blob: c14b984f36ceb035e1b3002d72df17377995faa6 [file] [log] [blame]
# 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")
import("$dir_pw_build/cc_blob_library.gni")
import("$dir_pw_build/python.gni")
import("$dir_pw_build/relative_source_file_names.gni")
import("$dir_pw_docgen/docs.gni")
import("$dir_pw_toolchain/traits.gni")
import("$dir_pw_unit_test/test.gni")
import("target_types.gni")
# IMPORTANT: The compilation flags in this file must be kept in sync with
# the CMake flags pw_build/CMakeLists.txt.
config("colorize_output") {
cflags = [
# Colorize output. Ninja's Clang invocation disables color by default.
"-fdiagnostics-color",
]
ldflags = cflags
}
config("debugging") {
# Enable debug symbol generation. This has no effect on final code size.
cflags = [ "-g" ]
}
config("extra_debugging") {
# Include things like macro expansion in debug info.
cflags = [ "-g3" ]
}
# Optimization levels
config("optimize_debugging") {
cflags = [ "-Og" ]
ldflags = cflags
}
config("optimize_speed") {
cflags = [ "-O2" ]
ldflags = cflags
}
config("optimize_more_speed") {
cflags = [ "-O3" ]
ldflags = cflags
}
config("optimize_size") {
cflags = [ "-Os" ]
ldflags = cflags
}
config("optimize_size_clang") {
cflags = [ "-Oz" ]
ldflags = cflags
}
# Standard compiler flags to reduce output binary size.
config("reduced_size") {
cflags = [
"-fno-common",
"-fno-exceptions",
"-ffunction-sections",
"-fdata-sections",
]
cflags_cc = [ "-fno-rtti" ]
if (current_os == "mac" || current_os == "ios") {
# Delete unreferenced sections. Helpful with -ffunction-sections.
ldflags = [ "-Wl,-dead_strip" ]
} else {
# Delete unreferenced sections. Helpful with -ffunction-sections.
ldflags = [ "-Wl,--gc-sections" ]
}
}
config("strict_warnings") {
cflags = [
"-Wall",
"-Wextra",
"-Wimplicit-fallthrough",
"-Wcast-qual",
"-Wundef",
"-Wpointer-arith",
# 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" ]
}
# Thread safety warnings are only supported by Clang.
config("clang_thread_safety_warnings") {
cflags = [ "-Wthread-safety" ]
defines = [ "_LIBCPP_ENABLE_THREAD_SAFETY_ANNOTATIONS=1" ]
}
# 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",
"-Wredundant-decls",
]
cflags_c = [ "-Wstrict-prototypes" ]
}
# This config contains warnings that are enabled for upstream Pigweed.
# This config MUST NOT be used downstream to allow for warnings to be
# added in the future without breaking downstream.
config("internal_strict_warnings") {
cflags = [ "-Wswitch-enum" ]
cflags_cc = [ "-Wextra-semi" ]
# TODO(b/243069432): Enable pedantic warnings on Windows when they pass.
if (host_os != "win") {
configs = [ ":pedantic_warnings" ]
}
}
config("pedantic_warnings") {
cflags = [
# Enable -Wpedantic, but disable a few warnings.
"-Wpedantic",
# Allow designated initializers, which were added in C++20 but widely
# supported prior and permitted by the Google style guide.
"-Wno-c++20-designator",
# Allow empty ... arguments in macros, which are permitted in C++20 but
# widely supported prior.
"-Wno-gnu-zero-variadic-macro-arguments",
]
if (pw_toolchain_CXX_STANDARD < pw_toolchain_STANDARD.CXX17) {
# Allow C++17 attributes in C++14, since Pigweed targets C++17 or newer.
cflags += [ "-Wno-c++17-attribute-extensions" ]
}
}
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",
]
}
config("cpp20") {
cflags_cc = [
"-std=c++20",
"-Wno-register",
]
}
# Selects the C++ standard to used based on the pw_toolchain_CXX_STANDARD
# toolchain trait.
config("toolchain_cpp_standard") {
if (pw_toolchain_CXX_STANDARD == pw_toolchain_STANDARD.CXX14) {
configs = [ ":cpp14" ]
} else if (pw_toolchain_CXX_STANDARD == pw_toolchain_STANDARD.CXX17) {
configs = [ ":cpp17" ]
} else if (pw_toolchain_CXX_STANDARD == pw_toolchain_STANDARD.CXX20) {
configs = [ ":cpp20" ]
} else {
assert(false,
"Unexpected pw_toolchain_CXX_STANDARD value: " +
pw_toolchain_CXX_STANDARD)
}
}
# Removes system-dependent prefixes from macros like __FILE__ and debug symbols.
config("relative_paths") {
_transformations = [
# Remap absolute paths to the build directory to "out", in case absolute
# paths to files in the build directory are created.
#
# Clang and GCC apply these flags in opposite order. The build directory is
# often nested under //. To ensure that both compilers removed it before
# removing the absolute path to //, apply the option both first and last.
rebase_path(root_build_dir) + "=out",
# Remove absolute paths to the repo root.
rebase_path("//") + "=",
# Remove relative paths from the build directory to the source tree.
rebase_path("//", root_build_dir) + "=",
# Repeat option to remap absolute paths to the build directory.
rebase_path(root_build_dir) + "=out",
]
cflags = []
foreach(transform, _transformations) {
cflags += [ "-ffile-prefix-map=" + transform ]
}
# Write the transformations to a well known path so that other utilities
# that need to present file names that match the compiler's __FILE__
# macro can apply the same transformation.
write_file(pw_build_RELATIVE_PATH_TRANSFORM_JSON, _transformations, "json")
}
# This group is linked into all pw_executable, pw_static_library, and
# pw_shared_library targets. This makes it possible to ensure symbols are
# defined without a dependency on them.
#
# pw_build_LINK_DEPS should only be used when necessary. For example,
# pw_assert relies on pw_build_LINK_DEPS to avoid circular dependencies
# in GN. In almost all other cases, build targets should explicitly depend on
# the other targets they use.
group("link_deps") {
deps = pw_build_LINK_DEPS
}
# This empty target is used as the default value for module configurations.
# Projects may set pw_build_DEFAULT_MODULE_CONFIG to a different GN target that
# overrides modules' configuration options via macro definitions or a header
# forcibly included with `-include`.
group("empty") {
}
pw_doc_group("docs") {
sources = [
"docs.rst",
"python.rst",
]
}
# Pigweed upstream does not use the default toolchain, but other projects may
# use it. To support using pw_build from the default toolchain without fully
# configuring the Pigweed build, only instantiate the pw_build tests for a
# non-default toolchain.
if (current_toolchain != default_toolchain) {
pw_test("cc_blob_library_test") {
sources = [ "cc_blob_library_test.cc" ]
deps = [ ":test_blob" ]
}
pw_cc_blob_library("test_blob") {
out_header = "pw_build/test_blob.h"
namespace = "test::ns"
blobs = [
{
file_path = "test_blob_0123.bin"
symbol_name = "kFirstBlob0123"
alignas = 512
},
{
file_path = "test_blob_0123.bin"
symbol_name = "kSecondBlob0123"
},
]
visibility = [ ":*" ]
}
pw_test_group("tests") {
tests = [ ":cc_blob_library_test" ]
}
}