Use newer split module flag with Swift 5.4 #699
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Uses the newer `-experimental-skip-non-inlinable-function-bodies-without-types` which was introduced here: swiftlang/swift#34612. This should improve LLDB usage in some cases. When using WMO, it has two downsides in Swift 5.5, both introduced by swiftlang/swift#38939: - The swiftmodules will have swiftdeps info embedded in them, which is only needed for incremental compilation - Interface hashing is enabled, which again is only needed for incremental compilation This is because the swift compiler only expects `-experimental-skip-non-inlinable-function-bodies-without-types` to be used with the new `emit-module-separately` incremental build.
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Lyft integration job started: https://buildkite.com/lyft/rules-swift/builds/71 (must be Lyft employee to view) |
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I'm not sure how to make the test differ based on Xcode version used. |
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do the embedded swiftdeps include all the normal things like timestamps? |
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🙏🏻 |
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Uses the newer
-experimental-skip-non-inlinable-function-bodies-without-typeswhich was introduced here: swiftlang/swift#34612. This should improve LLDB usage in some cases.When using WMO, it has two downsides in Swift 5.5, both introduced by swiftlang/swift#38939:
This is because the swift compiler only expects
-experimental-skip-non-inlinable-function-bodies-without-typesto be used with the new-emit-module-separatelyincremental build. In the same vein, in order to support split modules with incremental builds, we need to use this flag (though we could choose to use this version only with incremental + split modules, if we decide it's not worth the above regressions).