Prevent unnecessary rebuilds when modifying swiftc arguments #8803
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Many arguments for the compiler are marked as `doesNotAffectIncrementalBuild` in `swift-driver`. Use the argument hashing in swift-driver to hash the swift compiler flags and incorporate that in to the build hash signature used to determine if SwiftPM should do a full rebuild. This prevents unnecssary rebuilds when adding or changing arguments like `-Xswiftc -diagnostic-style=llvm`. For a list of arguments that no longer affect rebuilds, search for `doesNotAffectIncrementalBuild` in https://github.com/swiftlang/swift-driver/blob/main/Sources/SwiftOptions/Options.swift. This builds on the work introduced in swiftlang#8717 which avoided unnecessary rebuilds when SwiftPM arguments changed.
plemarquand
requested review from
jakepetroules,
dschaefer2,
shawnhyam,
bripeticca,
owenv,
bkhouri,
cmcgee1024 and
daveyc123
as code owners
|
@plemarquand This is huge in certain situations. Does this also cover env vars, or only command line arguments? |
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@MahdiBM This patch just covers |
owenv
approved these changes
Jun 13, 2025
jakepetroules
approved these changes
Jun 13, 2025
|
@swift-ci please test |
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Great find. Thanks @plemarquand ! |
dschaefer2
approved these changes
Jun 13, 2025
|
@swift-ci test windows |
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@swift-ci test macOS |
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Many arguments for the compiler are marked as
doesNotAffectIncrementalBuildinswift-driver. Use the argument hashing in swift-driver to hash the swift compiler flags and incorporate that in to the build hash signature used to determine if SwiftPM should do a full rebuild.This prevents unnecssary rebuilds when adding or changing arguments like
-Xswiftc -diagnostic-style=llvm. For a list of arguments that no longer affect rebuilds, search fordoesNotAffectIncrementalBuildin https://github.com/swiftlang/swift-driver/blob/main/Sources/SwiftOptions/Options.swift.This builds on the work introduced in #8717 which avoided unnecessary rebuilds when SwiftPM arguments changed.