Fangrui Song d41ca54775 [ThinLTO] Drop dso_local if a GlobalVariable satisfies isDeclarationForLinker() ... dso_local leads to direct access even if the definition is not within this compilation unit (it is still in the same linkage unit). On ELF, such a relocation (e.g. R_X86_64_PC32) referencing a STB_GLOBAL STV_DEFAULT object can cause a linker error in a -shared link. If the linkage is changed to available_externally, the dso_local flag should be dropped, so that no direct access will be generated. The current behavior is benign, because -fpic does not assume dso_local (clang/lib/CodeGen/CodeGenModule.cpp:shouldAssumeDSOLocal). If we do that for -fno-semantic-interposition (D73865), there will be an R_X86_64_PC32 linker error without this patch. Reviewed By: tejohnson Differential Revision: https://reviews.llvm.org/D74751		2020-04-07 15:46:01 -07:00
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CMakeLists.txt
llvm-link.cpp	[ThinLTO] Drop dso_local if a GlobalVariable satisfies isDeclarationForLinker()	2020-04-07 15:46:01 -07:00
LLVMBuild.txt