Refactor protobuf flag abstraction layer to custom flag targets#28787
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Instead of having rules depend on both native and Starlark versions of flags and reconciling them inside the rule implementation, this change moves the resolution logic into custom flag targets (`compat_bool_flag` and `compat_string_list_flag`) defined in `third_party/protobuf/bazel/private/compat_flag.bzl`. Key details: - `compat_bool_flag`: Instantiates a `string_flag` with a "default" sentinel value to detect explicit Starlark flag settings vs. fallback to native `config_setting` matches or default values, providing a boolean `BuildSettingInfo`. - `compat_string_list_flag`: Defines a string-list build setting that reconciles explicit Starlark build settings with `ctx.fragments.proto` and default values. - Updates rule implementations under `third_party/protobuf/bazel/private/` to consume custom flag targets directly. - Replaces `native_bool_flag.bzl` with `compat_flag.bzl`. PiperOrigin-RevId: 952990495
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Refactor protobuf flag abstraction layer to custom flag targets
Instead of having rules depend on both native and Starlark versions of flags and reconciling them inside the rule implementation, this change moves the resolution logic into custom flag targets (
compat_bool_flagandcompat_string_list_flag) defined inthird_party/protobuf/bazel/private/compat_flag.bzl.Key details:
compat_bool_flag: Instantiates astring_flagwith a "default" sentinel value to detect explicit Starlark flag settings vs. fallback to nativeconfig_settingmatches or default values, providing a booleanBuildSettingInfo.compat_string_list_flag: Defines a string-list build setting that reconciles explicit Starlark build settings withctx.fragments.protoand default values.third_party/protobuf/bazel/private/to consume custom flag targets directly.native_bool_flag.bzlwithcompat_flag.bzl.