buildifier and docs

Signed-off-by: Aaron Sky <aaronsky@skyaaron.com>

Author: aaronsky

docs/usage.md

@@ -187,6 +187,15 @@ a project `xcodeproj_extra_flags.bazelrc` file, which is loaded after the
 workspace `.bazelrc` file. This ensures that they override any flags set
 earlier, mimicking the behavior of command-line set flags taking precedence.
 
+## Separate the index build output base
+
+By default, rules_xcodeproj configures Xcode to use a combined output base For
+both normal builds and index builds. This is done to save disk space and improve
+cache hit rates, since both types of builds can share outputs. However, if you
+find that index builds are interfering with normal builds, you can disable
+this behavior during project generation by setting
+`--@rules_xcodeproj//xcodeproj:separate_index_build_output_base` in your bazelrc.
+
 # Command-line API
 
 rules_xcodeproj builds targets in its own

xcodeproj/internal/xcodeproj_rule.bzl

@@ -819,9 +819,9 @@ def _xcodeproj_attrs(
         "project_options": attr.string_dict(mandatory = True),
         "runner_build_file": attr.string(mandatory = True),
         "runner_label": attr.string(mandatory = True),
-        "separate_index_build_output_base": attr.bool(mandatory = True),
         "scheme_autogeneration_config": attr.string_list_dict(mandatory = True),
         "scheme_autogeneration_mode": attr.string(mandatory = True),
+        "separate_index_build_output_base": attr.bool(mandatory = True),
         "target_name_mode": attr.string(mandatory = True),
         "top_level_device_targets": attr.label_list(
             cfg = target_transitions.device,