xref: /aosp_15_r20/external/pigweed/pw_toolchain/cc/args/BUILD.bazel (revision 61c4878ac05f98d0ceed94b57d316916de578985) 
1# Copyright 2024 The Pigweed Authors
2#
3# Licensed under the Apache License, Version 2.0 (the "License"); you may not
4# use this file except in compliance with the License. You may obtain a copy of
5# the License at
6#
7#     https://www.apache.org/licenses/LICENSE-2.0
8#
9# Unless required by applicable law or agreed to in writing, software
10# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
11# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
12# License for the specific language governing permissions and limitations under
13# the License.
14
15load("@rules_cc//cc/toolchains:args.bzl", "cc_args")
16load("@rules_cc//cc/toolchains:feature.bzl", "cc_feature")
17
18package(default_visibility = ["//visibility:public"])
19
20# The common set of warnings for clang and arm_gcc.
21cc_args(
22    name = "common_warnings",
23    actions = [
24        "@rules_cc//cc/toolchains/actions:c_compile_actions",
25        "@rules_cc//cc/toolchains/actions:cpp_compile_actions",
26    ],
27    args = [
28        "-Wall",
29        "-Wextra",
30        "-Wimplicit-fallthrough",
31        "-Wcast-qual",
32        "-Wpointer-arith",
33        "-Wshadow",
34        "-Wredundant-decls",
35        # TODO: b/259746255 - Enable implicit conversion warnings once fixed.
36        # "-Wconversion",
37        # Make all warnings errors, except for the exemptions below.
38        "-Werror",
39        "-Wno-error=cpp",  # preprocessor #warning statement
40        "-Wno-error=deprecated-declarations",  # [[deprecated]] attribute
41    ],
42)
43
44# This config contains warnings that are enabled for upstream Pigweed.
45# This config MUST NOT be used downstream to allow for warnings to be
46# added in the future without breaking downstream.
47cc_args(
48    name = "internal_strict_warnings_flags",
49    actions = [
50        "@rules_cc//cc/toolchains/actions:c_compile_actions",
51        "@rules_cc//cc/toolchains/actions:cpp_compile_actions",
52    ],
53    args = [
54        "-Wswitch-enum",
55        "-Wextra-semi",
56    ] + select({
57        "@platforms//os:windows": [],
58        # TODO: b/243069432 - Enable pedantic warnings on Windows once passing.
59        "//conditions:default": [":pedantic_warnings"],
60    }),
61    visibility = ["//:__subpackages__"],
62)
63
64# Add `--features=internal_strict_warnings` to your Bazel invocation to enable.
65cc_feature(
66    name = "internal_strict_warnings",
67    args = [":internal_strict_warnings_flags"],
68    feature_name = "internal_strict_warnings",
69    visibility = ["//:__subpackages__"],
70)
71
72# Allow uses of the register keyword, which may appear in C headers.
73cc_args(
74    name = "wno_register",
75    actions = ["@rules_cc//cc/toolchains/actions:cpp_compile_actions"],
76    args = ["-Wno-register"],
77)
78
79# Issue a warning when a class appears to be polymorphic, yet it declares a
80# non-virtual destructor
81cc_args(
82    name = "wnon_virtual_dtor",
83    actions = ["@rules_cc//cc/toolchains/actions:cpp_compile_actions"],
84    args = ["-Wnon-virtual-dtor"],
85)
86
87# Prevent relative paths from being converted to absolute paths.
88cc_args(
89    name = "no_canonical_prefixes",
90    actions = [
91        "@rules_cc//cc/toolchains/actions:c_compile_actions",
92        "@rules_cc//cc/toolchains/actions:cpp_compile_actions",
93    ],
94    args = ["-no-canonical-prefixes"],
95)
96
97# Enables colors in compiler diagnostics. This uses the GCC spelling of the
98# flag, which Clang supports as an undocumented extension.
99cc_args(
100    name = "color_diagnostics",
101    actions = [
102        "@rules_cc//cc/toolchains/actions:assembly_actions",
103        "@rules_cc//cc/toolchains/actions:c_compile_actions",
104        "@rules_cc//cc/toolchains/actions:cpp_compile_actions",
105        "@rules_cc//cc/toolchains/actions:link_actions",
106    ],
107    args = ["-fdiagnostics-color"],
108)
109
110cc_args(
111    name = "debugging",
112    actions = [
113        "@rules_cc//cc/toolchains/actions:c_compile_actions",
114        "@rules_cc//cc/toolchains/actions:cpp_compile_actions",
115    ],
116    args = ["-g"],
117)
118
119# Compile without runtime type information (RTTI). This produces smaller binaries.
