Merge pull request #23 from rust-lang/fix-llvm-enzyme-linkage4

Fix llvm enzyme linkage4

Author: ZuseZ4

enzyme/Enzyme/CMakeLists.txt

@@ -152,16 +152,28 @@ if (${ENZYME_EXTERNAL_SHARED_LIB})
         # This would be the desired way to link against LLVM components,
         # however this function is bugged and does not work with `all`, see:
         # https://github.com/llvm/llvm-project/issues/46347
-        #llvm_map_components_to_libnames(llvm_libs all)
+        #llvm_map_components_to_libnames(llvm_libraries Passes)
         # Therefore, manually invoke llvm-config
+        if (EXISTS "${LLVM_TOOLS_BINARY_DIR}/llvm-config")
+            message(STATUS "Using llvm-config from ${LLVM_TOOLS_BINARY_DIR}")
+        else()
+            message(SEND_ERROR "llvm-config not found in ${LLVM_TOOLS_BINARY_DIR}")
+        endif()
         execute_process(COMMAND ${LLVM_TOOLS_BINARY_DIR}/llvm-config --libs all
                     OUTPUT_VARIABLE llvm_libraries)
         string(STRIP "${llvm_libraries}" llvm_libraries)
+        message(STATUS "Linking against LLVM libraries: ${llvm_libraries}")
         # In theory, adding --libs should also add all the -l flags,
         # but it isn't picked up correctly by clang, so we call target_link_libraries
-        set_target_properties(Enzyme-${LLVM_VERSION_MAJOR} PROPERTIES
-            LINK_FLAGS "`${LLVM_TOOLS_BINARY_DIR}/llvm-config --ldflags`")
-        target_link_libraries(Enzyme-${LLVM_VERSION_MAJOR} ${llvm_libraries})
+        execute_process(COMMAND ${LLVM_TOOLS_BINARY_DIR}/llvm-config --ldflags
+                    OUTPUT_VARIABLE llvm_ldflags)
+        string(STRIP "${llvm_ldflags}" llvm_ldflags)
+        message(STATUS "Linking against LLVM ldflags: ${llvm_ldflags}")
+        set_target_properties(Enzyme-${LLVM_VERSION_MAJOR} PROPERTIES LINK_FLAGS ${llvm_ldflags})
+        target_link_libraries(Enzyme-${LLVM_VERSION_MAJOR} PRIVATE ${llvm_libraries})
+        
+        llvm_map_components_to_libnames(llvm_librariess Passes Support)
+        target_link_libraries(Enzyme-${LLVM_VERSION_MAJOR} PRIVATE ${llvm_librariess})
     endif()
     install(TARGETS Enzyme-${LLVM_VERSION_MAJOR}
         EXPORT EnzymeTargets