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Taken from the Gentoo patch:
https://gitweb.gentoo.org/repo/gentoo.git/tree/sys-devel/llvm-roc/files/llvm-roc-5.0.0-linkdl.patch

LLVMOffloadArch should link libdl to fix undefined symbol 'dlsym' when linking

--- a/llvm/lib/OffloadArch/offload-arch/CMakeLists.txt
+++ b/llvm/lib/OffloadArch/offload-arch/CMakeLists.txt
@@ -3,6 +3,7 @@ add_llvm_tool(offload-arch
   ${CMAKE_CURRENT_SOURCE_DIR}/offload-arch.cpp
   DEPENDS generated-table LLVMOffloadArch
 )
+target_link_libraries(LLVMOffloadArch PRIVATE ${CMAKE_DL_LIBS})
 target_link_libraries(offload-arch PRIVATE LLVMOffloadArch)
 
 if(CMAKE_HOST_UNIX)