xref: /aosp_15_r20/external/cronet/third_party/abseil-cpp/absl/copts/copts.py (revision 6777b5387eb2ff775bb5750e3f5d96f37fb7352b) 
1"""Abseil compiler options.
2
3This is the source of truth for Abseil compiler options.  To modify Abseil
4compilation options:
5
6  (1) Edit the appropriate list in this file based on the platform the flag is
7      needed on.
8  (2) Run `<path_to_absl>/copts/generate_copts.py`.
9
10The generated copts are consumed by configure_copts.bzl and
11AbseilConfigureCopts.cmake.
12"""
13
14ABSL_GCC_FLAGS = [
15    "-Wall",
16    "-Wextra",
17    "-Wcast-qual",
18    "-Wconversion-null",
19    "-Wformat-security",
20    "-Wmissing-declarations",
21    "-Wnon-virtual-dtor",
22    "-Woverlength-strings",
23    "-Wpointer-arith",
24    "-Wundef",
25    "-Wunused-local-typedefs",
26    "-Wunused-result",
27    "-Wvarargs",
28    "-Wvla",  # variable-length array
29    "-Wwrite-strings",
30    # Don't define min and max macros (Build on Windows using gcc)
31    "-DNOMINMAX",
32]
33
34ABSL_GCC_TEST_ADDITIONAL_FLAGS = [
35    "-Wno-deprecated-declarations",
36    "-Wno-missing-declarations",
37    "-Wno-self-move",
38    "-Wno-sign-compare",
39    "-Wno-unused-function",
40    "-Wno-unused-parameter",
41    "-Wno-unused-private-field",
42]
43
44ABSL_LLVM_FLAGS = [
45    "-Wall",
46    "-Wextra",
47    "-Wc++98-compat-extra-semi",
48    "-Wcast-qual",
49    "-Wconversion",
50    "-Wdead-code-aggressive",
51    "-Wdeprecated-pragma",
52    "-Wfloat-overflow-conversion",
53    "-Wfloat-zero-conversion",
54    "-Wfor-loop-analysis",
55    "-Wformat-security",
56    "-Wgnu-redeclared-enum",
57    "-Winfinite-recursion",
58    "-Winvalid-constexpr",
59    "-Wliteral-conversion",
60    "-Wmissing-declarations",
61    "-Woverlength-strings",
62    "-Wpointer-arith",
63    "-Wself-assign",
64    "-Wshadow-all",
65    "-Wshorten-64-to-32",
66    "-Wsign-conversion",
67    "-Wstring-conversion",
68    "-Wtautological-overlap-compare",
69    "-Wtautological-unsigned-zero-compare",
70    "-Wundef",
71    "-Wuninitialized",
72    "-Wunreachable-code",
73    "-Wunused-comparison",
74    "-Wunused-local-typedefs",
75    "-Wunused-result",
76    "-Wvla",
77    "-Wwrite-strings",
78    # Warnings that are enabled by group warning flags like -Wall that we
79    # explicitly disable.
80    "-Wno-float-conversion",
81    "-Wno-implicit-float-conversion",
82    "-Wno-implicit-int-float-conversion",
83    # Disable warnings on unknown warning flags (when warning flags are
84    # unknown on older compiler versions)
85    "-Wno-unknown-warning-option",
86    # Don't define min and max macros (Build on Windows using clang)
87    "-DNOMINMAX",
88]
89
90ABSL_LLVM_TEST_ADDITIONAL_FLAGS = [
91    "-Wno-deprecated-declarations",
92    "-Wno-implicit-int-conversion",
93    "-Wno-missing-prototypes",
94    "-Wno-missing-variable-declarations",
95    "-Wno-shadow",
96    "-Wno-shorten-64-to-32",
97    "-Wno-sign-compare",
98    "-Wno-sign-conversion",
99    "-Wno-unreachable-code-loop-increment",
100    "-Wno-unused-function",
101    "-Wno-unused-member-function",
102    "-Wno-unused-parameter",
103    "-Wno-unused-private-field",
104    "-Wno-unused-template",
105    "-Wno-used-but-marked-unused",
106    # gtest depends on this GNU extension being offered.
107    "-Wno-gnu-zero-variadic-macro-arguments",
108]
109
110# /Wall with msvc includes unhelpful warnings such as C4711, C4710, ...
