-I to modules build folder allows unexpected import Module to work

[rauhul]

Is it reproducible with SwiftPM command-line tools: swift build, swift test, swift package etc?

• Confirmed reproduction steps with SwiftPM CLI. The description text must include reproduction steps with either of command-line SwiftPM commands, swift build, swift test, swift package etc.

Description

Because swift build drops all modules into the same folder and passes that folder via a -I swiftc is able to see module that weren't explicitly depended upon in the Package.swift. Instead we can use -explicit-swift-module-map-file and tell the name and path to each module it should have visibility of.

Expected behavior

No response

Actual behavior

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Steps to reproduce

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Swift Package Manager version/commit hash

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Swift & OS version (output of swift --version ; uname -a)

No response