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Currently, when a swiftinterface file fails to load, we emit the specific diagnostics for the failures, followed by a generic “failed to load module ‘Foo’” message. This PR improves that final diagnostic, particularly when the cause may be that the interface was emitted by a newer compiler using backwards-incompatible syntax.
28 lines
1.7 KiB
Swift
28 lines
1.7 KiB
Swift
// Tests the diagnostics emitted when we can't build a module interface, and
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// particularly whether or not they call out compiler version mismatches.
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//
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// First, emit an empty module interface from the current compiler, then add
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// some invalid syntax to it:
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//
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// RUN: %empty-directory(%t)
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// RUN: echo "" | %target-swift-frontend -typecheck -emit-module-interface-path %t/UnbuildableCurrent.swiftinterface -enable-library-evolution -swift-version 5 -module-name UnbuildableCurrent -
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// RUN: echo "public func fn(_: String = #somethingYouveNeverHeardOf)" >> %t/UnbuildableCurrent.swiftinterface
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//
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// Next, modify a version of it so it looks like it was built with a different Swift compiler:
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//
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// RUN: sed -E -e 's|swift-compiler-version: (.*)|swift-compiler-version: NeoTokyoSwift 2000.42|' -e 's|UnbuildableCurrent|UnbuildableFuture|g' %t/UnbuildableCurrent.swiftinterface > %t/UnbuildableFuture.swiftinterface
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//
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// And finally, test:
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//
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// RUN: not %target-swift-frontend -typecheck %s -I %t -DCURRENT 2>&1 | %FileCheck -check-prefix=CURRENT %s
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// RUN: not %target-swift-frontend -typecheck %s -I %t -DFUTURE 2>&1 | %FileCheck -check-prefix=FUTURE %s
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#if CURRENT
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import UnbuildableCurrent
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// CURRENT: unbuildable.swift:[[@LINE-1]]:8: error: failed to build module 'UnbuildableCurrent' from its module interface; it may have been damaged or it may have triggered a bug in the Swift compiler when it was produced
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#else
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import UnbuildableFuture
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// FUTURE: unbuildable.swift:[[@LINE-1]]:8: error: failed to build module 'UnbuildableFuture' from its module interface; the compiler that produced it, 'NeoTokyoSwift 2000.42', may have used features that aren't supported by this compiler, '{{.*Swift version.*}}'
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#endif
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