Support spaces in Mac GN build output names.

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 577 matching lines @@
     "  All paths are relative to the root build directory, which is the\n"
     "  current directory for running all tools. These expansions are\n"
     "  available to all tools:\n"
     "\n"
     "    {{label}}\n"
     "        The label of the current target. This is typically used in the\n"
     "        \"description\" field for link tools. The toolchain will be\n"
     "        omitted from the label for targets in the default toolchain, and\n"
     "        will be included for targets in other toolchains.\n"
     "\n"
+    "    {{label_name}}\n"
+    "        The short name of the label of the target. This is the part\n"
+    "        after the colon. For \"//foo/bar:baz\" this will be \"baz\".\n"
+    "        Unlike {{target_output_name}}, this is not affected by the\n"
+    "        \"output_prefix\" in the tool or the \"output_name\" set\n"
+    "        on the target.\n"
+    "\n"
     "    {{output}}\n"
     "        The relative path and name of the output(s) of the current\n"
     "        build step. If there is more than one output, this will expand\n"
     "        to a list of all of them.\n"
     "        Example: \"out/base/my_file.o\"\n"
     "\n"
     "    {{target_gen_dir}}\n"
     "    {{target_out_dir}}\n"
     "        The directory of the generated file and output directories,\n"
     "        respectively, for the current target. There is no trailing\n"
     "        slash.\n"
     "        Example: \"out/base/test\"\n"
     "\n"
     "    {{target_output_name}}\n"
     "        The short name of the current target with no path information,\n"
     "        or the value of the \"output_name\" variable if one is specified\n"
     "        in the target. This will include the \"output_prefix\" if any.\n"
+    "        See also {{label_name}}.\n"
     "        Example: \"libfoo\" for the target named \"foo\" and an\n"
     "        output prefix for the linker tool of \"lib\".\n"
     "\n"
     "  Compiler tools have the notion of a single input and a single output,\n"
     "  along with a set of compiler-specific flags. The following expansions\n"
     "  are available:\n"
     "\n"
     "    {{asmflags}}\n"
     "    {{cflags}}\n"
     "    {{cflags_c}}\n"
@@ skipping 333 matching lines @@
     return Value();
 
   Scope::KeyValueMap values;
   block_scope.GetCurrentScopeValues(&values);
   toolchain->args() = values;
 
   return Value();
 }
 
 }  // namespace functions