pw_build/BUILD.gn

# Copyright 2019 The Pigweed Authors
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not
# use this file except in compliance with the License. You may obtain a copy of
# the License at
#
#     https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations under
# the License.

import("$dir_pw_docgen/docs.gni")

# The default config is applied to all targets in Pigweed's BUILDCONFIG.gn.
config("default") {
  configs = [
    ":debugging",
    ":reduced_size",
    ":strict_warnings",
  ]
}

config("debugging") {
  # Enable debug symbol generation. This has no effect on final code size.
  cflags = [ "-g" ]
}

# Standard compiler flags to reduce output binary size.
config("reduced_size") {
  cflags = [
    "-fno-common",
    "-fno-exceptions",
    "-ffunction-sections",
    "-fdata-sections",
  ]
  cflags_cc = [ "-fno-rtti" ]
}

config("strict_warnings") {
  cflags = [
    "-Wall",
    "-Wextra",

    # Make all warnings errors, except for the exemptions below.
    "-Werror",
    "-Wno-error=cpp",  # preprocessor #warning statement
    "-Wno-error=deprecated-declarations",  # [[deprecated]] attribute
  ]
  cflags_cc = [ "-Wnon-virtual-dtor" ]
}

# This config contains warnings that we don't necessarily recommend projects
# enable, but are enabled for upstream Pigweed for maximum project
# compatibility.
config("extra_strict_warnings") {
  cflags = [ "-Wshadow" ]
}

config("cpp11") {
  cflags_cc = [ "-std=c++11" ]
}

config("cpp14") {
  cflags_cc = [ "-std=c++14" ]
}

config("cpp17") {
  cflags_cc = [
    "-std=c++17",

    # Allow uses of the register keyword, which may appear in C headers.
    "-Wno-register",
  ]
}

pw_doc_group("docs") {
  sources = [ "docs.rst" ]
}

# Pool to limit a single thread to download external Go packages at a time.
pool("go_download_pool") {
  depth = 1
}