diff --git a/compiler-rt/cmake/Modules/AddCompilerRT.cmake b/compiler-rt/cmake/Modules/AddCompilerRT.cmake
--- a/compiler-rt/cmake/Modules/AddCompilerRT.cmake
+++ b/compiler-rt/cmake/Modules/AddCompilerRT.cmake
@@ -598,6 +598,7 @@
     CMAKE_OBJCOPY
     CMAKE_OBJDUMP
     CMAKE_STRIP
+    CMAKE_READELF
     CMAKE_SYSROOT
     LIBCXX_HAS_MUSL_LIBC
     PYTHON_EXECUTABLE
diff --git a/compiler-rt/test/CMakeLists.txt b/compiler-rt/test/CMakeLists.txt
--- a/compiler-rt/test/CMakeLists.txt
+++ b/compiler-rt/test/CMakeLists.txt
@@ -1,5 +1,6 @@
 # Needed for lit support in standalone builds.
 include(AddLLVM)
+include(LLVMExternalProjectUtils)
 
 option(COMPILER_RT_TEST_STANDALONE_BUILD_LIBS
   "When set to ON and testing in a standalone build, test the runtime \
@@ -36,6 +37,21 @@
     if (WIN32)
       list(APPEND SANITIZER_COMMON_LIT_TEST_DEPS KillTheDoctor)
     endif()
+  elseif(COMPILER_RT_STANDALONE_BUILD)
+    # These are tools needed for testing in a standalone/runtimes build, but we
+    # don't have a corresponding CMAKE_* flag for. These will need to be rebuilt.
+    set(LIT_ONLY_TOOLS FileCheck count not clang-resource-headers)
+    foreach(dep ${LIT_ONLY_TOOLS})
+      if (NOT TARGET ${dep})
+        llvm_ExternalProject_BuildCmd(build_${dep} ${dep} ${BINARY_DIR})
+        add_custom_target(${dep}
+          COMMAND ${build_${dep}}
+          WORKING_DIRECTORY ${BINARY_DIR}
+          VERBATIM USES_TERMINAL)
+      endif()
+    endforeach()
+
+    list(APPEND SANITIZER_COMMON_LIT_TEST_DEPS ${LIT_ONLY_TOOLS})
   endif()
   # Tests use C++ standard library headers.
   if (TARGET cxx-headers OR HAVE_LIBCXX)