diff --git a/clang-tools-extra/CMakeLists.txt b/clang-tools-extra/CMakeLists.txt
--- a/clang-tools-extra/CMakeLists.txt
+++ b/clang-tools-extra/CMakeLists.txt
@@ -4,6 +4,15 @@
 option(CLANG_TIDY_ENABLE_STATIC_ANALYZER
   "Include static analyzer checks in clang-tidy" ON)
 
+if(CLANG_INCLUDE_TESTS)
+  umbrella_lit_testsuite_begin(check-clang-tools)
+
+  option(CLANG_TOOLS_TEST_USE_VG "Run Clang tools' tests under Valgrind" OFF)
+  if(CLANG_TOOLS_TEST_USE_VG)
+    set_property(GLOBAL APPEND PROPERTY LLVM_CLANG_TOOLS_LIT_EXTRA_ARGS "--vg")
+  endif()
+endif()
+
 add_subdirectory(clang-apply-replacements)
 add_subdirectory(clang-reorder-fields)
 add_subdirectory(modularize)
@@ -19,12 +28,6 @@
 add_subdirectory(pseudo)
 add_subdirectory(tool-template)
 
-# Add the common testsuite after all the tools.
-if(CLANG_INCLUDE_TESTS)
-add_subdirectory(test)
-add_subdirectory(unittests)
-endif()
-
 option(CLANG_TOOLS_EXTRA_INCLUDE_DOCS "Generate build targets for the Clang Extra Tools docs."
   ${LLVM_INCLUDE_DOCS})
 if( CLANG_TOOLS_EXTRA_INCLUDE_DOCS )
@@ -37,3 +40,10 @@
 if (CLANG_ENABLE_CLANGD)
   add_subdirectory(clangd)
 endif()
+
+# Add the common testsuite after all the tools.
+if(CLANG_INCLUDE_TESTS)
+  add_subdirectory(test)
+  add_subdirectory(unittests)
+  umbrella_lit_testsuite_end(check-clang-tools)
+endif()
diff --git a/clang-tools-extra/test/CMakeLists.txt b/clang-tools-extra/test/CMakeLists.txt
--- a/clang-tools-extra/test/CMakeLists.txt
+++ b/clang-tools-extra/test/CMakeLists.txt
@@ -27,11 +27,6 @@
   ${CMAKE_CURRENT_SOURCE_DIR}/Unit/lit.cfg.py
   )
 
-option(CLANG_TOOLS_TEST_USE_VG "Run Clang tools' tests under Valgrind" OFF)
-if(CLANG_TOOLS_TEST_USE_VG)
-  set(CLANG_TOOLS_TEST_EXTRA_ARGS ${CLANG_TEST_EXTRA_ARGS} "--vg")
-endif()
-
 set(CLANG_TOOLS_TEST_DEPS
   # For the clang-apply-replacements test that uses clang-rename.
   clang-rename
@@ -101,14 +96,6 @@
   endif()
 endif()
 
-add_lit_testsuite(check-clang-tools "Running the Clang extra tools' regression tests"
-  ${CMAKE_CURRENT_BINARY_DIR}
-  DEPENDS ${CLANG_TOOLS_TEST_DEPS}
-  ARGS ${CLANG_TOOLS_TEST_EXTRA_ARGS}
-  )
-
-set_target_properties(check-clang-tools PROPERTIES FOLDER "Clang extra tools' tests")
-
 add_lit_testsuites(CLANG-EXTRA ${CMAKE_CURRENT_SOURCE_DIR}
   DEPENDS ${CLANG_TOOLS_TEST_DEPS}
   )
diff --git a/clang/CMakeLists.txt b/clang/CMakeLists.txt
--- a/clang/CMakeLists.txt
+++ b/clang/CMakeLists.txt
@@ -191,7 +191,9 @@
     else()
       set(LLVM_INCLUDE_TESTS OFF)
     endif()
-  endif()
+
+    umbrella_lit_testsuite_begin(check-all)
+  endif() # LLVM_INCLUDE_TESTS
 
