Use configuration flags for //src/conditions:darwin_arm64 #12653
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Partially reverts 6d637f4, to allow cross-compiling Bazel from darwin_x86_64 to darwin_arm64 with the `--cpu=darwin_arm64` flag. The only source that is different between darwin_x86_64 and darwin_arm64 now is the embedded JDK.
katre
reviewed
Dec 7, 2020
| "@platforms//os:macos", | ||
| "@platforms//cpu:arm64", | ||
| ], | ||
| values = {"cpu": "darwin_arm64"}, |
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Instead of removing the constraint version entirely, use https://github.com/bazelbuild/bazel-skylib/blob/master/docs/selects_doc.md#selectsconfig_setting_group to use either setting.
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Shouldn't whatever you're doing already work by setting both --cpu and --platforms=//:target with platform(name="target", constraint_values=[ "@platforms//os:macos", "@platforms//cpu:arm64"])?
I don't know what state of CC crosscompilation platformization is. But specifying both platform and flags should get you to the same state as before conditions package was modified.
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Building with both --cpu=darwin_arm64 and --platforms=//:target gets me this:
INFO: Invocation ID: 7514df6d-c786-4d10-8592-179657b0750b
DEBUG: /private/var/tmp/_bazel_admin/058bf0aeee6f9b65e93a9de41f4a4c2c/external/bazel_toolchains/rules/rbe_repo/checked_in.bzl:103:14: rbe_ubuntu1804_java11 not using checked in configs as detect_java_home was set to True
DEBUG: /private/var/tmp/_bazel_admin/058bf0aeee6f9b65e93a9de41f4a4c2c/external/bazel_toolchains/rules/rbe_repo/checked_in.bzl:103:14: rbe_ubuntu1604_java8 not using checked in configs as detect_java_home was set to True
INFO: Build option --platforms has changed, discarding analysis cache.
ERROR: While resolving toolchains for target //src/main/cpp:client: No matching toolchains found for types @bazel_tools//tools/cpp:toolchain_type. Maybe --incompatible_use_cc_configure_from_rules_cc has been flipped and there is no default C++ toolchain added in the WORKSPACE file? See https://github.com/bazelbuild/bazel/issues/10134 for details and migration instructions.
ERROR: Analysis of target '//src:bazel' failed; build aborted: No matching toolchains found for types @bazel_tools//tools/cpp:toolchain_type. Maybe --incompatible_use_cc_configure_from_rules_cc has been flipped and there is no default C++ toolchain added in the WORKSPACE file? See https://github.com/bazelbuild/bazel/issues/10134 for details and migration instructions.
INFO: Elapsed time: 0.475s
INFO: 0 processes.
FAILED: Build did NOT complete successfully (47 packages loaded, 179 targets configured)
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Looks like the dummy cc toolchain isn't being picked up. Would you mind filing this as a separate issue so I can investigate? This PR looks fine to me with the recent change
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I'd rather see the problem with dummy cc toolchain fixed than a workaroud.
What happens if you set --incompatible_enable_cc_toolchain_resolution?
Please at least open an issue for dummy cc toolchain and add a TODO here, that is
TODO(issue): remove flag based select when the issue is resolved
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I'm getting the same error even building with --incompatible_enable_cc_toolchain_resolution.
katre
approved these changes
Dec 7, 2020
| "@platforms//os:macos", | ||
| "@platforms//cpu:arm64", | ||
| ], | ||
| values = {"cpu": "darwin_arm64"}, |
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Looks like the dummy cc toolchain isn't being picked up. Would you mind filing this as a separate issue so I can investigate? This PR looks fine to me with the recent change
|
Thanks for the review. I filed it here: #12655. |
comius
approved these changes
Dec 8, 2020
thii
deleted the
use-configuration-flags-for-src-conditions-darwin_arm64
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meteorcloudy
added a commit
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Apr 20, 2021
