1 # This file is licensed under the Apache License v2.0 with LLVM Exceptions.
2 # See https://llvm.org/LICENSE.txt for license information.
3 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
5 ###############################################################################
6 # Common flags that apply to all configurations.
7 # Use sparingly for things common to all compilers and platforms.
8 ###############################################################################
9 # Prevent invalid caching if input files are modified during a build.
10 build --experimental_guard_against_concurrent_changes
12 # Automatically enable --config=(linux|macos|windows) based on the host
13 build --enable_platform_specific_config
15 # In opt mode, bazel by default builds both PIC and non-PIC object files for
16 # tests vs binaries. We don't need this feature and it slows down opt builds
18 # TODO: Remove platform specifics we're on bazel 7.x https://github.com/bazelbuild/bazel/issues/12439
19 # Apple platforms always enable pic so this flag is unnecessary anyways
20 build:linux --force_pic
21 build:windows --force_pic
23 # Shared objects take up more space. With fast linkers and binaries that aren't
24 # super large, the benefits of shared objects are minimal.
25 build --dynamic_mode=off
27 # Rely on compiler flags to compile with debug info/strip rather than stripping
28 # based on compilation_mode.
31 # Add layering check to all projects.
32 build --features=layering_check
34 # Opt out of legacy lax behavior implicitly exporting files that are rule inputs
35 # with default visibility.
36 # See: https://bazel.build/reference/be/functions#exports_files
37 build --incompatible_no_implicit_file_export
39 # Enable so downstream users can flip this flag globally, this should
40 # eventually become the default
41 common --incompatible_disallow_empty_glob
43 # TODO: Remove once we move to bazel 7.x
44 build --experimental_cc_shared_library
46 ###############################################################################
47 # Options to select different strategies for linking potential dependent
48 # libraries. The default leaves it disabled.
49 ###############################################################################
51 build:zlib_external --repo_env=BAZEL_LLVM_ZLIB_STRATEGY=external
52 build:zlib_system --repo_env=BAZEL_LLVM_ZLIB_STRATEGY=system
54 ###############################################################################
55 # Options for "generic_clang" builds: these options should generally apply to
56 # builds using a Clang-based compiler, and default to the `clang` executable on
57 # the `PATH`. While these are provided for convenience and may serve as a
58 # reference, it would be preferable for users to configure an explicit C++
59 # toolchain instead of relying on `.bazelrc` files.
60 ###############################################################################
62 # Set the default compiler to the `clang` binary on the `PATH`.
63 build:generic_clang --repo_env=CC=clang
65 # C++17 standard version is required.
66 build:generic_clang --cxxopt=-std=c++17 --host_cxxopt=-std=c++17
68 # Use `-Wall` for Clang.
69 build:generic_clang --copt=-Wall --host_copt=-Wall
71 # The Clang available on MacOS has a warning that isn't clean on MLIR code. The
72 # warning doesn't show up with more recent Clangs, so just disable for now.
73 build:generic_clang --cxxopt=-Wno-range-loop-analysis --host_cxxopt=-Wno-range-loop-analysis
75 # Build errors are not a helpful way to enforce deprecation in-repo and it is
76 # not the point of the Bazel build to catch usage of deprecated APIs.
77 build:generic_clang --copt=-Wno-deprecated --host_copt=-Wno-deprecated
79 # lld links faster than other linkers. Assume that anybody using clang also has
81 build:generic_clang --linkopt=-fuse-ld=lld --host_linkopt=-fuse-ld=lld
83 ###############################################################################
84 # Options for "generic_gcc" builds: these options should generally apply to
85 # builds using a GCC-based compiler, and default to the `gcc` executable on
86 # the `PATH`. While these are provided for convenience and may serve as a
87 # reference, it would be preferable for users to configure an explicit C++
88 # toolchain instead of relying on `.bazelrc` files.
89 ###############################################################################
91 # Set the default compiler to the `gcc` binary on the `PATH`.
92 build:generic_gcc --repo_env=CC=gcc
94 # C++17 standard version is required.
95 build:generic_gcc --cxxopt=-std=c++17 --host_cxxopt=-std=c++17
97 # Build errors are not a helpful way to enforce deprecation in-repo and it is
98 # not the point of the Bazel build to catch usage of deprecated APIs.
99 build:generic_gcc --copt=-Wno-deprecated --host_copt=-Wno-deprecated
101 # Disable GCC warnings that are noisy and/or false positives on LLVM code.
102 # These need to be global as some code triggering these is in header files.
103 build:generic_gcc --copt=-Wno-unused-parameter --host_copt=-Wno-unused-parameter
104 build:generic_gcc --copt=-Wno-comment --host_copt=-Wno-comment
105 build:generic_gcc --cxxopt=-Wno-class-memaccess --host_cxxopt=-Wno-class-memaccess
106 build:generic_gcc --copt=-Wno-maybe-uninitialized --host_copt=-Wno-maybe-uninitialized
107 build:generic_gcc --copt=-Wno-misleading-indentation --host_copt=-Wno-misleading-indentation
109 ###############################################################################
110 # Generic Windows flags common to both MSVC and Clang.
