[6.2 🍒][clang] Allow parameterized 'isWeakImport' based on an enclosing platform version #10568
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…form version Similarly to 'CheckAvailability' and 'getAvailability', set 'Decl::isWeakImported' to allow querying using an external target platform version. In #7916 we have added support for configuring 'clang::CodeGenerator' with a differently-versioned target info, and this change adopts the code generator's target info in order to also determine weakly-imported linkage on declarations during code-gen. Before this change, they were relying on the 'ASTContext' to specify the target info, which may differ from code-gen's.
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Cherry-pick of #10555
Similarly to 'CheckAvailability' and 'getAvailability', set 'Decl::isWeakImported' to allow querying using an external target platform version.
In #7916 we have added support for configuring 'clang::CodeGenerator' with a differently-versioned target info, and this change adopts the code generator's target info in order to also determine weakly-imported linkage on declarations during code-gen. Before this change, they were relying on the 'ASTContext' to specify the target info, which may differ from code-gen's.