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We've recently added the -experimental-hermetic-seal-at-link compiler flag, which turns on aggressive dead-stripping optimizations and assumes that library code can be optimized against client code because all users of the library code/types are present at link/LTO time. This means that any module that's built with -experimental-hermetic-seal-at-link requires all clients of this module to also use -experimental-hermetic-seal-at-link. This PR enforces that by storing a bit in the serialized module, and checking the bit when importing modules.
16 lines
681 B
Swift
16 lines
681 B
Swift
// RUN: %empty-directory(%t)
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// RUN: %target-swift-frontend %s -D MOD1 -experimental-hermetic-seal-at-link -emit-module -o %t/Mod1.swiftmodule
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// RUN: not %target-swift-frontend %s -D MOD2 -emit-module -o %t/Mod2.swiftmodule -I %t 2>&1 | %FileCheck %s
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// RUN: %target-swift-frontend %s -D MOD2 -experimental-hermetic-seal-at-link -emit-module -o %t/Mod2.swiftmodule -I %t
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// CHECK: {{.*}} error: module 'Mod1' was built with -experimental-hermetic-seal-at-link, but current compilation does not have -experimental-hermetic-seal-at-link
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#if MOD1
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public func foo() {}
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#endif
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#if MOD2
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import Mod1
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public func bar() {}
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#endif
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