Rename GN tool's deps to depsformat.

This avoids collisions with the "deps" list of a toolchain.

R=noelallen@chromium.org

Review URL: https://codereview.chromium.org/361503003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@280619 0039d316-1c4b-4281-b951-d872f2087c98

tools/gn/function_toolchain.cc

@@ -173,9 +173,12 @@ const char kTool_Help[] =
     "  they work. Don't forget to backslash-escape $ required by Ninja to\n"
     "  prevent GN from doing variable expansion.\n"
     "\n"
-    "    command, depfile, deps, description, pool, restat, rspfile,\n"
+    "    command, depfile, depsformat, description, pool, restat, rspfile,\n"
     "    rspfile_content\n"
     "\n"
+    "  (Note that GN uses \"depsformat\" for Ninja's \"deps\" variable to\n"
+    "  avoid confusion with dependency lists.)\n"
+    "\n"
     "  Additionally, lib_prefix and lib_dir_prefix may be used for the link\n"
     "  tools. These strings will be prepended to the libraries and library\n"
     "  search directories, respectively, because linkers differ on how to\n"
@@ -236,7 +239,11 @@ Value RunTool(Scope* scope,
   Toolchain::Tool t;
   if (!ReadString(block_scope, "command", &t.command, err) ||
       !ReadString(block_scope, "depfile", &t.depfile, err) ||
-      !ReadString(block_scope, "deps", &t.deps, err) ||
+      // TODO(brettw) delete this once we rename "deps" -> "depsformat" in
+      // the toolchain definitions. This will avoid colliding with the
+      // toolchain's "deps" list. For now, accept either.
+      !ReadString(block_scope, "deps", &t.depsformat, err) ||
+      !ReadString(block_scope, "depsformat", &t.depsformat, err) ||
       !ReadString(block_scope, "description", &t.description, err) ||
       !ReadString(block_scope, "lib_dir_prefix", &t.lib_dir_prefix, err) ||
       !ReadString(block_scope, "lib_prefix", &t.lib_prefix, err) ||

tools/gn/ninja_toolchain_writer.cc

@@ -79,13 +79,16 @@ void NinjaToolchainWriter::WriteRules() {
         out_ << indent << "  " STRINGIZE(name) " = " << tool.name << std::endl;
     WRITE_ARG(command);
     WRITE_ARG(depfile);
-    WRITE_ARG(deps);
     WRITE_ARG(description);
     WRITE_ARG(pool);
     WRITE_ARG(restat);
     WRITE_ARG(rspfile);
     WRITE_ARG(rspfile_content);
     #undef WRITE_ARG
+
+    // Deps is called "depsformat" in GN to avoid confusion with dependencies.
+    if (!tool.depsformat.empty()) \
+      out_ << indent << "  deps = " << tool.depsformat << std::endl;
   }
   out_ << std::endl;
 }

tools/gn/toolchain.h

@@ -61,7 +61,7 @@ class Toolchain : public Item {
 
     std::string command;
     std::string depfile;
-    std::string deps;
+    std::string depsformat;
     std::string description;
     std::string lib_dir_prefix;
     std::string lib_prefix;