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[ClangImporter] -Xclang -fbuiltin-headers-in-system-modules is being passed when it shouldn't #73815

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merged 1 commit into from
May 22, 2024
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[ClangImporter] -Xclang -fbuiltin-headers-in-system-modules is being passed when it shouldn't #73815

merged 1 commit into from
May 22, 2024

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al45tair
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We were accidentally setting requiresBuiltinHeadersInSystemModules because the else here gets executed for things that are not WASI or Musl. Fix by making it conditional.

rdar://128219177

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[ClangImporter] -Xclang -fbuiltin-headers-in-system-modules is bein…
30ecaeb 
…g passed when it shouldn't

We were accidentally setting `requiresBuiltinHeadersInSystemModules` because
the `else` here gets executed for things that are not WASI or Musl.  Fix
by making it conditional.

rdar://128219177
@al45tair al45tair added 🍒 release cherry pick Flag: Release branch cherry picks swift 6.0 labels May 22, 2024
@al45tair al45tair requested a review from a team as a code owner May 22, 2024 08:22
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@swift-ci Please test

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al45tair commented May 22, 2024 •
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Explanation: We had accidentally turned on -fbuiltin-headers-in-system-modules in some cases without meaning to; this was missed both when writing the code and during review because the getLibcFileMapping() function tests the triple and fails if it isn't one that needs a module map overlay, which means that although not obvious, the else branch is executed for things that are not Linux.
Original PR: #73814
Risk: Low.
Reviewed by: @egorzhdan
Resolves: rdar://128219177
Tests: This is exercised by existing tests, though OSS PR and CI testing wouldn't have picked up the problem here at this point.

@al45tair al45tair mentioned this pull request May 22, 2024
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@al45tair al45tair merged commit fe25355 into swiftlang:release/6.0 May 22, 2024
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@nkcsgexi nkcsgexi nkcsgexi approved these changes

@ian-twilightcoder ian-twilightcoder Awaiting requested review from ian-twilightcoder

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