4aa77690b9
We used to have `pfm` built into exegesis, although since it's an external dependency we marked it as a manual target. Because of this we didn't have buildbot coverage and so we removed it in D134510 after we had a few breakages that weren't caught. This adds it back, but with three possible states similar to the story with `mpfr`, i.e. it can either be disabled, built from external sources (git/make), or use whatever `-lpfm` is installed on the system. This change is modeled after D119547. Like that patch, the default is off (matching the status quo), but unlike that patch we don't enable it for CI because IIRC we don't have the package installed there, and building from source might be expensive. We could enable it later either after installing it on buildbot machines or by measuring build cost and deeming it OK. Reviewed By: GMNGeoffrey Differential Revision: https://reviews.llvm.org/D138470
191 lines
8.9 KiB
Plaintext
191 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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###############################################################################
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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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