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Merged
merged 3 commits into from
Feb 12, 2025
Merged

Enable Library Evolution in package builds for public library targets #951

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7b3d669
Enable Library Evolution in package builds for public library targets
stmontgomery Feb 12, 2025
e2f3fe4
Limit library evolution to only Apple platforms for the Foundation cr…
stmontgomery Feb 12, 2025
e8fd2e9
Add explanatory comment
stmontgomery Feb 12, 2025
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16 changes: 13 additions & 3 deletions Package.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -55,7 +55,7 @@ let package = Package(
],
exclude: ["CMakeLists.txt", "Testing.swiftcrossimport"],
cxxSettings: .packageSettings,
swiftSettings: .packageSettings,
swiftSettings: .publicLibraryTargetSettings,
linkerSettings: [
.linkedLibrary("execinfo", .when(platforms: [.custom("freebsd"), .openbsd]))
]
Expand Down Expand Up @@ -114,7 +114,7 @@ let package = Package(
"Testing",
],
path: "Sources/Overlays/_Testing_CoreGraphics",
swiftSettings: .packageSettings
swiftSettings: .publicLibraryTargetSettings
),
.target(
name: "_Testing_Foundation",
Expand All @@ -123,7 +123,7 @@ let package = Package(
],
path: "Sources/Overlays/_Testing_Foundation",
exclude: ["CMakeLists.txt"],
swiftSettings: .packageSettings
swiftSettings: .publicLibraryTargetSettings
),
],

Expand Down Expand Up @@ -166,6 +166,16 @@ extension Array where Element == PackageDescription.SwiftSetting {
]
}

/// Settings intended to be applied to every public Swift library target in
/// this package.
static var publicLibraryTargetSettings: Self {
packageSettings + [
// Enable Library Evolution to match the way this library is built for
// distribution.
.unsafeFlags(["-enable-library-evolution"]),
]
}

/// Settings which define commonly-used OS availability macros.
///
/// These leverage a pseudo-experimental feature in the Swift compiler for
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2 changes: 1 addition & 1 deletion Sources/Testing/Running/Configuration.swift
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Expand Up @@ -199,7 +199,7 @@ public struct Configuration: Sendable {
/// property is pre-configured. Otherwise, the default value of this property
/// records an issue indicating that it has not been configured.
@_spi(Experimental)
public var exitTestHandler: ExitTest.Handler = { _ in
public var exitTestHandler: ExitTest.Handler = { exitTest in
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After I enabled Library Evolution, I got a compiler crash when building with a main snapshot toolchain which has asserts enabled:

Begin Error in Function: '$s7Testing13ConfigurationV15exitTestHandleryAA04ExitD9ArtifactsVAA02__fD0VYaYbKcvpfiAfHYaYbKcfU_'
Found outside of lifetime use?!
Value:   %2 = load_borrow %1 : $*__ExitTest              // users: %8, %4, %3
Consuming User:   end_borrow %2 : $__ExitTest                     // id: %4
Non Consuming User:   debug_value %2 : $__ExitTest, let, name "_0", argno 1 // id: %8
Block: bb0

End Error in Function: '$s7Testing13ConfigurationV15exitTestHandleryAA04ExitD9ArtifactsVAA02__fD0VYaYbKcvpfiAfHYaYbKcfU_'
Found ownership error?!

1.  Apple Swift version 6.2-dev (LLVM 5805166b4c9eb06, Swift 57234f8034befac)
2.  Compiling with the current language version
3.  While evaluating request ExecuteSILPipelineRequest(Run pipelines { Non-Diagnostic Mandatory Optimizations, Serialization, Rest of Onone } on SIL for Testing)
4.  While running pass #679 SILFunctionTransform "OwnershipModelEliminator" on SILFunction "@$s7Testing13ConfigurationV15exitTestHandleryAA04ExitD9ArtifactsVAA02__fD0VYaYbKcvpfiAfHYaYbKcfU_".
 for expression at [/Users/stuart/Work/swift-testing/Sources/Testing/Running/Configuration.swift:221:50 - line:223:3] RangeText="{ (_: borrowing ExitTest) throws -> ExitTestArtifacts in
    throw SystemError(description: "Exit test support has not been implemented by the current testing infrastructure.")
  "
5.  Found verification error when verifying before lowering ownership. Please re-run with -sil-verify-all to identify the actual pass that introduced the verification error.
6.  While verifying SIL function "@$s7Testing13ConfigurationV15exitTestHandleryAA04ExitD9ArtifactsVAA02__fD0VYaYbKcvpfiAfHYaYbKcfU_".
 for expression at [/Users/stuart/Work/swift-testing/Sources/Testing/Running/Configuration.swift:221:50 - line:223:3] RangeText="{ (_: borrowing ExitTest) throws -> ExitTestArtifacts in
    throw SystemError(description: "Exit test support has not been implemented by the current testing infrastructure.")
  "

The closure parameter is of type borrowing ExitTest, and as a workaround I found simply giving it a name instead of the wildcard _ resolves the crash. I can file an issue to track that separately tomorrow.

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That's bizarre. Okay.

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Actually I think this might be the same issue as the one you just had to work around? @jckarter?

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This is a different issue than swiftlang/swift#79304

throw SystemError(description: "Exit test support has not been implemented by the current testing infrastructure.")
}
#endif
Expand Down