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Unified Diff: tools/gn/function_set_default_toolchain.cc

Issue 21114002: Add initial prototype for the GN meta-buildsystem. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: add owners and readme Created 7 years, 5 months ago
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Index: tools/gn/function_set_default_toolchain.cc
diff --git a/tools/gn/function_set_default_toolchain.cc b/tools/gn/function_set_default_toolchain.cc
new file mode 100644
index 0000000000000000000000000000000000000000..4939ac84cee92cc45d27216bed1ae2091398070b
--- /dev/null
+++ b/tools/gn/function_set_default_toolchain.cc
@@ -0,0 +1,70 @@
+// 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 "tools/gn/build_settings.h"
+#include "tools/gn/functions.h"
+#include "tools/gn/parse_tree.h"
+#include "tools/gn/scope.h"
+#include "tools/gn/settings.h"
+#include "tools/gn/toolchain_manager.h"
+
+/*
+set_default_toolchain: Sets the default toolchain name.
+
+ set_default_toolchain(toolchain_label)
+
+ The given label should identify a toolchain definition (see "toolchain").
+ This toolchain will be used for all targets unless otherwise specified.
+
+ This function is only valid to call during the processing of the build
+ configuration file. Since the build configuration file is processed
+ separately for each toolchain, this function will be a no-op when called
+ under any non-default toolchains.
+
+ For example, the default toolchain should be appropriate for the current
+ environment. If the current environment is 32-bit and somebody references
+ a target with a 64-bit toolchain, we wouldn't want processing of the build
+ config file for the 64-bit toolchain to reset the default toolchain to
+ 64-bit, we want to keep it 32-bits.
+
+Argument:
+
+ toolchain_label:
+ Toolchain name.
+
+Example:
+
+ set_default_toolchain("//build/config/win:vs32")
+*/
+
+Value ExecuteSetDefaultToolchain(Scope* scope,
+ const FunctionCallNode* function,
+ const std::vector<Value>& args,
+ Err* err) {
+ if (!scope->IsProcessingBuildConfig()) {
+ *err = Err(function->function(), "Must be called from build config.",
+ "set_default_toolchain can only be called from the build configuration "
+ "file.");
+ return Value();
+ }
+
+ // Ignore non-default-build-config invocations.
+ if (!scope->IsProcessingDefaultBuildConfig())
+ return Value();
+
+ const SourceDir& current_dir = SourceDirForFunctionCall(function);
+ const Label& default_toolchain = ToolchainLabelForScope(scope);
+
+ if (!EnsureSingleStringArg(function, args, err))
+ return Value();
+ Label toolchain_label(
+ Label::Resolve(current_dir, default_toolchain, args[0], err));
+ if (toolchain_label.is_null())
+ return Value();
+
+ ToolchainManager& mgr =
+ scope->settings()->build_settings()->toolchain_manager();
+ mgr.SetDefaultToolchainUnlocked(toolchain_label, function->GetRange(), err);
+ return Value();
+}
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