111MSVC_BIG_WARNING_FLAGS = [
112    "/W3",
113]
114
115MSVC_WARNING_FLAGS = [
116    # Increase the number of sections available in object files
117    "/bigobj",
118    "/wd4005",  # macro-redefinition
119    "/wd4068",  # unknown pragma
120    # qualifier applied to function type has no meaning; ignored
121    "/wd4180",
122    # conversion from 'type1' to 'type2', possible loss of data
123    "/wd4244",
124    # conversion from 'size_t' to 'type', possible loss of data
125    "/wd4267",
126    # The decorated name was longer than the compiler limit
127    "/wd4503",
128    # forcing value to bool 'true' or 'false' (performance warning)
129    "/wd4800",
130]
131
132MSVC_DEFINES = [
133    "/DNOMINMAX",  # Don't define min and max macros (windows.h)
134    # Don't bloat namespace with incompatible winsock versions.
135    "/DWIN32_LEAN_AND_MEAN",
136    # Don't warn about usage of insecure C functions.
137    "/D_CRT_SECURE_NO_WARNINGS",
138    "/D_SCL_SECURE_NO_WARNINGS",
139    # Introduced in VS 2017 15.8, allow overaligned types in aligned_storage
140    "/D_ENABLE_EXTENDED_ALIGNED_STORAGE",
141]
142
143
144def GccStyleFilterAndCombine(default_flags, test_flags):
145  """Merges default_flags and test_flags for GCC and LLVM.
146
147  Args:
148    default_flags: A list of default compiler flags
149    test_flags: A list of flags that are only used in tests
150
151  Returns:
152    A combined list of default_flags and test_flags, but with all flags of the
153    form '-Wwarning' removed if test_flags contains a flag of the form
154    '-Wno-warning'
155  """
156  remove = set(["-W" + f[5:] for f in test_flags if f[:5] == "-Wno-"])
157  return [f for f in default_flags if f not in remove] + test_flags
158
159COPT_VARS = {
160    "ABSL_GCC_FLAGS": ABSL_GCC_FLAGS,
161    "ABSL_GCC_TEST_FLAGS": GccStyleFilterAndCombine(
162        ABSL_GCC_FLAGS, ABSL_GCC_TEST_ADDITIONAL_FLAGS),
163    "ABSL_LLVM_FLAGS": ABSL_LLVM_FLAGS,
164    "ABSL_LLVM_TEST_FLAGS": GccStyleFilterAndCombine(
165        ABSL_LLVM_FLAGS, ABSL_LLVM_TEST_ADDITIONAL_FLAGS),
166    "ABSL_CLANG_CL_FLAGS":
167        MSVC_BIG_WARNING_FLAGS + MSVC_DEFINES,
168    "ABSL_CLANG_CL_TEST_FLAGS":
169        MSVC_BIG_WARNING_FLAGS + MSVC_DEFINES + ABSL_LLVM_TEST_ADDITIONAL_FLAGS,
170    "ABSL_MSVC_FLAGS":
171        MSVC_BIG_WARNING_FLAGS + MSVC_WARNING_FLAGS + MSVC_DEFINES,
172    "ABSL_MSVC_TEST_FLAGS":
173        MSVC_BIG_WARNING_FLAGS + MSVC_WARNING_FLAGS + MSVC_DEFINES + [
174            "/wd4018",  # signed/unsigned mismatch
175            "/wd4101",  # unreferenced local variable
176            "/wd4503",  # decorated name length exceeded, name was truncated
177            "/wd4996",  # use of deprecated symbol
178            "/DNOMINMAX",  # disable the min() and max() macros from <windows.h>
179        ],
180    "ABSL_MSVC_LINKOPTS": [
181        # Object file doesn't export any previously undefined symbols
182        "-ignore:4221",
183    ],
184    # "HWAES" is an abbreviation for "hardware AES" (AES - Advanced Encryption
185    # Standard). These flags are used for detecting whether or not the target
186    # architecture has hardware support for AES instructions which can be used
187    # to improve performance of some random bit generators.
188    "ABSL_RANDOM_HWAES_ARM64_FLAGS": ["-march=armv8-a+crypto"],
189    "ABSL_RANDOM_HWAES_ARM32_FLAGS": ["-mfpu=neon"],
190    "ABSL_RANDOM_HWAES_X64_FLAGS": [
191        "-maes",
192        "-msse4.1",
193    ],
194    "ABSL_RANDOM_HWAES_MSVC_X64_FLAGS": [],
195}
196