   set(BACKEND_PACKAGE_STRING "LLVM ${LLVM_PACKAGE_VERSION}")
 else()
@@ -585,21 +587,7 @@
   add_subdirectory(bindings/python/tests)
 
   if(CLANG_BUILT_STANDALONE)
-    # Add a global check rule now that all subdirectories have been traversed
-    # and we know the total set of lit testsuites.
-    get_property(LLVM_LIT_TESTSUITES GLOBAL PROPERTY LLVM_LIT_TESTSUITES)
-    get_property(LLVM_LIT_PARAMS GLOBAL PROPERTY LLVM_LIT_PARAMS)
-    get_property(LLVM_LIT_DEPENDS GLOBAL PROPERTY LLVM_LIT_DEPENDS)
-    get_property(LLVM_LIT_EXTRA_ARGS GLOBAL PROPERTY LLVM_LIT_EXTRA_ARGS)
-    get_property(LLVM_ADDITIONAL_TEST_TARGETS
-                 GLOBAL PROPERTY LLVM_ADDITIONAL_TEST_TARGETS)
-    add_lit_target(check-all
-      "Running all regression tests"
-      ${LLVM_LIT_TESTSUITES}
-      PARAMS ${LLVM_LIT_PARAMS}
-      DEPENDS ${LLVM_LIT_DEPENDS} ${LLVM_ADDITIONAL_TEST_TARGETS}
-      ARGS ${LLVM_LIT_EXTRA_ARGS}
-      )
+    umbrella_lit_testsuite_end(check-all)
   endif()
   add_subdirectory(utils/perf-training)
 endif()
diff --git a/clang/bindings/python/tests/CMakeLists.txt b/clang/bindings/python/tests/CMakeLists.txt
--- a/clang/bindings/python/tests/CMakeLists.txt
+++ b/clang/bindings/python/tests/CMakeLists.txt
@@ -46,5 +46,5 @@
 
 if(RUN_PYTHON_TESTS)
     set_property(GLOBAL APPEND PROPERTY
-                 LLVM_ADDITIONAL_TEST_TARGETS check-clang-python)
+                 LLVM_ALL_ADDITIONAL_TEST_TARGETS check-clang-python)
 endif()
diff --git a/clang/runtime/CMakeLists.txt b/clang/runtime/CMakeLists.txt
--- a/clang/runtime/CMakeLists.txt
+++ b/clang/runtime/CMakeLists.txt
@@ -164,7 +164,7 @@
       DEPENDS compiler-rt-build ${COMPILER_RT_TEST_DEPENDENCIES}
       WORKING_DIRECTORY ${BINARY_DIR}
       VERBATIM USES_TERMINAL)
-    set_property(GLOBAL APPEND PROPERTY LLVM_ADDITIONAL_TEST_DEPENDS compiler-rt-test-depends)
-    set_property(GLOBAL APPEND PROPERTY LLVM_ADDITIONAL_TEST_TARGETS check-compiler-rt)
+    set_property(GLOBAL APPEND PROPERTY LLVM_ALL_ADDITIONAL_TEST_DEPENDS compiler-rt-test-depends)
+    set_property(GLOBAL APPEND PROPERTY LLVM_ALL_ADDITIONAL_TEST_TARGETS check-compiler-rt)
   endif()
 endif()
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
@@ -44,6 +44,10 @@
   endif()
 endif()
 
