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 "-Wdeprecated-pragma", 51 "-Wfloat-overflow-conversion", 52 "-Wfloat-zero-conversion", 53 "-Wfor-loop-analysis", 54 "-Wformat-security", 55 "-Wgnu-redeclared-enum", 56 "-Winfinite-recursion", 57 "-Winvalid-constexpr", 58 "-Wliteral-conversion", 59 "-Wmissing-declarations", 60 "-Woverlength-strings", 61 "-Wpointer-arith", 62 "-Wself-assign", 63 "-Wshadow-all", 64 "-Wshorten-64-to-32", 65 "-Wsign-conversion", 66 "-Wstring-conversion", 67 "-Wtautological-overlap-compare", 68 "-Wtautological-unsigned-zero-compare", 69 "-Wundef", 70 "-Wuninitialized", 71 "-Wunreachable-code", 72 "-Wunused-comparison", 73 "-Wunused-local-typedefs", 74 "-Wunused-result", 75 "-Wvla", 76 "-Wwrite-strings", 77 # Warnings that are enabled by group warning flags like -Wall that we 78 # explicitly disable. 79 "-Wno-float-conversion", 80 "-Wno-implicit-float-conversion", 81 "-Wno-implicit-int-float-conversion", 82 # Disable warnings on unknown warning flags (when warning flags are 83 # unknown on older compiler versions) 84 "-Wno-unknown-warning-option", 85 # Don't define min and max macros (Build on Windows using clang) 86 "-DNOMINMAX", 87] 88 89ABSL_LLVM_TEST_ADDITIONAL_FLAGS = [ 90 "-Wno-deprecated-declarations", 91 "-Wno-implicit-int-conversion", 92 "-Wno-missing-prototypes", 93 "-Wno-missing-variable-declarations", 94 "-Wno-shadow", 95 "-Wno-shorten-64-to-32", 96 "-Wno-sign-compare", 97 "-Wno-sign-conversion", 98 "-Wno-unreachable-code-loop-increment", 99 "-Wno-unused-function", 100 "-Wno-unused-member-function", 101 "-Wno-unused-parameter", 102 "-Wno-unused-private-field", 103 "-Wno-unused-template", 104 "-Wno-used-but-marked-unused", 105 # gtest depends on this GNU extension being offered. 106 "-Wno-gnu-zero-variadic-macro-arguments", 107] 108 109# /Wall with msvc includes unhelpful warnings such as C4711, C4710, ... 110MSVC_BIG_WARNING_FLAGS = [ 111 "/W3", 112] 113 114MSVC_WARNING_FLAGS = [ 115 # Increase the number of sections available in object files 116 "/bigobj", 117 "/wd4005", # macro-redefinition 118 "/wd4068", # unknown pragma 119 # qualifier applied to function type has no meaning; ignored 120 "/wd4180", 121 # The decorated name was longer than the compiler limit 122 "/wd4503", 123 # forcing value to bool 'true' or 'false' (performance warning) 124 "/wd4800", 125] 126 127MSVC_DEFINES = [ 128 "/DNOMINMAX", # Don't define min and max macros (windows.h) 129 # Don't bloat namespace with incompatible winsock versions. 130 "/DWIN32_LEAN_AND_MEAN", 131 # Don't warn about usage of insecure C functions. 132 "/D_CRT_SECURE_NO_WARNINGS", 133 "/D_SCL_SECURE_NO_WARNINGS", 134 # Introduced in VS 2017 15.8, allow overaligned types in aligned_storage 135 "/D_ENABLE_EXTENDED_ALIGNED_STORAGE", 136] 137 138 139def GccStyleFilterAndCombine(default_flags, test_flags): 140 """Merges default_flags and test_flags for GCC and LLVM. 141 142 Args: 143 default_flags: A list of default compiler flags 144 test_flags: A list of flags that are only used in tests 145 146 Returns: 147 A combined list of default_flags and test_flags, but with all flags of the 148 form '-Wwarning' removed if test_flags contains a flag of the form 149 '-Wno-warning' 150 """ 151 remove = set(["-W" + f[5:] for f in test_flags if f[:5] == "-Wno-"]) 152 return [f for f in default_flags if f not in remove] + test_flags 153 154COPT_VARS = { 155 "ABSL_GCC_FLAGS": ABSL_GCC_FLAGS, 156 "ABSL_GCC_TEST_FLAGS": GccStyleFilterAndCombine( 157 ABSL_GCC_FLAGS, ABSL_GCC_TEST_ADDITIONAL_FLAGS 158 ), 159 "ABSL_LLVM_FLAGS": ABSL_LLVM_FLAGS, 160 "ABSL_LLVM_TEST_FLAGS": GccStyleFilterAndCombine( 161 ABSL_LLVM_FLAGS, ABSL_LLVM_TEST_ADDITIONAL_FLAGS 162 ), 163 "ABSL_CLANG_CL_FLAGS": MSVC_BIG_WARNING_FLAGS + MSVC_DEFINES, 164 "ABSL_CLANG_CL_TEST_FLAGS": ( 165 MSVC_BIG_WARNING_FLAGS + MSVC_DEFINES + ABSL_LLVM_TEST_ADDITIONAL_FLAGS 166 ), 167 "ABSL_MSVC_FLAGS": ( 168 MSVC_BIG_WARNING_FLAGS + MSVC_WARNING_FLAGS + MSVC_DEFINES 169 ), 170 "ABSL_MSVC_TEST_FLAGS": ( 171 MSVC_BIG_WARNING_FLAGS 172 + MSVC_WARNING_FLAGS 173 + MSVC_DEFINES 174 + [ 175 "/wd4018", # signed/unsigned mismatch 176 "/wd4101", # unreferenced local variable 177 "/wd4244", # shortening conversion 178 "/wd4267", # shortening conversion 179 "/wd4503", # decorated name length exceeded, name was truncated 180 "/wd4996", # use of deprecated symbol 181 "/DNOMINMAX", # disable the min() and max() macros from <windows.h> 182 ] 183 ), 184 "ABSL_MSVC_LINKOPTS": [ 185 # Object file doesn't export any previously undefined symbols 186 "-ignore:4221", 187 ], 188} 189