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# Copyright 2016 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
# Compile a flatbuffer.
#
# flatc_out_dir (optional)
# Specifies the path suffix that output files are generated under. This
# path will be appended to root_gen_dir.
#
# Targets that depend on the flatbuffer target will be able to include
# the resulting FlatBuffers header with an include like:
# #include "dir/for/my_flatbuffer/buffer_generated.h"
# If undefined, this defaults to matchign the input directory for each
# .fbs file (you should almost always use the default mode).
#
# flatc_include_dirs (optional)
# Specifies the directories which FlatBuffers compiler uses to find
# included .fbs files in. Almost always should be empty.
#
# The list always has an implicit first item corresponding to the root of
# the source tree. This enables including .fbs files by absolute path.
#
# The compiler will try the directories in the order given, and if all
# fail it will try to load relative to the directory of the schema file
# being parsed.
#
# mutable (optional)
# Boolean to compile flatbuffers with the "--gen-mutable" argument, which
# generates non-const accessors for mutating FlatBuffers in-place.
#
# deps (optional)
# Additional dependencies.
#
# Parameters for compiling the generated code:
#
# defines (optional)
# Defines to supply to the source set that compiles the generated source
# code.
#
# extra_configs (optional)
# A list of config labels that will be appended to the configs applying
# to the source set.
#
# testonly (optional)
# Boolean to indicate whether the generated source sets should be labeled
# as testonly.
#
# Example:
# flatbuffer("mylib") {
# sources = [
# "foo.fbs",
# ]
# }
import("//build/compiled_action.gni")
template("flatbuffer") {
assert(defined(invoker.sources), "Need sources for flatbuffers_library")
action_name = "${target_name}_gen"
source_set_name = target_name
compiled_action_foreach(action_name) {
visibility = [ ":$source_set_name" ]
tool = "//third_party/flatbuffers:flatc"
sources = invoker.sources
deps = []
if (defined(invoker.flatc_out_dir)) {
out_dir = "$root_gen_dir/" + invoker.flatc_out_dir
} else {
out_dir = "{{source_gen_dir}}"
}
outputs = [ "$out_dir/{{source_name_part}}_generated.h" ]
args = [
"-c",
"--keep-prefix",
"-o",
"$out_dir",
"-I",
rebase_path("//", root_build_dir),
]
if (defined(invoker.flatc_include_dirs)) {
foreach(include_dir, invoker.flatc_include_dirs) {
args += [
"-I",
rebase_path(include_dir, root_build_dir),
]
}
}
if (defined(invoker.mutable) && invoker.mutable) {
args += [ "--gen-mutable" ]
}
if (defined(invoker.args)) {
args += invoker.args
}
args += [ "{{source}}" ]
# The deps may have steps that have to run before running flatc.
if (defined(invoker.deps)) {
deps += invoker.deps
}
}
source_set(target_name) {
forward_variables_from(invoker,
[
"visibility",
"defines",
])
sources = get_target_outputs(":$action_name")
if (defined(invoker.extra_configs)) {
configs += invoker.extra_configs
}
if (defined(invoker.testonly)) {
testonly = invoker.testonly
}
public_configs = [ "//third_party/flatbuffers:flatbuffers_config" ]
public_deps = [
# The generated headers reference headers within FlatBuffers, so
# dependencies must be able to find those headers too.
":$action_name",
"//third_party/flatbuffers",
]
# This will link any libraries in the deps (the use of invoker.deps in the
# action won't link it).
if (defined(invoker.deps)) {
deps = invoker.deps
}
# Same for public_deps.
if (defined(invoker.public_deps)) {
public_deps += invoker.public_deps
}
}
}
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