[CMake] Support symlinks with the same name as the binary

This supports creating symlinks to tools in different directories than
the tool is built to. This is useful for the LLDB framework build which
I’m sending patches for shortly.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@281788 91177308-0d34-0410-b5e6-96231b3b80d8

cmake/modules/AddLLVM.cmake

@@ -1246,6 +1246,12 @@ function(add_llvm_tool_symlink name dest)
 
   set(output_path "${LLVM_RUNTIME_OUTPUT_INTDIR}/${name}${CMAKE_EXECUTABLE_SUFFIX}")
 
+  set(target_name ${name})
+  if(TARGET ${name})
+    set(target_name ${name}-link)
+  endif()
+
+
   if(ARG_ALWAYS_GENERATE)
     set_property(DIRECTORY APPEND PROPERTY
       ADDITIONAL_MAKE_CLEAN_FILES ${dest_binary})
@@ -1255,8 +1261,8 @@ function(add_llvm_tool_symlink name dest)
     add_custom_command(OUTPUT ${output_path}
                      COMMAND ${CMAKE_COMMAND} -E ${LLVM_LINK_OR_COPY} "${dest_binary}" "${output_path}"
                      DEPENDS ${dest})
-    add_custom_target(${name} ALL DEPENDS ${output_path})
-    set_target_properties(${name} PROPERTIES FOLDER Tools)
+    add_custom_target(${target_name} ALL DEPENDS ${output_path})
+    set_target_properties(${target_name} PROPERTIES FOLDER Tools)
 
     # Make sure the parent tool is a toolchain tool, otherwise exclude this tool
     list(FIND LLVM_TOOLCHAIN_TOOLS ${dest} LLVM_IS_${dest}_TOOLCHAIN_TOOL)