BUILD.bazel

# Copyright lowRISC contributors.
# Licensed under the Apache License, Version 2.0, see LICENSE for details.
# SPDX-License-Identifier: Apache-2.0

load(
    "//config:features.bzl",
    "CPP_ALL_COMPILE_ACTIONS",
    "C_ALL_COMPILE_ACTIONS",
    "LD_ALL_ACTIONS",
    "feature",
    "feature_set",
    "feature_single_flag_c_cpp",
    "flag_group",
    "flag_set",
)

package(default_visibility = ["//visibility:public"])

feature(
    name = "runtime_type_information",
    enabled = True,
    flag_sets = [
        flag_set(
            actions = CPP_ALL_COMPILE_ACTIONS,
            flag_groups = [
                flag_group(
                    flags = [
                        # Disable RTTI
                        "-fno-rtti",
                    ],
                ),
            ],
        ),
    ],
)

feature(
    name = "exceptions",
    enabled = True,
    flag_sets = [
        flag_set(
            actions = CPP_ALL_COMPILE_ACTIONS,
            flag_groups = [
                flag_group(
                    flags = [
                        # Disable Exceptions
                        "-fno-exceptions",
                        "-fno-non-call-exceptions",
                    ],
                ),
            ],
        ),
    ],
)

feature(
    name = "cc_constructor_destructor",
    enabled = True,
    flag_sets = [
        flag_set(
            actions = CPP_ALL_COMPILE_ACTIONS + C_ALL_COMPILE_ACTIONS,
            flag_groups = [
                flag_group(
                    flags = [
                        # Indicate that this program may not neccesarily be able to use standard system calls
                        "-ffreestanding",
                        # Instantiate global variables only once
                        "-fno-common",
                        # Emits guards against functions that have references to local array definitions
                        "[STACK_PROTECTOR]",
                    ],
                ),
            ],
        ),
        flag_set(
            actions = CPP_ALL_COMPILE_ACTIONS,
            flag_groups = [
                flag_group(
                    flags = [
                        # Disable teardown/destructors for static variables
                        "-fno-use-cxa-atexit",
                        # Disable threadsafe statics
                        "-fno-threadsafe-statics",
                    ],
                ),
            ],
        ),
    ],
)

feature_single_flag_c_cpp(
    name = "clang_gnu_warnings",
    flag = "-Wgnu",
)

feature_single_flag_c_cpp(
    name = "no_gnu_zero_variadic_macro_arguments_warning",
    flag = "-Wno-gnu-zero-variadic-macro-arguments",
)

feature_single_flag_c_cpp(
    name = "no_gnu_statement_expression_from_macro_expansion",
    flag = "-Wno-gnu-statement-expression-from-macro-expansion",
)

feature_set(
    name = "embedded",
    feature = [
        "runtime_type_information",
        "exceptions",
        "cc_constructor_destructor",
        "clang_gnu_warnings",
        "no_gnu_zero_variadic_macro_arguments_warning",
        "no_gnu_statement_expression_from_macro_expansion",
    ],
    substitutions = {
        "[STACK_PROTECTOR]": "-fstack-protector-strong",
    },
)