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# Copyright 2014 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.
# This file introduces two related templates that act like action and
# action_foreach but instead of running a Python script, it will compile a
# given tool in the host toolchain and run that (either once or over the list
# of inputs, depending on the variant).
#
# Parameters
#
# tool (required)
# [label] Label of the tool to run. This should be an executable, and
# this label should not include a toolchain (anything in parens). The
# host compile of this tool will be used.
#
# outputs (required)
# [list of files] Like the outputs of action (if using "compiled_action",
# this would be just the list of outputs), or action_foreach (if using
# "compiled_action_foreach", this would contain source expansions mapping
# input to output files).
#
# args (required)
# [list of strings] Same meaning as action/action_foreach.
#
# inputs (optional)
# Files the binary takes as input. The step will be re-run whenever any
# of these change. If inputs is empty, the step will run only when the
# binary itself changes.
#
# visibility
# deps
# args (all optional)
# Same meaning as action/action_foreach.
#
#
# Example of usage:
#
# compiled_action("run_my_tool") {
# tool = "//tools/something:mytool"
# outputs = [
# "$target_gen_dir/mysource.cc",
# "$target_gen_dir/mysource.h",
# ]
#
# # The tool takes this input.
# inputs = [ "my_input_file.idl" ]
#
# # In this case, the tool takes as arguments the input file and the output
# # build dir (both relative to the "cd" that the script will be run in)
# # and will produce the output files listed above.
# args = [
# rebase_path("my_input_file.idl", root_build_dir),
# "--output-dir", rebase_path(target_gen_dir, root_build_dir),
# ]
# }
#
# You would typically declare your tool like this:
# if (host_toolchain == current_toolchain) {
# executable("mytool") {
# ...
# }
# }
# The if statement around the executable is optional. That says "I only care
# about this target in the host toolchain". Usually this is what you want, and
# saves unnecessarily compiling your tool for the target platform. But if you
# need a target build of your tool as well, just leave off the if statement.
if (host_os == "win") {
_host_executable_suffix = ".exe"
} else {
_host_executable_suffix = ""
}
template("compiled_action") {
assert(defined(invoker.tool), "tool must be defined for $target_name")
assert(defined(invoker.outputs), "outputs must be defined for $target_name")
assert(defined(invoker.args), "args must be defined for $target_name")
assert(!defined(invoker.sources),
"compiled_action doesn't take a sources arg. Use inputs instead.")
action(target_name) {
deps = []
inputs = []
forward_variables_from(invoker,
[
"deps",
"inputs",
"outputs",
"testonly",
"visibility",
])
script = "//build/gn_run_binary.py"
# Constuct the host toolchain version of the tool.
host_tool = invoker.tool + "($host_toolchain)"
# Get the path to the executable. Currently, this assumes that the tool
# does not specify output_name so that the target name is the name to use.
# If that's not the case, we'll need another argument to the script to
# specify this, since we can't know what the output name is (it might be in
# another file not processed yet).
host_executable =
get_label_info(host_tool, "root_out_dir") + "/" +
get_label_info(host_tool, "name") + _host_executable_suffix
# Add the executable itself as an input.
inputs += [ host_executable ]
deps += [ host_tool ]
# The script takes as arguments the binary to run, and then the arguments
# to pass it.
args = [ rebase_path(host_executable, root_build_dir) ] + invoker.args
}
}
template("compiled_action_foreach") {
assert(defined(invoker.sources), "sources must be defined for $target_name")
assert(defined(invoker.tool), "tool must be defined for $target_name")
assert(defined(invoker.outputs), "outputs must be defined for $target_name")
assert(defined(invoker.args), "args must be defined for $target_name")
action_foreach(target_name) {
deps = []
inputs = []
forward_variables_from(invoker,
[
"deps",
"inputs",
"outputs",
"sources",
"testonly",
"visibility",
])
script = "//build/gn_run_binary.py"
# Constuct the host toolchain version of the tool.
host_tool = invoker.tool + "($host_toolchain)"
# Get the path to the executable. Currently, this assumes that the tool
# does not specify output_name so that the target name is the name to use.
# If that's not the case, we'll need another argument to the script to
# specify this, since we can't know what the output name is (it might be in
# another file not processed yet).
host_executable =
get_label_info(host_tool, "root_out_dir") + "/" +
get_label_info(host_tool, "name") + _host_executable_suffix
# Add the executable itself as an input.
inputs += [ host_executable ]
deps += [ host_tool ]
# The script takes as arguments the binary to run, and then the arguments
# to pass it.
args = [ rebase_path(host_executable, root_build_dir) ] + invoker.args
}
}
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