+if(COMPILER_RT_STANDALONE_BUILD)
+  umbrella_lit_testsuite_begin(check-compiler-rt)
+endif()
+
 function(compiler_rt_test_runtime runtime)
   string(TOUPPER ${runtime} runtime_uppercase)
   if(COMPILER_RT_HAS_${runtime_uppercase})
@@ -103,15 +107,11 @@
 if(COMPILER_RT_STANDALONE_BUILD)
   # Now that we've traversed all the directories and know all the lit testsuites,
   # introduce a rule to run to run all of them.
-  get_property(LLVM_LIT_TESTSUITES GLOBAL PROPERTY LLVM_LIT_TESTSUITES)
-  get_property(LLVM_LIT_DEPENDS GLOBAL PROPERTY LLVM_LIT_DEPENDS)
-  add_lit_target(check-compiler-rt
-    "Running all regression tests"
-    ${LLVM_LIT_TESTSUITES}
-    DEPENDS ${LLVM_LIT_DEPENDS})
+  add_custom_target(compiler-rt-test-depends DEPENDS ${LLVM_COMPILER_RT_LIT_DEPENDS})
+  umbrella_lit_testsuite_end(check-compiler-rt)
+
   if(NOT TARGET check-all)
     add_custom_target(check-all)
   endif()
-  add_custom_target(compiler-rt-test-depends DEPENDS ${LLVM_LIT_DEPENDS})
   add_dependencies(check-all check-compiler-rt)
 endif()
diff --git a/llvm/CMakeLists.txt b/llvm/CMakeLists.txt
--- a/llvm/CMakeLists.txt
+++ b/llvm/CMakeLists.txt
@@ -1063,6 +1063,10 @@
   llvm_replace_compiler_option(CMAKE_CXX_FLAGS_RELEASE "-O3" "-O2")
 endif()
 
+if(LLVM_INCLUDE_TESTS)
+  umbrella_lit_testsuite_begin(check-all)
+endif()
+
 # Put this before tblgen. Else we have a circular dependence.
 add_subdirectory(lib/Demangle)
 add_subdirectory(lib/Support)
@@ -1134,25 +1138,12 @@
     add_subdirectory(utils/KillTheDoctor)
   endif()
 
-  # Add a global check rule now that all subdirectories have been traversed
-  # and we know the total set of lit testsuites.
-  get_property(LLVM_LIT_TESTSUITES GLOBAL PROPERTY LLVM_LIT_TESTSUITES)
-  get_property(LLVM_LIT_PARAMS GLOBAL PROPERTY LLVM_LIT_PARAMS)
-  get_property(LLVM_LIT_DEPENDS GLOBAL PROPERTY LLVM_LIT_DEPENDS)
-  get_property(LLVM_LIT_EXTRA_ARGS GLOBAL PROPERTY LLVM_LIT_EXTRA_ARGS)
-  get_property(LLVM_ADDITIONAL_TEST_TARGETS
-               GLOBAL PROPERTY LLVM_ADDITIONAL_TEST_TARGETS)
-  get_property(LLVM_ADDITIONAL_TEST_DEPENDS
-               GLOBAL PROPERTY LLVM_ADDITIONAL_TEST_DEPENDS)
-  add_lit_target(check-all
-    "Running all regression tests"
-    ${LLVM_LIT_TESTSUITES}
-    PARAMS ${LLVM_LIT_PARAMS}
-    DEPENDS ${LLVM_LIT_DEPENDS} ${LLVM_ADDITIONAL_TEST_TARGETS}
-    ARGS ${LLVM_LIT_EXTRA_ARGS}
-    )
+  umbrella_lit_testsuite_end(check-all)
+  get_property(LLVM_ALL_LIT_DEPENDS GLOBAL PROPERTY LLVM_ALL_LIT_DEPENDS)
+  get_property(LLVM_ALL_ADDITIONAL_TEST_DEPENDS
+      GLOBAL PROPERTY LLVM_ALL_ADDITIONAL_TEST_DEPENDS)
   add_custom_target(test-depends
-                    DEPENDS ${LLVM_LIT_DEPENDS} ${LLVM_ADDITIONAL_TEST_DEPENDS})
+      DEPENDS ${LLVM_ALL_LIT_DEPENDS} ${LLVM_ALL_ADDITIONAL_TEST_DEPENDS})
   set_target_properties(test-depends PROPERTIES FOLDER "Tests")
 endif()
 
diff --git a/llvm/cmake/modules/AddLLVM.cmake b/llvm/cmake/modules/AddLLVM.cmake
--- a/llvm/cmake/modules/AddLLVM.cmake
+++ b/llvm/cmake/modules/AddLLVM.cmake
@@ -1824,17 +1824,62 @@
   set_target_properties(${target} PROPERTIES EXCLUDE_FROM_DEFAULT_BUILD ON)
 endfunction()
 
