Fangrui Song 252a1eecc0 [ThinLTO] Respect ClearDSOLocalOnDeclarations for unimported functions ... D74751 added `ClearDSOLocalOnDeclarations` and dropped dso_local for isDeclarationForLinker `GlobalValue`s. It missed a case for imported declarations (`doImportAsDefinition` is false while `isPerformingImport` is true). This can lead to a linker error for a default visibility symbol in `ld.lld -shared`. When `ClearDSOLocalOnDeclarations` is true, we check `isPerformingImport() && !doImportAsDefinition(&GV)` along with `GV.isDeclarationForLinker()`. The new condition checks an imported declaration. This patch fixes a `LLVMPolly.so` link error using a trunk clang -DLLVM_ENABLE_LTO=Thin. Reviewed By: tejohnson Differential Revision: https://reviews.llvm.org/D104986		2021-07-02 17:08:25 -07:00
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X86	[ThinLTO] Respect ClearDSOLocalOnDeclarations for unimported functions	2021-07-02 17:08:25 -07:00