120cc_args(
121    name = "no_rtti",
122    actions = ["@rules_cc//cc/toolchains/actions:cpp_compile_actions"],
123    args = ["-fno-rtti"],
124)
125
126# Optimization level option
127cc_args(
128    name = "o2",
129    actions = [
130        "@rules_cc//cc/toolchains/actions:c_compile_actions",
131        "@rules_cc//cc/toolchains/actions:cpp_compile_actions",
132        "@rules_cc//cc/toolchains/actions:link_actions",
133    ],
134    args = ["-O2"],
135)
136
137# Optimization aggressively for size rather than speed option
138cc_args(
139    name = "oz",
140    actions = [
141        "@rules_cc//cc/toolchains/actions:c_compile_actions",
142        "@rules_cc//cc/toolchains/actions:cpp_compile_actions",
143        "@rules_cc//cc/toolchains/actions:link_actions",
144    ],
145    args = ["-Oz"],
146)
147
148# Standard compiler flags to reduce output binary size.
149cc_args(
150    name = "reduced_size",
151    actions = [
152        "@rules_cc//cc/toolchains/actions:c_compile_actions",
153        "@rules_cc//cc/toolchains/actions:cpp_compile_actions",
154        "@rules_cc//cc/toolchains/actions:link_actions",
155    ],
156    args = [
157        "-fno-common",
158        "-fno-exceptions",
159        "-ffunction-sections",
160        "-fdata-sections",
161    ],
162)
163
164cc_feature(
165    name = "c++17_feature",
166    args = [":c++17"],
167    feature_name = "c++17",
168)
169
170# Compile for the C++17 standard.
171cc_args(
172    name = "c++17",
173    actions = [
174        "@rules_cc//cc/toolchains/actions:cpp_compile_actions",
175        "@rules_cc//cc/toolchains/actions:link_actions",
176    ],
177    args = ["-std=c++17"],
178)
179
180cc_feature(
181    name = "c++20_feature",
182    args = [":c++20"],
183    feature_name = "c++20",
184)
185
186# Compile for the C++20 standard.
187cc_args(
188    name = "c++20",
189    actions = [
190        "@rules_cc//cc/toolchains/actions:cpp_compile_actions",
191        "@rules_cc//cc/toolchains/actions:link_actions",
192    ],
193    args = ["-std=c++20"],
194)
195
196cc_args(
197    name = "asan",
198    actions = [
199        "@rules_cc//cc/toolchains/actions:c_compile_actions",
200        "@rules_cc//cc/toolchains/actions:cpp_compile_actions",
201        "@rules_cc//cc/toolchains/actions:link_actions",
202    ],
203    args = [
204        "-fsanitize=address",
205        "-DADDRESS_SANITIZER",
206    ],
207)
208
209# TODO: https://pwbug.dev/346388161 - Push this to upstream rules_cc.
210cc_args(
211    name = "ubsan",
212    actions = [
213        "@rules_cc//cc/toolchains/actions:c_compile_actions",
214        "@rules_cc//cc/toolchains/actions:cpp_compile_actions",
215        "@rules_cc//cc/toolchains/actions:link_actions",
216    ],
217    args = [
218        "-fsanitize=undefined",
219        "-DUNDEFINED_SANITIZER",
220    ],
221)
222
223# TODO: https://pwbug.dev/346388161 - Push this to upstream rules_cc.
224cc_args(
225    name = "tsan",
226    actions = [
227        "@rules_cc//cc/toolchains/actions:c_compile_actions",
228        "@rules_cc//cc/toolchains/actions:cpp_compile_actions",
229        "@rules_cc//cc/toolchains/actions:link_actions",
230    ],
231    args = [
232        "-fsanitize=thread",
233        "-DTHREAD_SANITIZER",
234    ],
235)
236
237cc_args(
238    name = "fuzztest",
239    actions = [
240        "@rules_cc//cc/toolchains/actions:c_compile_actions",
241        "@rules_cc//cc/toolchains/actions:cpp_compile_actions",
242        "@rules_cc//cc/toolchains/actions:link_actions",
243    ],
244    args = [
245        "-DFUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION",
246        "-UNDEBUG",
247        "-D_LIBCPP_ENABLE_ASSERTIONS=1",
248    ] + select({
249        "@platforms//cpu:x86_64": ["-mcrc32"],
250        "//conditions:default": [],
251    }),
252)
253