Allow dependencies of toolchains in GN.

tools/gn/ninja_copy_target_writer_unittest.cc

 // Copyright (c) 2013 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.
 
 #include <algorithm>
 #include <sstream>
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "tools/gn/file_template.h"
 #include "tools/gn/ninja_copy_target_writer.h"
 #include "tools/gn/test_with_scope.h"
 
+// Tests mutliple files with an output pattern and no toolchain dependency.
 TEST(NinjaCopyTargetWriter, Run) {
   TestWithScope setup;
+  setup.settings()->set_target_os(Settings::LINUX);
   setup.build_settings()->SetBuildDir(SourceDir("//out/Debug/"));
   Target target(setup.settings(), Label(SourceDir("//foo/"), "bar"));
   target.set_output_type(Target::COPY_FILES);
 
   target.sources().push_back(SourceFile("//foo/input1.txt"));
   target.sources().push_back(SourceFile("//foo/input2.txt"));
 
   target.action_values().outputs().push_back(
       SourceFile("//out/Debug/{{source_name_part}}.out"));
 
-  // Posix.
-  {
-    setup.settings()->set_target_os(Settings::LINUX);
+  std::ostringstream out;
+  NinjaCopyTargetWriter writer(&target, setup.toolchain(), out);
+  writer.Run();
 
-    std::ostringstream out;
-    NinjaCopyTargetWriter writer(&target, setup.toolchain(), out);
-    writer.Run();
+  const char expected_linux[] =
+      "build input1.out: copy ../../foo/input1.txt\n"
+      "build input2.out: copy ../../foo/input2.txt\n"
+      "\n"
+      "build obj/foo/bar.stamp: stamp input1.out input2.out\n";
+  std::string out_str = out.str();
+  EXPECT_EQ(expected_linux, out_str);
+}
 
-    const char expected_linux[] =
-        "build input1.out: copy ../../foo/input1.txt\n"
-        "build input2.out: copy ../../foo/input2.txt\n"
-        "\n"
-        "build obj/foo/bar.stamp: stamp input1.out input2.out\n";
-    std::string out_str = out.str();
-#if defined(OS_WIN)
-    std::replace(out_str.begin(), out_str.end(), '\\', '/');
-#endif
-    EXPECT_EQ(expected_linux, out_str);
-  }
+// Tests a single file with no output pattern and a toolchain dependency.
+TEST(NinjaCopyTargetWriter, ToolchainDeps) {
+  TestWithScope setup;
+  setup.settings()->set_target_os(Settings::LINUX);
+  setup.build_settings()->SetBuildDir(SourceDir("//out/Debug/"));
+  Target target(setup.settings(), Label(SourceDir("//foo/"), "bar"));
+  target.set_output_type(Target::COPY_FILES);
 
-  // Windows.
-  {
-    setup.settings()->set_target_os(Settings::WIN);
+  // Toolchain dependency. Here we make a target in the same toolchain for
+  // simplicity, but in real life (using the Builder) this would be rejected
+  // because it would be a circular dependency (the target depends on its
+  // toolchain, and the toolchain depends on this target).
+  Target toolchain_dep_target(setup.settings(),
+                              Label(SourceDir("//foo/"), "setup"));
+  toolchain_dep_target.set_output_type(Target::ACTION);
+  setup.toolchain()->deps().push_back(LabelTargetPair(&toolchain_dep_target));
 
-    std::ostringstream out;
-    NinjaCopyTargetWriter writer(&target, setup.toolchain(), out);
-    writer.Run();
+  target.sources().push_back(SourceFile("//foo/input1.txt"));
 
-    // TODO(brettw) I think we'll need to worry about backslashes here
-    // depending if we're on actual Windows or Linux pretending to be Windows.
-    const char expected_win[] =
-        "build input1.out: copy ../../foo/input1.txt\n"
-        "build input2.out: copy ../../foo/input2.txt\n"
-        "\n"
-        "build obj/foo/bar.stamp: stamp input1.out input2.out\n";
-    std::string out_str = out.str();
-#if defined(OS_WIN)
-    std::replace(out_str.begin(), out_str.end(), '\\', '/');
-#endif
-    EXPECT_EQ(expected_win, out_str);
-  }
+  target.action_values().outputs().push_back(
+      SourceFile("//out/Debug/output.out"));
+
+  std::ostringstream out;
+  NinjaCopyTargetWriter writer(&target, setup.toolchain(), out);
+  writer.Run();
+
+  const char expected_linux[] =
+      "build obj/foo/bar.inputdeps.stamp: stamp obj/foo/setup.stamp\n"
+      "build output.out: copy ../../foo/input1.txt | "
+          "obj/foo/bar.inputdeps.stamp\n"
+      "\n"
+      "build obj/foo/bar.stamp: stamp output.out\n";
+  std::string out_str = out.str();
+  EXPECT_EQ(expected_linux, out_str);
 }