[clang][Modules] Reporting Errors for Duplicating Link Declarations i… #11265
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…n `modulemap`s (llvm#148959) This PR teaches the modulemap parsing logic to report warnings that default to errors if the parsing logic sees duplicating link declarations in the same module. Specifically, duplicating link declarations means multiple link declarations with the same string-literal in the same module. No errors are reported if a same link declaration exist in a submodule and its enclosing module. The warning can be disabled with `-Wno-module-link-redeclaration`. rdar://155880064 (cherry picked from commit 538e9e8)
AnthonyLatsis
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… in implicit modulemaps swiftlang/llvm-project#11265 broke Windows CI for rebranch because our Windows modulemaps contain implicit submodules with link declarations. This is a temporary workaround to unblock investigation on any downstream issues.
AnthonyLatsis
added a commit
to swiftlang/swift
that referenced
this pull request
Aug 29, 2025
… in implicit modulemaps swiftlang/llvm-project#11265 broke Windows CI for rebranch because our Windows modulemaps contain implicit submodules with link declarations. This is a temporary workaround to unblock investigation on any downstream issues.
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…n
modulemaps (llvm#148959)This PR teaches the modulemap parsing logic to report warnings that default to errors if the parsing logic sees duplicating link declarations in the same module. Specifically, duplicating link declarations means multiple link declarations with the same string-literal in the same module. No errors are reported if a same link declaration exist in a submodule and its enclosing module.
The warning can be disabled with
-Wno-module-link-redeclaration.rdar://155880064
(cherry picked from commit 538e9e8)