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87 lines
3.0 KiB
C++
87 lines
3.0 KiB
C++
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// Copyright (c) 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "tools/gn/build_settings.h"
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#include "tools/gn/functions.h"
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#include "tools/gn/loader.h"
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#include "tools/gn/parse_tree.h"
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#include "tools/gn/scope.h"
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#include "tools/gn/settings.h"
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namespace functions {
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const char kSetDefaultToolchain[] = "set_default_toolchain";
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const char kSetDefaultToolchain_HelpShort[] =
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"set_default_toolchain: Sets the default toolchain name.";
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const char kSetDefaultToolchain_Help[] =
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R"(set_default_toolchain: Sets the default toolchain name.
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set_default_toolchain(toolchain_label)
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The given label should identify a toolchain definition (see "gn help
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toolchain"). This toolchain will be used for all targets unless otherwise
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specified.
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This function is only valid to call during the processing of the build
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configuration file. Since the build configuration file is processed
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separately for each toolchain, this function will be a no-op when called
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under any non-default toolchains.
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For example, the default toolchain should be appropriate for the current
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environment. If the current environment is 32-bit and somebody references a
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target with a 64-bit toolchain, we wouldn't want processing of the build
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config file for the 64-bit toolchain to reset the default toolchain to
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64-bit, we want to keep it 32-bits.
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Argument
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toolchain_label
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Toolchain name.
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Example
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# Set default toolchain only has an effect when run in the context of the
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# default toolchain. Pick the right one according to the current CPU
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# architecture.
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if (target_cpu == "x64") {
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set_default_toolchain("//toolchains:64")
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} else if (target_cpu == "x86") {
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set_default_toolchain("//toolchains:32")
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}
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)";
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Value RunSetDefaultToolchain(Scope* scope,
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const FunctionCallNode* function,
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const std::vector<Value>& args,
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Err* err) {
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if (!scope->IsProcessingBuildConfig()) {
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*err = Err(function->function(), "Must be called from build config.",
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"set_default_toolchain can only be called from the build configuration "
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"file.");
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return Value();
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}
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// When the loader is expecting the default toolchain to be set, it will set
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// this key on the scope to point to the destination.
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Label* default_toolchain_dest = static_cast<Label*>(
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scope->GetProperty(Loader::kDefaultToolchainKey, nullptr));
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if (!default_toolchain_dest)
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return Value();
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const SourceDir& current_dir = scope->GetSourceDir();
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const Label& default_toolchain = ToolchainLabelForScope(scope);
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if (!EnsureSingleStringArg(function, args, err))
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return Value();
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Label toolchain_label(
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Label::Resolve(current_dir, default_toolchain, args[0], err));
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if (toolchain_label.is_null())
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return Value();
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*default_toolchain_dest = toolchain_label;
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return Value();
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}
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} // namespace functions
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