pw_toolchain/host_gcc/BUILD.gn

# Copyright 2020 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("//build_overrides/pigweed.gni")

# Disable obnoxious ABI warning.
#
# GCC 7.1 adds an over-zealous ABI warning with little useful information
# on how to resolve the issue. The warning you get is:
#
#   note: parameter passing for argument of type '...' changed in GCC 7.1
#
# There is no other information, and searching for the error is needed to
# understand what is happening. For upstream Pigweed, we compile from
# source so this is irrelevant; so disable it.
#
# See: https://gcc.gnu.org/gcc-7/changes.html (search for "psabi").
#      https://gcc.gnu.org/ml/gcc/2017-05/msg00073.html
config("disable_psabi_warning") {
  cflags = [ "-Wno-psabi" ]
}

config("mingw_z_format") {
  if (host_os == "win") {
    # MinGW can't handle %z format specifiers without this flag enabled. This
    # flag is deprecated in future versions of MinGW, and should be replaced by
    # setting __MINGW_FEATURES__=__MINGW_ANSI_STDIO__ when switching to a
    # version of MinGW that uses the new flags.
    cflags = [ "-D__USE_MINGW_ANSI_STDIO=1" ]
  }
}

# GCC needs the -pthread option to support multithreading. This must be
# specified to build e.g. pw_thread_stl.
config("threading_support") {
  ldflags = [ "-pthread" ]
}