[GN]: Support for loadable modules

tools/gn/function_toolchain.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 <limits>
 
 #include "tools/gn/err.h"
 #include "tools/gn/functions.h"
 #include "tools/gn/parse_tree.h"
@@ skipping 176 matching lines @@
   return type == Toolchain::TYPE_CC ||
          type == Toolchain::TYPE_CXX ||
          type == Toolchain::TYPE_OBJC ||
          type == Toolchain::TYPE_OBJCXX ||
          type == Toolchain::TYPE_RC ||
          type == Toolchain::TYPE_ASM;
 }
 
 bool IsLinkerTool(Toolchain::ToolType type) {
   return type == Toolchain::TYPE_ALINK ||
+         type == Toolchain::TYPE_DYLINK ||
          type == Toolchain::TYPE_SOLINK ||
          type == Toolchain::TYPE_LINK;
 }
 
 bool IsPatternInOutputList(const SubstitutionList& output_list,
                            const SubstitutionPattern& pattern) {
   for (const auto& cur : output_list.list()) {
     if (pattern.ranges().size() == cur.ranges().size() &&
         std::equal(pattern.ranges().begin(), pattern.ranges().end(),
                    cur.ranges().begin()))
@@ skipping 289 matching lines @@
     "          outputs = [\n"
     "            \"{{root_out_dir}}/{{target_output_name}}"
                      "{{output_extension}}\",\n"
     "            \"{{root_out_dir}}/{{target_output_name}}.lib\",\n"
     "          ]\n"
     "\n"
     "    link_output  [string with substitutions]\n"
     "    depend_output  [string with substitutions]\n"
     "        Valid for: \"solink\" only (optional)\n"
     "\n"
-    "        These two files specify whch of the outputs from the solink\n"
+    "        These two files specify which of the outputs from the solink\n"
     "        tool should be used for linking and dependency tracking. These\n"
     "        should match entries in the \"outputs\". If unspecified, the\n"
     "        first item in the \"outputs\" array will be used for both. See\n"
     "        \"Separate linking and dependencies for shared libraries\"\n"
     "        below for more.\n"
     "\n"
     "        On Windows, where the tools produce a .dll shared library and\n"
     "        a .lib import library, you will want both of these to be the\n"
     "        import library. On Linux, if you're not doing the separate\n"
     "        linking/dependency optimization, both of these should be the\n"
@@ skipping 323 matching lines @@
     // All tools except the copy and stamp tools should have outputs. The copy
     // and stamp tool's outputs are generated internally.
     if (!ReadOutputs(&block_scope, function, subst_output_validator,
                      tool.get(), err))
       return Value();
   }
 
   // Validate that the link_output and depend_output refer to items in the
   // outputs and aren't defined for irrelevant tool types.
   if (!tool->link_output().empty()) {
-    if (tool_type != Toolchain::TYPE_SOLINK) {
+    if (tool_type != Toolchain::TYPE_SOLINK &&
+        tool_type != Toolchain::TYPE_DYLINK) {
       *err = Err(function, "This tool specifies a link_output.",
-          "This is only valid for solink tools.");
+          "This is only valid for solink and dylink tools.");
       return Value();
     }
     if (!IsPatternInOutputList(tool->outputs(), tool->link_output())) {
       *err = Err(function, "This tool's link_output is bad.",
                  "It must match one of the outputs.");
       return Value();
     }
   }
   if (!tool->depend_output().empty()) {
-    if (tool_type != Toolchain::TYPE_SOLINK) {
+    if (tool_type != Toolchain::TYPE_SOLINK &&
+        tool_type != Toolchain::TYPE_DYLINK) {
       *err = Err(function, "This tool specifies a depend_output.",
-          "This is only valid for solink tools.");
+          "This is only valid for solink and dylink tools.");
       return Value();
     }
     if (!IsPatternInOutputList(tool->outputs(), tool->depend_output())) {
       *err = Err(function, "This tool's depend_output is bad.",
                  "It must match one of the outputs.");
       return Value();
     }
   }
   if ((!tool->link_output().empty() && tool->depend_output().empty()) ||
       (tool->link_output().empty() && !tool->depend_output().empty())) {
@@ skipping 80 matching lines @@
     return Value();
 
   Scope::KeyValueMap values;
   block_scope.GetCurrentScopeValues(&values);
   toolchain->args() = values;
 
   return Value();
 }
 
 }  // namespace functions