| # 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. |
| |
| """Pigweed build environment for bazel.""" |
| |
| DEBUGGING = [ |
| "-g", |
| ] |
| |
| # Standard compiler flags to reduce output binary size. |
| REDUCED_SIZE_COPTS = [ |
| "-fno-common", |
| "-fno-exceptions", |
| "-ffunction-sections", |
| "-fdata-sections", |
| ] |
| |
| STRICT_WARNINGS_COPTS = [ |
| "-Wall", |
| "-Wextra", |
| # Make all warnings errors, except for the exemptions below. |
| "-Werror", |
| "-Wno-error=cpp", # preprocessor #warning statement |
| "-Wno-error=deprecated-declarations", # [[deprecated]] attribute |
| ] |
| |
| CPP17_COPTS = [ |
| "-std=c++17", |
| "-fno-rtti", |
| "-Wnon-virtual-dtor", |
| # Allow uses of the register keyword, which may appear in C headers. |
| "-Wno-register", |
| ] |
| |
| PW_DEFAULT_COPTS = ( |
| DEBUGGING + |
| REDUCED_SIZE_COPTS + |
| STRICT_WARNINGS_COPTS |
| ) |
| |
| PW_DEFAULT_LINKOPTS = [] |
| |
| def _add_defaults(kwargs): |
| """Adds default arguments suitable for both C and C++ code to kwargs.""" |
| |
| kwargs["copts"] = kwargs.get("copts", []) + PW_DEFAULT_COPTS |
| kwargs["linkopts"] = kwargs.get("linkopts", []) + PW_DEFAULT_LINKOPTS |
| |
| # Set linkstatic to avoid building .so files. |
| kwargs["linkstatic"] = True |
| |
| kwargs.setdefault("features", []) |
| |
| # Crosstool--adding this line to features disables header modules, which |
| # don't work with -fno-rtti. Note: this is not a command-line argument, |
| # it's "minus use_header_modules". |
| kwargs["features"].append("-use_header_modules") |
| |
| def _default_cc_and_c_kwargs(kwargs): |
| _add_defaults(kwargs) |
| kwargs.setdefault("srcs", []) |
| |
| cc = dict(kwargs.items()) |
| cc["srcs"] = [src for src in kwargs["srcs"] if not src.endswith(".c")] |
| cc["copts"] = cc["copts"] + CPP17_COPTS |
| |
| c_srcs = [src for src in kwargs["srcs"] if src.endswith(".c")] |
| |
| if c_srcs: |
| c = dict(kwargs.items()) |
| c["name"] += "_c" |
| c["srcs"] = c_srcs + [src for src in kwargs["srcs"] if src.endswith(".h")] |
| |
| cc["deps"] = cc.get("deps", []) + [":" + c["name"]] |
| return cc, c |
| |
| return cc, None |
| |
| def _add_cc_and_c_targets(target, kwargs): |
| cc_kwargs, c_kwargs = _default_cc_and_c_kwargs(kwargs) |
| |
| if c_kwargs: |
| native.cc_library(**c_kwargs) |
| |
| target(**cc_kwargs) |
| |
| def pw_cc_binary(**kwargs): |
| _add_cc_and_c_targets(native.cc_binary, kwargs) |
| |
| def pw_cc_library(**kwargs): |
| _add_cc_and_c_targets(native.cc_library, kwargs) |
| |
| def pw_cc_test(**kwargs): |
| kwargs["deps"] = kwargs.get("deps", []) + ["//pw_unit_test:main"] |
| _add_cc_and_c_targets(native.cc_test, kwargs) |