After this PR, we can use a x86 version of Bazel to build an ARM64 Bazel binary for Apple Silicon by ``` bazel build --cpu=darwin_arm64 //src:bazel ``` The Bazel client, embedded tools and embedded JDK are all native ARM64 binaries. Changes in this PR: 1. Add OpenJDK definitions for ARM64 macOS 2. Manually created the embedded JDK binaries on an Apple Silicon machine and uploaded them to the bazel mirror site. 3. AutoCpuConverter.java: identify the cpu value correctly 4. cc_toolchain_config.bzl: Explicitly specify the target platform also in the x86 cc toolchain, so that we can also do cross-platform compile from ARM64 to x86. With the native arm64 Bazel binary, building Bazel itself takes only half of the time compared with the x86 Bazel binary on an Apple DTK machine: ``` $ bazel build --cpu=darwin_arm64 --disk_cache= --repository_cache= //src:bazel Starting local Bazel server and connecting to it... ... Target //src:bazel up-to-date: bazel-bin/src/bazel INFO: Elapsed time: 1044.462s, Critical Path: 180.08s INFO: 2984 processes: 179 internal, 2092 darwin-sandbox, 1 local, 712 worker. INFO: Build completed successfully, 2984 total actions cp ./bazel-bin/src/bazel ~/bin/bazel-arm64 $ bazel-arm64 clean --expunge $ bazel-arm64 build --disk_cache= --repository_cache= //src:bazel Starting local Bazel server and connecting to it... ... Target //src:bazel up-to-date: bazel-bin/src/bazel INFO: Elapsed time: 464.470s, Critical Path: 114.88s INFO: 2984 processes: 179 internal, 2092 darwin-sandbox, 1 local, 712 worker. INFO: Build completed successfully, 2984 total actions ``` Closes: #11628 Closes #12900. PiperOrigin-RevId: 354058336 Revert default cpu value on x86 macOS to "darwin" Many downstream projects are still depending on the default cpu value on x86 macOS being "darwin" instead of "darwin_x86_64" https://buildkite.com/bazel/bazel-auto-sheriff-face-with-cowboy-hat/builds/412 Related: #11628 Closes #12918. PiperOrigin-RevId: 354279409 Update platform version to 0.0.4 Use configuration flags for //src/conditions:darwin_arm64 Partially reverts 6d637f4, to allow cross-compiling Bazel from darwin_x86_64 to darwin_arm64 with the `--cpu=darwin_arm64` flag. The only source that is different between darwin_x86_64 and darwin_arm64 now is the embedded JDK. Closes #12653. PiperOrigin-RevId: 346298051 Make sure Bazel selects correct remote JDK on Apple Silicon
philwo
pushed a commit
that referenced
this pull request
Apr 20, 2021
After this PR, we can use a x86 version of Bazel to build an ARM64 Bazel binary for Apple Silicon by ``` bazel build --cpu=darwin_arm64 //src:bazel ``` The Bazel client, embedded tools and embedded JDK are all native ARM64 binaries. Changes in this PR: 1. Add OpenJDK definitions for ARM64 macOS 2. Manually created the embedded JDK binaries on an Apple Silicon machine and uploaded them to the bazel mirror site. 3. AutoCpuConverter.java: identify the cpu value correctly 4. cc_toolchain_config.bzl: Explicitly specify the target platform also in the x86 cc toolchain, so that we can also do cross-platform compile from ARM64 to x86. With the native arm64 Bazel binary, building Bazel itself takes only half of the time compared with the x86 Bazel binary on an Apple DTK machine: ``` $ bazel build --cpu=darwin_arm64 --disk_cache= --repository_cache= //src:bazel Starting local Bazel server and connecting to it... ... Target //src:bazel up-to-date: bazel-bin/src/bazel INFO: Elapsed time: 1044.462s, Critical Path: 180.08s INFO: 2984 processes: 179 internal, 2092 darwin-sandbox, 1 local, 712 worker. INFO: Build completed successfully, 2984 total actions cp ./bazel-bin/src/bazel ~/bin/bazel-arm64 $ bazel-arm64 clean --expunge $ bazel-arm64 build --disk_cache= --repository_cache= //src:bazel Starting local Bazel server and connecting to it... ... Target //src:bazel up-to-date: bazel-bin/src/bazel INFO: Elapsed time: 464.470s, Critical Path: 114.88s INFO: 2984 processes: 179 internal, 2092 darwin-sandbox, 1 local, 712 worker. INFO: Build completed successfully, 2984 total actions ``` Closes: #11628 Closes #12900. PiperOrigin-RevId: 354058336 Revert default cpu value on x86 macOS to "darwin" Many downstream projects are still depending on the default cpu value on x86 macOS being "darwin" instead of "darwin_x86_64" https://buildkite.com/bazel/bazel-auto-sheriff-face-with-cowboy-hat/builds/412 Related: #11628 Closes #12918. PiperOrigin-RevId: 354279409 Update platform version to 0.0.4 Use configuration flags for //src/conditions:darwin_arm64 Partially reverts 6d637f4, to allow cross-compiling Bazel from darwin_x86_64 to darwin_arm64 with the `--cpu=darwin_arm64` flag. The only source that is different between darwin_x86_64 and darwin_arm64 now is the embedded JDK. Closes #12653. PiperOrigin-RevId: 346298051 Make sure Bazel selects correct remote JDK on Apple Silicon
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Partially reverts 6d637f4, to allow
cross-compiling Bazel from darwin_x86_64 to darwin_arm64 with
the
--cpu=darwin_arm64flag.The only source that is different between darwin_x86_64 and darwin_arm64
now is the embedded JDK.