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8de802e221
In the same vein as https://reviews.llvm.org/D141553 Enable the feature globally to ensure layering and catch circular dependencies (https://llvm.org/docs/CodingStandards.html#library-layering). Differential Revision: https://reviews.llvm.org/D143678
194 lines
8.9 KiB
Plaintext
194 lines
8.9 KiB
Plaintext
# This file is licensed under the Apache License v2.0 with LLVM Exceptions.
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# See https://llvm.org/LICENSE.txt for license information.
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# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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###############################################################################
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# Common flags that apply to all configurations.
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# Use sparingly for things common to all compilers and platforms.
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###############################################################################
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# Prevent invalid caching if input files are modified during a build.
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build --experimental_guard_against_concurrent_changes
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# In opt mode, bazel by default builds both PIC and non-PIC object files for
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# tests vs binaries. We don't need this feature and it slows down opt builds
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# considerably.
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build --force_pic
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# Shared objects take up more space. With fast linkers and binaries that aren't
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# super large, the benefits of shared objects are minimal.
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build --dynamic_mode=off
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# Rely on compiler flags to compile with debug info/strip rather than stripping
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# based on compilation_mode.
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build --strip=never
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# Add layering check to all projects.
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build --features=layering_check
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###############################################################################
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# Options to select different strategies for linking potential dependent
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# libraries. The default leaves it disabled.
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###############################################################################
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build:zlib_external --repo_env=BAZEL_LLVM_ZLIB_STRATEGY=external
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build:zlib_system --repo_env=BAZEL_LLVM_ZLIB_STRATEGY=system
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build:terminfo_external --repo_env=BAZEL_LLVM_TERMINFO_STRATEGY=external
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build:terminfo_system --repo_env=BAZEL_LLVM_TERMINFO_STRATEGY=system
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###############################################################################
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# Options for "generic_clang" builds: these options should generally apply to
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# builds using a Clang-based compiler, and default to the `clang` executable on
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# the `PATH`. While these are provided for convenience and may serve as a
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# reference, it would be preferable for users to configure an explicit C++
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# toolchain instead of relying on `.bazelrc` files.
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###############################################################################
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# Set the default compiler to the `clang` binary on the `PATH`.
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build:generic_clang --repo_env=CC=clang
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# C++17 standard version is required.
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build:generic_clang --cxxopt=-std=c++17 --host_cxxopt=-std=c++17
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# Use `-Wall` for Clang.
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build:generic_clang --copt=-Wall --host_copt=-Wall
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# The Clang available on MacOS has a warning that isn't clean on MLIR code. The
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# warning doesn't show up with more recent Clangs, so just disable for now.
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build:generic_clang --cxxopt=-Wno-range-loop-analysis --host_cxxopt=-Wno-range-loop-analysis
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# Build errors are not a helpful way to enforce deprecation in-repo and it is
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# not the point of the Bazel build to catch usage of deprecated APIs.
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build:generic_clang --copt=-Wno-deprecated --host_copt=-Wno-deprecated
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# lld links faster than other linkers. Assume that anybody using clang also has
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# lld available.
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build:generic_clang --linkopt=-fuse-ld=lld --host_linkopt=-fuse-ld=lld
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###############################################################################
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# Options for "generic_gcc" builds: these options should generally apply to
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# builds using a GCC-based compiler, and default to the `gcc` executable on
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# the `PATH`. While these are provided for convenience and may serve as a
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# reference, it would be preferable for users to configure an explicit C++
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# toolchain instead of relying on `.bazelrc` files.
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###############################################################################
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# Set the default compiler to the `gcc` binary on the `PATH`.
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build:generic_gcc --repo_env=CC=gcc
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# C++17 standard version is required.
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build:generic_gcc --cxxopt=-std=c++17 --host_cxxopt=-std=c++17
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# Build errors are not a helpful way to enforce deprecation in-repo and it is
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# not the point of the Bazel build to catch usage of deprecated APIs.
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build:generic_gcc --copt=-Wno-deprecated --host_copt=-Wno-deprecated
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# Disable GCC warnings that are noisy and/or false positives on LLVM code.
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# These need to be global as some code triggering these is in header files.
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build:generic_gcc --copt=-Wno-unused-parameter --host_copt=-Wno-unused-parameter
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build:generic_gcc --copt=-Wno-comment --host_copt=-Wno-comment
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build:generic_gcc --cxxopt=-Wno-class-memaccess --host_cxxopt=-Wno-class-memaccess
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build:generic_gcc --copt=-Wno-maybe-uninitialized --host_copt=-Wno-maybe-uninitialized
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build:generic_gcc --copt=-Wno-misleading-indentation --host_copt=-Wno-misleading-indentation
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###############################################################################
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# Generic Windows flags common to both MSVC and Clang.