+# Convert a target name like check-clang to a variable name like CLANG.
+function(umbrella_lit_testsuite_var target outvar)
+  if (NOT target MATCHES "^check-")
+    message(FATAL_ERROR "umbrella lit suites must be check-*, not '${target}'")
+  endif()
+  string(SUBSTRING "${target}" 6 -1 var)
+  string(REPLACE "-" "_" var ${var})
+  string(TOUPPER "${var}" var)
+  set(${outvar} "${var}" PARENT_SCOPE)
+endfunction()
+
+# Start recording all lit test suites for a combined 'check-foo' target.
+# The recording continues until umbrella_lit_testsuite_end() creates the target.
+function(umbrella_lit_testsuite_begin target)
+  umbrella_lit_testsuite_var(${target} name)
+  set_property(GLOBAL APPEND PROPERTY LLVM_LIT_UMBRELLAS ${name})
+endfunction()
+
+# Create a combined 'check-foo' target for a set of related test suites.
+# It runs all suites added since the matching umbrella_lit_testsuite_end() call.
+# Tests marked EXCLUDE_FROM_CHECK_ALL are not gathered.
+function(umbrella_lit_testsuite_end target)
+  umbrella_lit_testsuite_var(${target} name)
+
+  get_property(testsuites GLOBAL PROPERTY LLVM_${name}_LIT_TESTSUITES)
+  get_property(params GLOBAL PROPERTY LLVM_${name}_LIT_PARAMS)
+  get_property(depends GLOBAL PROPERTY LLVM_${name}_LIT_DEPENDS)
+  get_property(extra_args GLOBAL PROPERTY LLVM_${name}_LIT_EXTRA_ARGS)
+  # Additional test targets are not gathered, but may be set externally.
+  get_property(additional_test_targets
+               GLOBAL PROPERTY LLVM_${name}_ADDITIONAL_TEST_TARGETS)
+
+  string(TOLOWER ${name} name)
+  add_lit_target(${target}
+    "Running ${name} regression tests"
+    ${testsuites}
+    PARAMS ${params}
+    DEPENDS ${depends} ${additional_test_targets}
+    ARGS ${extra_args}
+    )
+endfunction()
+
 # A function to add a set of lit test suites to be driven through 'check-*' targets.
 function(add_lit_testsuite target comment)
   cmake_parse_arguments(ARG "EXCLUDE_FROM_CHECK_ALL" "" "PARAMS;DEPENDS;ARGS" ${ARGN})
 
   # EXCLUDE_FROM_ALL excludes the test ${target} out of check-all.
   if(NOT ARG_EXCLUDE_FROM_CHECK_ALL)
-    # Register the testsuites, params and depends for the global check rule.
-    set_property(GLOBAL APPEND PROPERTY LLVM_LIT_TESTSUITES ${ARG_UNPARSED_ARGUMENTS})
-    set_property(GLOBAL APPEND PROPERTY LLVM_LIT_PARAMS ${ARG_PARAMS})
-    set_property(GLOBAL APPEND PROPERTY LLVM_LIT_DEPENDS ${ARG_DEPENDS})
-    set_property(GLOBAL APPEND PROPERTY LLVM_LIT_EXTRA_ARGS ${ARG_ARGS})
+    get_property(gather_names GLOBAL PROPERTY LLVM_LIT_UMBRELLAS)
+    foreach(name ${gather_names})
+    # Register the testsuites, params and depends for the umbrella check rule.
+      set_property(GLOBAL APPEND PROPERTY LLVM_${name}_LIT_TESTSUITES ${ARG_UNPARSED_ARGUMENTS})
+      set_property(GLOBAL APPEND PROPERTY LLVM_${name}_LIT_PARAMS ${ARG_PARAMS})
+      set_property(GLOBAL APPEND PROPERTY LLVM_${name}_LIT_DEPENDS ${ARG_DEPENDS})
+      set_property(GLOBAL APPEND PROPERTY LLVM_${name}_LIT_EXTRA_ARGS ${ARG_ARGS})
+    endforeach()
   endif()
 
