Cleanup references to concurrent_links in gn binary.

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 <utility>
 
 #include "tools/gn/err.h"
 #include "tools/gn/functions.h"
@@ skipping 314 matching lines @@
     "    dependencies these must be targets defined in another toolchain.\n"
     "\n"
     "    This is expressed as a list of targets, and generally these targets\n"
     "    will always specify a toolchain:\n"
     "      deps = [ \"//foo/bar:baz(//build/toolchain:bootstrap)\" ]\n"
     "\n"
     "    This concept is somewhat inefficient to express in Ninja (it\n"
     "    requires a lot of duplicate of rules) so should only be used when\n"
     "    absolutely necessary.\n"
     "\n"
-    "  concurrent_links\n"
-    "    In integer expressing the number of links that Ninja will perform in\n"
-    "    parallel. GN will create a pool for shared library and executable\n"
-    "    link steps with this many processes. Since linking is memory- and\n"
-    "    I/O-intensive, projects with many large targets may want to limit\n"
-    "    the number of parallel steps to avoid overloading the computer.\n"
-    "    Since creating static libraries is generally not as intensive\n"
-    "    there is no limit to \"alink\" steps.\n"
-    "\n"
-    "    Defaults to 0 which Ninja interprets as \"no limit\".\n"
-    "\n"
-    "    The value used will be the one from the default toolchain of the\n"
-    "    current build.\n"
-    "\n"
     "Invoking targets in toolchains:\n"
     "\n"
     "  By default, when a target depends on another, there is an implicit\n"
     "  toolchain label that is inherited, so the dependee has the same one\n"
     "  as the dependent.\n"
     "\n"
     "  You can override this and refer to any other toolchain by explicitly\n"
     "  labeling the toolchain to use. For example:\n"
     "    data_deps = [ \"//plugins:mine(//toolchains:plugin_toolchain)\" ]\n"
     "  The string \"//build/toolchains:plugin_toolchain\" is a label that\n"
     "  identifies the toolchain declaration for compiling the sources.\n"
     "\n"
     "  To load a file in an alternate toolchain, GN does the following:\n"
     "\n"
     "   1. Loads the file with the toolchain definition in it (as determined\n"
     "      by the toolchain label).\n"
     "   2. Re-runs the master build configuration file, applying the\n"
     "      arguments specified by the toolchain_args section of the toolchain\n"
     "      definition (see \"gn help toolchain_args\").\n"
     "   3. Loads the destination build file in the context of the\n"
     "      configuration file in the previous step.\n"
     "\n"
     "Example:\n"
     "  toolchain(\"plugin_toolchain\") {\n"
-    "    concurrent_links = 8\n"
-    "\n"
     "    tool(\"cc\") {\n"
     "      command = \"gcc {{source}}\"\n"
     "      ...\n"
     "    }\n"
     "\n"
     "    toolchain_args() {\n"
     "      is_plugin = true\n"
     "      is_32bit = true\n"
     "      is_64bit = false\n"
     "    }\n"
@@ skipping 36 matching lines @@
   // Read deps (if any).
   const Value* deps_value = block_scope.GetValue(variables::kDeps, true);
   if (deps_value) {
     ExtractListOfLabels(
         *deps_value, block_scope.GetSourceDir(),
         ToolchainLabelForScope(&block_scope), &toolchain->deps(), err);
     if (err->has_error())
       return Value();
   }
 
-  // Read concurrent_links (if any).
-  const Value* concurrent_links_value =
-      block_scope.GetValue("concurrent_links", true);
-  if (concurrent_links_value) {
-    if (!concurrent_links_value->VerifyTypeIs(Value::INTEGER, err))
-      return Value();
-    if (concurrent_links_value->int_value() < 0 ||
-        concurrent_links_value->int_value() > std::numeric_limits<int>::max()) {
-      *err = Err(*concurrent_links_value, "Value out of range.");
-      return Value();
-    }
-    toolchain->set_concurrent_links(
-        static_cast<int>(concurrent_links_value->int_value()));
-  }
-
   if (!block_scope.CheckForUnusedVars(err))
     return Value();
 
   // Save this toolchain.
   toolchain->ToolchainSetupComplete();
   Scope::ItemVector* collector = scope->GetItemCollector();
   if (!collector) {
     *err = Err(function, "Can't define a toolchain in this context.");
     return Value();
   }
@@ skipping 660 matching lines @@
     return Value();
 
   Scope::KeyValueMap values;
   block_scope.GetCurrentScopeValues(&values);
   toolchain->args() = values;
 
   return Value();
 }
 
 }  // namespace functions