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###############################################################################
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# C++17 standard version is required.
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build:windows --cxxopt=/std:c++17 --host_cxxopt=/std:c++17
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# Other generic dialect flags.
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build:windows --copt=/Zc:strictStrings --host_copt=/Zc:strictStrings
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build:windows --copt=/Oi --host_copt=/Oi
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build:windows --cxxopt=/Zc:rvalueCast --host_cxxopt=/Zc:rvalueCast
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# Use the more flexible bigobj format for C++ files that have lots of symbols.
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build:windows --cxxopt=/bigobj --host_cxxopt=/bigobj
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###############################################################################
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# Windows specific flags for building with MSVC.
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###############################################################################
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build:msvc --config=windows
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build:msvc --copt=/WX --host_copt=/WX # Treat warnings as errors...
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# ...but disable the ones that are violated
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build:msvc --copt=/wd4141 --host_copt=/wd4141 # inline used more than once
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build:msvc --copt=/wd4244 --host_copt=/wd4244 # conversion type -> type
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build:msvc --copt=/wd4267 --host_copt=/wd4267 # conversion size_t -> type
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build:msvc --copt=/wd4273 --host_copt=/wd4273 # multiple definitions with different dllimport
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build:msvc --copt=/wd4319 --host_copt=/wd4319 # zero-extending after complement
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build:msvc --copt=/wd4624 --host_copt=/wd4624 # destructor was implicitly defined as deleted
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build:msvc --copt=/wd4804 --host_copt=/wd4804 # comparisons between bool and int
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build:msvc --copt=/wd4805 --host_copt=/wd4805 # comparisons between bool and int
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build:msvc --linkopt=/WX --host_linkopt=/WX # Treat warnings as errors...
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# ...but disable the ones that are violated.
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build:msvc --linkopt=/IGNORE:4001 --host_linkopt=/IGNORE:4001 # no object files
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###############################################################################
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# Options for Windows `clang-cl` builds.
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###############################################################################
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# We just start with the baseline Windows config as `clang-cl` doesn't accept
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# some of the generic Clang flags.
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build:clang-cl --config=windows
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# Switch from MSVC to the `clang-cl` compiler.
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build:clang-cl --compiler=clang-cl
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# Use Clang's internal warning flags instead of the ones that sometimes map
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# through to MSVC's flags.
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build:clang-cl --copt=/clang:-Wall --host_copt=/clang:-Wall
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build:clang-cl --copt=/clang:-Werror --host_copt=/clang:-Werror
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# This doesn't appear to be enforced by any upstream bot.
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build:clang-cl --copt=/clang:-Wno-unused --host_copt=/clang:-Wno-unused
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# There appears to be an unused constant in GoogleTest on Windows.
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build:clang-cl --copt=/clang:-Wno-unused-const-variable --host_copt=/clang:-Wno-unused-const-variable
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# Disable some warnings hit even with `clang-cl` in Clang's own code.
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build:clang-cl --copt=/clang:-Wno-inconsistent-dllimport --host_copt=/clang:-Wno-inconsistent-dllimport
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build:clang-cl --cxxopt=/clang:-Wno-c++11-narrowing --host_cxxopt=/clang:-Wno-c++11-narrowing
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###############################################################################
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# Options for continuous integration.
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###############################################################################
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# -O1 tries to provide a reasonable tradeoff between compile times and runtime
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# performance. However, if we start running more tests (e.g. all of
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# check-clang) we may want more optimizations.
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# Note for anybody considering using --compilation_mode=opt in CI, it builds
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# most files twice, one PIC version for shared libraries in tests, and one
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# non-PIC version for binaries.
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build:ci --copt=-O1
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# Use clang.
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build:ci --config=generic_clang
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# Speedup bazel using a ramdisk.
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build:ci --sandbox_base=/dev/shm
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# Use system's mpfr and pfm instead of building it from source.
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# This is non hermetic but helps with compile time.
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build:ci --@llvm-project//libc:mpfr=system
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build:ci --@llvm-project//llvm:pfm=system
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# Don't build/test targets tagged with "nobuildkite".
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build:ci --build_tag_filters=-nobuildkite
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build:ci --test_tag_filters=-nobuildkite
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# Show as many errors as possible.
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build:ci --keep_going
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# Show test errors.
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build:ci --test_output=errors
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###############################################################################
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# The user.bazelrc file is not checked in but available for local mods.
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# Always keep this at the end of the file so that user flags override.
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try-import %workspace%/user.bazelrc
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