clang/cmake: Use installed gtest libraries for stand-alone builds

[kwk]

clang/CMakeLists.txt

103

I don't see no FindLLVMGTest.cmake file anywhere. Is that suppose to exist yet or which Patch is suppose to create it?

[tstellar]

clang/CMakeLists.txt

103

It's added in D137890. And it's called LLVMGTestConfig.cmake.

[kwk]

Working for me.

[phosek]

LGTM

clang/CMakeLists.txt

if(LLVM_INCLUDE_TESTS)
 
     # Seek installed Lit.
     find_program(LLVM_LIT
                  NAMES llvm-lit lit.py lit
                  PATHS "${LLVM_MAIN_SRC_DIR}/utils/lit"
                  DOC "Path to lit.py")
 
     if (LLVM_LIT AND LLVM_UTILS_PROVIDED)
-      set(UNITTEST_DIR ${LLVM_THIRD_PARTY_DIR}/utils/unittest)
-      if(EXISTS ${UNITTEST_DIR}/googletest/include/gtest/gtest.h
-         AND NOT EXISTS ${LLVM_LIBRARY_DIR}/${CMAKE_STATIC_LIBRARY_PREFIX}gtest${CMAKE_STATIC_LIBRARY_SUFFIX}
-         AND EXISTS ${UNITTEST_DIR}/CMakeLists.txt)
-        add_subdirectory(${UNITTEST_DIR} third-part/unittest)
+      find_package(LLVMGTest)
+      if (NOT TARGET llvm_gtest)
+         message(FATAL_ERROR "llvm-gtest not found.  Please install llvm-gtest or disable tests with -DLLVM_INCLUDE_TESTS=OFF")
       endif()
 
       # Define the default arguments to use with 'lit', and an option for the user
       # to override.
       set(LIT_ARGS_DEFAULT "-sv")
       if (MSVC OR XCODE)
         set(LIT_ARGS_DEFAULT "${LIT_ARGS_DEFAULT} --no-progress-bar")
       endif()
if(NOT EXISTS ${CLANG_ORDER_FILE})
     else()
       message(FATAL_ERROR "Specified order file '${CLANG_ORDER_FILE}' does not exist.")
     endif()
   endif()
 endif()
 
 
 if( CLANG_INCLUDE_TESTS )
-  if(EXISTS ${LLVM_THIRD_PARTY_DIR}/unittest/googletest/include/gtest/gtest.h)
-    add_subdirectory(unittests)
-    list(APPEND CLANG_TEST_DEPS ClangUnitTests)
-    list(APPEND CLANG_TEST_PARAMS
-      clang_unit_site_config=${CMAKE_CURRENT_BINARY_DIR}/test/Unit/lit.site.cfg
-      )
-  endif()
   add_subdirectory(test)
   add_subdirectory(bindings/python/tests)
 
   if(CLANG_BUILT_STANDALONE)
     umbrella_lit_testsuite_end(check-all)
   endif()
   add_subdirectory(utils/perf-training)
 endif()