[Index] Don't generate a unit file when building implicit modules #10877
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When compiling a file that requires a module to be compiled, we cloned the compiler instance for the module compile. If that compiler instance had an index unit output path set, we would use that name for the unit file of the pcm, which would get overwritten as soon as the unit for that source file is written at the end of that compilation process. Fix this issue by clearning the index unit output path for the PCM compilation process. Also respect `IndexIgnorePcms` and don’t generate an index for the PCMs by clearning the `IndexStorePath` to disable indexing of the PCMs
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@swift-ci Please test llvm |
After this change does it still generate a unit file for the PCM but with a proper path? |
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Yes, the issue was that when implicitly building modules, we would clone the compiler instance, which would also retain the original invocation’s |
akyrtzi
approved these changes
Jun 23, 2025
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@swift-ci Please test |
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Cherry-pick of #10848 to
stable/20240723When compiling a file that requires a module to be compiled, we cloned the compiler instance for the module compile. If that compiler instance had an index unit output path set, we would use that name for the unit file of the pcm, which would get overwritten as soon as the unit for that source file is written at the end of that compilation process. Fix this issue by clearning the index unit output path for the PCM compilation process.
Also respect
IndexIgnorePcmsand don’t generate an index for the PCMs by clearning theIndexStorePathto disable indexing of the PCMs