[CMake] Add install targets for utilities to LLVM exports if LLVM_INSTALL_UTILS=ON

[sgraenitz]

Summary

D56606 was only appending target names to the LLVM_EXPORTS/LLVM_EXPORTS_BUILDTREE_ONLY properties. Targets showed up correctly in the build-tree LLVMExports.cmake, but they were missing in the installed one (as we found in https://bugs.llvm.org/show_bug.cgi?id=40443), because install did not register them explicitly.

[smeenai]

LGTM

llvm/trunk/cmake/modules/AddLLVM.cmake

 # for development, but that are not intended to be installed by default.
 macro(add_llvm_utility name)
   if ( NOT LLVM_BUILD_UTILS )
     set(EXCLUDE_FROM_ALL ON)
   endif()
 
   add_llvm_executable(${name} DISABLE_LLVM_LINK_LLVM_DYLIB ${ARGN})
   set_target_properties(${name} PROPERTIES FOLDER "Utils")
-  if( LLVM_INSTALL_UTILS AND LLVM_BUILD_UTILS )
-    install (TARGETS ${name}
+  if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+    if (LLVM_INSTALL_UTILS AND LLVM_BUILD_UTILS)
+      if (${name} IN_LIST LLVM_DISTRIBUTION_COMPONENTS OR
+          NOT LLVM_DISTRIBUTION_COMPONENTS)
+        set(export_to_llvmexports EXPORT LLVMExports)
+        set_property(GLOBAL PROPERTY LLVM_HAS_EXPORTS True)
+      endif()
+
+      install(TARGETS ${name}
+              ${export_to_llvmexports}
               RUNTIME DESTINATION ${LLVM_UTILS_INSTALL_DIR}
               COMPONENT ${name})
+
       if (NOT LLVM_ENABLE_IDE)
         add_llvm_install_targets(install-${name}
                                  DEPENDS ${name}
                                  COMPONENT ${name})
       endif()
       set_property(GLOBAL APPEND PROPERTY LLVM_EXPORTS ${name})
-  elseif( LLVM_BUILD_UTILS )
+    elseif(LLVM_BUILD_UTILS)
       set_property(GLOBAL APPEND PROPERTY LLVM_EXPORTS_BUILDTREE_ONLY ${name})
     endif()
+  endif()
 endmacro(add_llvm_utility name)
 
 macro(add_llvm_fuzzer name)
   cmake_parse_arguments(ARG "" "DUMMY_MAIN" "" ${ARGN})
   if( LLVM_LIB_FUZZING_ENGINE )
     set(LLVM_OPTIONAL_SOURCES ${ARG_DUMMY_MAIN})
     add_llvm_executable(${name} ${ARG_UNPARSED_ARGUMENTS})
     target_link_libraries(${name} PRIVATE ${LLVM_LIB_FUZZING_ENGINE})