   # Produce a specific suffixed check rule.
diff --git a/llvm/runtimes/CMakeLists.txt b/llvm/runtimes/CMakeLists.txt
--- a/llvm/runtimes/CMakeLists.txt
+++ b/llvm/runtimes/CMakeLists.txt
@@ -222,9 +222,9 @@
   if(LLVM_INCLUDE_TESTS)
     include(${LLVM_BINARY_DIR}/runtimes/Tests.cmake OPTIONAL)
     set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS ${LLVM_BINARY_DIR}/runtimes/Tests.cmake)
-    set_property(GLOBAL APPEND PROPERTY LLVM_LIT_TESTSUITES ${SUB_LIT_TESTSUITES})
-    set_property(GLOBAL APPEND PROPERTY LLVM_LIT_PARAMS ${SUB_LIT_PARAMS})
-    set_property(GLOBAL APPEND PROPERTY LLVM_LIT_EXTRA_ARGS ${SUB_LIT_EXTRA_ARGS})
+    set_property(GLOBAL APPEND PROPERTY LLVM_ALL_LIT_TESTSUITES ${SUB_LIT_TESTSUITES})
+    set_property(GLOBAL APPEND PROPERTY LLVM_ALL_LIT_PARAMS ${SUB_LIT_PARAMS})
+    set_property(GLOBAL APPEND PROPERTY LLVM_ALL_LIT_EXTRA_ARGS ${SUB_LIT_EXTRA_ARGS})
     list(APPEND test_targets runtimes-test-depends check-runtimes)
   endif()
 
@@ -304,9 +304,9 @@
   if(LLVM_INCLUDE_TESTS)
     include(${LLVM_BINARY_DIR}/runtimes/${name}/Tests.cmake OPTIONAL)
     set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS ${LLVM_BINARY_DIR}/runtimes/${name}/Tests.cmake)
-    set_property(GLOBAL APPEND PROPERTY LLVM_LIT_TESTSUITES ${SUB_LIT_TESTSUITES})
-    set_property(GLOBAL APPEND PROPERTY LLVM_LIT_PARAMS ${SUB_LIT_PARAMS})
-    set_property(GLOBAL APPEND PROPERTY LLVM_LIT_EXTRA_ARGS ${SUB_LIT_EXTRA_ARGS})
+    set_property(GLOBAL APPEND PROPERTY LLVM_ALL_LIT_TESTSUITES ${SUB_LIT_TESTSUITES})
+    set_property(GLOBAL APPEND PROPERTY LLVM_ALL_LIT_PARAMS ${SUB_LIT_PARAMS})
+    set_property(GLOBAL APPEND PROPERTY LLVM_ALL_LIT_EXTRA_ARGS ${SUB_LIT_EXTRA_ARGS})
     set(runtimes-test-depends-${name} runtimes-test-depends)
     set(check-runtimes-${name} check-runtimes)
     list(APPEND ${name}_test_targets runtimes-test-depends-${name} check-runtimes-${name})
@@ -479,7 +479,7 @@
   endif()
 
   if(LLVM_INCLUDE_TESTS)
-    set_property(GLOBAL APPEND PROPERTY LLVM_ADDITIONAL_TEST_DEPENDS runtimes-test-depends)
+    set_property(GLOBAL APPEND PROPERTY LLVM_ALL_ADDITIONAL_TEST_DEPENDS runtimes-test-depends)
 
     set(RUNTIMES_TEST_DEPENDS
         FileCheck
diff --git a/runtimes/CMakeLists.txt b/runtimes/CMakeLists.txt
--- a/runtimes/CMakeLists.txt
+++ b/runtimes/CMakeLists.txt
@@ -176,6 +176,8 @@
     set(LIT_ARGS_DEFAULT "${LIT_ARGS_DEFAULT} --no-progress-bar")
   endif()
   set(LLVM_LIT_ARGS "${LIT_ARGS_DEFAULT}" CACHE STRING "Default options for lit")
+
+  umbrella_lit_testsuite_begin(check-runtimes)
 endif()
 
