Bug: index builds invalidate regular builds

[mjburghard]

Description

rules_xcodeproj's index build invalidate some actions/output of regular builds, causing recompiles during consecutive builds without any local changes or invalidations of unrelated parts of the build graph.

Reproduction steps

Reproduction steps for iOSApp in rules_xcodeproj/examples/integration:

1. Generate a project (bazelisk run //:xcodeproj-incremental-bazel-sim_arm64)
2. Build iOSApp on the command line using the bazel invocation Xcode would produce
3. Run same invocation again
4. Run index build invocation from Xcode on the command line for @//Lib/dist/dynamic:iOS
5. Run build invocation for iOS App again.
   Important: Keep Xcode closed while performing the steps above.

Bazel invocation for steps two, three and five:

bazel \
--host_jvm_args=-Xdock:name=/Applications/Xcode.app/Contents/Developer \
--noworkspace_rc \
--bazelrc=<path_to>/rules_xcodeproj/examples/integration/Integration.xcodeproj/rules_xcodeproj/bazel/xcodeproj.bazelrc \
--bazelrc=.bazelrc \
--output_base <path_to>/rules_xcodeproj/examples/integration/bazel-output-base/rules_xcodeproj.noindex/build_output_base build \
--xcode_version=16A242d \
--repo_env=DEVELOPER_DIR=/Applications/Xcode.app/Contents/Developer \
--repo_env=USE_CLANG_CL=16A242d --repo_env=XCODE_VERSION=16A242d \
--bes_upload_mode=NOWAIT_FOR_UPLOAD_COMPLETE \
'--remote_download_regex=.*\.indexstore/.*|.*\.(a|cfg|c|C|cc|cl|cpp|cu|cxx|c++|def|h|H|hh|hpp|hxx|h++|hmap|ilc|inc|inl|ipp|tcc|tlh|tli|tpp|m|modulemap|mm|pch|swift|swiftdoc|swiftmodule|swiftsourceinfo|yaml)$' \
--nokeep_going \
--config=_rules_xcodeproj_integration_build \
--color=yes \
'--output_groups=index_import,target_ids_list,bc @@//iOSApp/Source:iOSApp ios_sim_arm64-dbg-ios-sim_arm64-min15.0-applebin_ios-ST-076e152330dd,bp @@//iOSApp/Source:iOSApp ios_sim_arm64-dbg-ios-sim_arm64-min15.0-applebin_ios-ST-076e152330dd,bi @@//iOSApp/Source:iOSApp ios_sim_arm64-dbg-ios-sim_arm64-min15.0-applebin_ios-ST-076e152330dd' @@rules_xcodeproj++internal+rules_xcodeproj_generated//generator/xcodeproj-incremental-bazel-sim_arm64:xcodeproj-incremental-bazel-sim_arm64 \
--build_metadata=PATTERN=@@//iOSApp/Source:iOSApp

Bazel invocation for step four:

bazel \
    --host_jvm_args=-Xdock:name=/Applications/Xcode.app/Contents/Developer \
    --noworkspace_rc \
    --bazelrc=<path_to>/rules_xcodeproj/examples/integration/Integration.xcodeproj/rules_xcodeproj/bazel/xcodeproj.bazelrc \
    --bazelrc=.bazelrc \
    --output_base <path_to>/rules_xcodeproj/examples/integration/bazel-output-base/rules_xcodeproj.noindex/build_output_base \
    --preemptible \
    build \
    --xcode_version=16A242d \
    --repo_env=DEVELOPER_DIR=/Applications/Xcode.app/Contents/Developer \
    --repo_env=USE_CLANG_CL=16A242d \
    --repo_env=XCODE_VERSION=16A242d \
    --bes_upload_mode=NOWAIT_FOR_UPLOAD_COMPLETE \
    '--remote_download_regex=.*\.indexstore/.*|.*|.*\.(cfg|c|C|cc|cl|cpp|cu|cxx|c++|def|h|H|hh|hpp|hxx|h++|hmap|ilc|inc|inl|ipp|tcc|tlh|tli|tpp|m|modulemap|mm|pch|swift|swiftdoc|swiftmodule|swiftsourceinfo|yaml)$' \
    --config=rules_xcodeproj_integration_indexbuild \
    --color=yes \
    '--output_groups=bc @@//Lib/dist/dynamic:iOS ios_sim_arm64-dbg-ios-sim_arm64-min15.0-applebin_ios-ST-076e152330dd,bp @@//Lib/dist/dynamic:iOS ios_sim_arm64-dbg-ios-sim_arm64-min15.0-applebin_ios-ST-076e152330dd,index_import,bi @@//Lib/dist/dynamic:iOS ios_sim_arm64-dbg-ios-sim_arm64-min15.0-applebin_ios-ST-076e152330dd' @@rules_xcodeproj++internal+rules_xcodeproj_generated//generator/xcodeproj-incremental-bazel-sim_arm64:xcodeproj-incremental-bazel-sim_arm64

Expected behavior

Index build actions can run in the background without causing recompiles for the next regular build.

rules_xcodeproj version

41929ac

Xcode version

16.0

Bazel version

8.1.1, 7.5.0

rules_apple version

3.16.1

rules_swift version

2.8.0

Additional information

No response