_dir),
     ]
   }
 
   bundle_data(_target_name) {
     forward_variables_from(invoker, "*", [ "source" ])
 
     if (!defined(public_deps)) {
       public_deps = []
     }
     public_deps += [ ":$_compile_xib" ]
@@ skipping 15 matching lines @@
 #     output_name:
 #         (optional) string, name of the generated framework without the
 #         .framework suffix. If omitted, defaults to target_name.
 #
 #     framework_version:
 #         (optional) string, version of the framework. Typically this is a
 #         single letter, like "A". If omitted, the Versions/ subdirectory
 #         structure will not be created, and build output will go directly
 #         into the framework subdirectory.
 #
+#     public_headers:
+#         (optional) list of paths to header file that needs to be copied
+#         into the framework bundle Headers subdirectory. If omitted or
+#         empty then the Headers subdirectory is not created.
+#
+#     sources
+#         (optional) list of files. Needs to be defined and non-empty if
+#         public_headers is defined and non-empty.
+#
 # See "gn help shared_library" for more information on arguments supported
 # by shared library target.
 template("ios_framework_bundle") {
+  if (defined(invoker.public_headers) && invoker.public_headers != []) {
+    assert(defined(invoker.sources) && invoker.sources != [],
+           "sources must be set for $target_name when public_headers is set")
+
+    _target_name = target_name
+    _output_name = target_name
+    if (defined(invoker.output_name)) {
+      _output_name = invoker.output_name
+    }
+
+    _public_headers = invoker.public_headers
+    _framework_name = _output_name + ".framework"
+    _framework_root = "$root_out_dir/$_framework_name"
+
+    _header_map_filename = "$target_gen_dir/$_output_name.headers.hmap"
+    _framework_headers_target = _target_name + "_framework_headers"
+
+    _compile_headers_map_target = _target_name + "_compile_headers_map"
+    action(_compile_headers_map_target) {
+      visibility = [ ":$_framework_headers_target" ]
+      script = "$root_out_dir/gyp-mac-tool"
+      outputs = [
+        _header_map_filename,
+      ]
+
+      set_sources_assignment_filter([

[brettw, 2016/04/12 22:03:48]

Can you comment the high-level thing you're doing here (i.e. you want only the
.h files from the sources).

+                                      "*.c",
+                                      "*.cc",
+                                      "*.cpp",
+                                      "*.m",
+                                      "*.mm",
+                                    ])
+      sources = invoker.sources
+      set_sources_assignment_filter([])
+
+      args = [
+               "compile-ios-framework-header-map",
+               rebase_path(_header_map_filename),
+               rebase_path(_framework_root, root_out_dir),
+             ] + rebase_path(sources, root_out_dir)
+    }
+
+    _create_module_map_target = _target_name + "_module_map"
+    action(_create_module_map_target) {
+      visibility = [ ":$_framework_headers_target" ]
+      script = "$root_out_dir/gyp-mac-tool"
+      outputs = [
+        "$_framework_root/Modules/module.modulemap",
+      ]
+      args = [
+        "package-ios-framework",
+        rebase_path("$_framework_root", root_out_dir),
+      ]
+    }
+
+    _copy_public_headers_target = _target_name + "_copy_public_headers"
+    copy(_copy_public_headers_target) {
+      visibility = [ ":$_framework_headers_target" ]
+      sources = _public_headers
+      outputs = [
+        "$_framework_root/Headers/{{source_file_part}}",
+      ]
+    }
+
+    _headers_map_config = _target_name + "_headers_map"
+    config(_headers_map_config) {
+      visibility = [ ":$_target_name" ]
+      include_dirs = [ _header_map_filename ]
+    }
+
+    group(_framework_headers_target) {
+      deps = [
+        ":$_compile_headers_map_target",
+        ":$_copy_public_headers_target",
+        ":$_create_module_map_target",
+      ]
+    }
+  }
+
   framework_bundle(target_name) {
-    forward_variables_from(invoker, "*")
+    forward_variables_from(invoker, "*", [ "public_headers" ])
+
+    if (defined(_public_headers)) {
+      configs += [ ":$_headers_map_config" ]
+      if (!defined(deps)) {
+        deps = []
+      }
+      deps += [ ":$_framework_headers_target" ]
+    }
   }
 }