 # llvm-libgcc incorporates both compiler-rt and libunwind as subprojects with very
@@ -200,36 +202,13 @@
 foreach(entry ${runtimes})
   get_filename_component(projName ${entry} NAME)
 
-  # Between each sub-project we want to cache and clear the LIT properties
-  set_property(GLOBAL PROPERTY LLVM_LIT_TESTSUITES)
-  set_property(GLOBAL PROPERTY LLVM_LIT_PARAMS)
-  set_property(GLOBAL PROPERTY LLVM_LIT_DEPENDS)
-  set_property(GLOBAL PROPERTY LLVM_LIT_EXTRA_ARGS)
-
   add_subdirectory(${entry} ${projName})
-
-  get_property(LLVM_LIT_TESTSUITES GLOBAL PROPERTY LLVM_LIT_TESTSUITES)
-  get_property(LLVM_LIT_PARAMS GLOBAL PROPERTY LLVM_LIT_PARAMS)
-  get_property(LLVM_LIT_DEPENDS GLOBAL PROPERTY LLVM_LIT_DEPENDS)
-  get_property(LLVM_LIT_EXTRA_ARGS GLOBAL PROPERTY LLVM_LIT_EXTRA_ARGS)
-
-  list(APPEND RUNTIMES_LIT_TESTSUITES ${LLVM_LIT_TESTSUITES})
-  list(APPEND RUNTIMES_LIT_PARAMS ${LLVM_LIT_PARAMS})
-  list(APPEND RUNTIMES_LIT_DEPENDS ${LLVM_LIT_DEPENDS})
-  list(APPEND RUNTIMES_LIT_EXTRA_ARGS ${LLVM_LIT_EXTRA_ARGS})
 endforeach()
 
 if(LLVM_INCLUDE_TESTS)
   # Add a global check rule now that all subdirectories have been traversed
   # and we know the total set of lit testsuites.
-  add_lit_target(check-runtimes
-    "Running all regression tests"
-    ${RUNTIMES_LIT_TESTSUITES}
-    PARAMS ${RUNTIMES_LIT_PARAMS}
-    DEPENDS ${RUNTIMES_LIT_DEPENDS}
-    ARGS ${RUNTIMES_LIT_EXTRA_ARGS}
-    )
-  add_custom_target(runtimes-test-depends DEPENDS ${RUNTIMES_LIT_DEPENDS})
+  umbrella_lit_testsuite_end(check-runtimes)
 
   if (NOT HAVE_LLVM_LIT)
     # If built by manually invoking cmake on this directory, we don't have
diff --git a/runtimes/Tests.cmake.in b/runtimes/Tests.cmake.in
--- a/runtimes/Tests.cmake.in
+++ b/runtimes/Tests.cmake.in
@@ -1,3 +1,3 @@
-set(SUB_LIT_TESTSUITES @RUNTIMES_LIT_TESTSUITES@)
-set(SUB_LIT_PARAMS @RUNTIMES_LIT_PARAMS@)
-set(SUB_LIT_EXTRA_ARGS @RUNTIMES_LIT_EXTRA_ARGS@)
+set(SUB_LIT_TESTSUITES @LLVM_RUNTIMES_LIT_TESTSUITES@)
+set(SUB_LIT_PARAMS @LLVM_RUNTIMES_LIT_PARAMS@)
+set(SUB_LIT_EXTRA_ARGS @LLVM_RUNTIMES_LIT_EXTRA_ARGS@)