111 ###############################################################################
113 # C++17 standard version is required.
114 build:windows --cxxopt=/std:c++17 --host_cxxopt=/std:c++17
116 # Other generic dialect flags.
117 build:windows --copt=/Zc:strictStrings --host_copt=/Zc:strictStrings
118 build:windows --copt=/Oi --host_copt=/Oi
119 build:windows --cxxopt=/Zc:rvalueCast --host_cxxopt=/Zc:rvalueCast
121 # Use the more flexible bigobj format for C++ files that have lots of symbols.
122 build:windows --cxxopt=/bigobj --host_cxxopt=/bigobj
124 ###############################################################################
125 # Windows specific flags for building with MSVC.
126 ###############################################################################
128 build:msvc --config=windows
130 build:msvc --copt=/WX --host_copt=/WX # Treat warnings as errors...
131 # ...but disable the ones that are violated
132 build:msvc --copt=/wd4141 --host_copt=/wd4141 # inline used more than once
133 build:msvc --copt=/wd4244 --host_copt=/wd4244 # conversion type -> type
134 build:msvc --copt=/wd4267 --host_copt=/wd4267 # conversion size_t -> type
135 build:msvc --copt=/wd4273 --host_copt=/wd4273 # multiple definitions with different dllimport
136 build:msvc --copt=/wd4319 --host_copt=/wd4319 # zero-extending after complement
137 build:msvc --copt=/wd4624 --host_copt=/wd4624 # destructor was implicitly defined as deleted
138 build:msvc --copt=/wd4804 --host_copt=/wd4804 # comparisons between bool and int
139 build:msvc --copt=/wd4805 --host_copt=/wd4805 # comparisons between bool and int
141 build:msvc --linkopt=/WX --host_linkopt=/WX # Treat warnings as errors...
142 # ...but disable the ones that are violated.
143 build:msvc --linkopt=/IGNORE:4001 --host_linkopt=/IGNORE:4001 # no object files
145 ###############################################################################
146 # Options for Windows `clang-cl` builds.
147 ###############################################################################
149 # We just start with the baseline Windows config as `clang-cl` doesn't accept
150 # some of the generic Clang flags.
151 build:clang-cl --config=windows
153 # Switch from MSVC to the `clang-cl` compiler.
154 build:clang-cl --compiler=clang-cl
156 # Use Clang's internal warning flags instead of the ones that sometimes map
157 # through to MSVC's flags.
158 build:clang-cl --copt=/clang:-Wall --host_copt=/clang:-Wall
159 build:clang-cl --copt=/clang:-Werror --host_copt=/clang:-Werror
161 # This doesn't appear to be enforced by any upstream bot.
162 build:clang-cl --copt=/clang:-Wno-unused --host_copt=/clang:-Wno-unused
164 # There appears to be an unused constant in GoogleTest on Windows.
165 build:clang-cl --copt=/clang:-Wno-unused-const-variable --host_copt=/clang:-Wno-unused-const-variable
167 # Disable some warnings hit even with `clang-cl` in Clang's own code.
168 build:clang-cl --copt=/clang:-Wno-inconsistent-dllimport --host_copt=/clang:-Wno-inconsistent-dllimport
169 build:clang-cl --cxxopt=/clang:-Wno-c++11-narrowing --host_cxxopt=/clang:-Wno-c++11-narrowing
171 ###############################################################################
172 # Options for continuous integration.
173 ###############################################################################
175 # -O1 tries to provide a reasonable tradeoff between compile times and runtime
176 # performance. However, if we start running more tests (e.g. all of
177 # check-clang) we may want more optimizations.
178 # Note for anybody considering using --compilation_mode=opt in CI, it builds
179 # most files twice, one PIC version for shared libraries in tests, and one
180 # non-PIC version for binaries.
184 build:ci --config=generic_clang
186 # Speedup bazel using a ramdisk.
187 build:ci --sandbox_base=/dev/shm
189 # Use system's mpfr and pfm instead of building it from source.
190 # This is non hermetic but helps with compile time.
191 build:ci --@llvm-project//libc:mpfr=system
192 build:ci --@llvm-project//llvm:pfm=system
194 # Don't build/test targets tagged with "nobuildkite".
195 build:ci --build_tag_filters=-nobuildkite
196 build:ci --test_tag_filters=-nobuildkite
198 # Show as many errors as possible.
199 build:ci --keep_going
202 build:ci --test_output=errors
204 # Only show failing tests to reduce output
205 build:ci --test_summary=terse
207 ###############################################################################
209 # The user.bazelrc file is not checked in but available for local mods.
210 # Always keep this at the end of the file so that user flags override.
211 try-import %workspace%/user.bazelrc