Don't propagate deps across actions in GN.

tools/gn/target_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 "testing/gtest/include/gtest/gtest.h"
 #include "tools/gn/build_settings.h"
 #include "tools/gn/config.h"
 #include "tools/gn/scheduler.h"
 #include "tools/gn/settings.h"
 #include "tools/gn/target.h"
@@ skipping 216 matching lines @@
   TestTarget c(setup, "//foo:c", Target::STATIC_LIBRARY);
 
   a.public_deps().push_back(LabelTargetPair(&b));
   b.public_deps().push_back(LabelTargetPair(&c));
 
   ASSERT_TRUE(c.OnResolved(&err));
   ASSERT_TRUE(b.OnResolved(&err));
   ASSERT_FALSE(a.OnResolved(&err));
 }
 
+TEST(Target, NoActionDepPropgation) {
+  TestWithScope setup;
+  Err err;
+
+  // Create a dependency chain:
+  //   A (exe) -> B (action) -> C (source_set)
+  {
+    TestTarget a(setup, "//foo:a", Target::EXECUTABLE);
+    TestTarget b(setup, "//foo:b", Target::ACTION);
+    TestTarget c(setup, "//foo:c", Target::SOURCE_SET);
+
+    a.private_deps().push_back(LabelTargetPair(&b));
+    b.private_deps().push_back(LabelTargetPair(&c));
+
+    ASSERT_TRUE(c.OnResolved(&err));
+    ASSERT_TRUE(b.OnResolved(&err));
+    ASSERT_TRUE(a.OnResolved(&err));
+
+    // The executable should not have inherited the source set across the
+    // action.
+    std::vector<const Target*> libs = a.inherited_libraries().GetOrdered();
+    ASSERT_TRUE(libs.empty());
+  }
+}
+
 TEST(Target, GetComputedOutputName) {
   TestWithScope setup;
   Err err;
 
   // Basic target with no prefix (executable type tool in the TestWithScope has
   // no prefix) or output name.
   TestTarget basic(setup, "//foo:bar", Target::EXECUTABLE);
   ASSERT_TRUE(basic.OnResolved(&err));
   EXPECT_EQ("bar", basic.GetComputedOutputName(false));
   EXPECT_EQ("bar", basic.GetComputedOutputName(true));
@@ skipping 354 matching lines @@
       "\n"
       "From //foo:bar\n"
       "  header: pch.h\n"
       "  source: //pcs.cc\n"
       "\n"
       "From //foo:c2\n"
       "  header: pch2.h\n"
       "  source: //pcs2.cc",
       err.help_text());
 }