lldb: Disable unittests if llvm_gtest target does not exist

This fixes the stand-alone build configuration where LLVM_MAIN_SRC_DIR
does not exist.

Reviewed By: JDevlieghere

Differential Revision: https://reviews.llvm.org/D124314

Author: tstellar

lldb/CMakeLists.txt

@@ -124,10 +124,17 @@ if (LLDB_ENABLE_LUA)
   finish_swig_lua("lldb-lua" "${lldb_lua_bindings_dir}" "${lldb_lua_target_dir}")
 endif()
 
+set(LLDB_INCLUDE_UNITTESTS ON)
+if (NOT TARGET llvm_gtest)
+  set(LLDB_INCLUDE_UNITTESTS OFF)
+endif()
+
 option(LLDB_INCLUDE_TESTS "Generate build targets for the LLDB unit tests." ${LLVM_INCLUDE_TESTS})
 if(LLDB_INCLUDE_TESTS)
   add_subdirectory(test)
-  add_subdirectory(unittests)
+  if (LLDB_INCLUDE_UNITTESTS)
+    add_subdirectory(unittests)
+  endif()
   add_subdirectory(utils)
 endif()
 

lldb/cmake/modules/LLDBStandalone.cmake

@@ -97,6 +97,18 @@ include(LLVMDistributionSupport)
 set(PACKAGE_VERSION "${LLVM_PACKAGE_VERSION}")
 set(LLVM_INCLUDE_TESTS ON CACHE INTERNAL "")
 
+# Build the gtest library needed for unittests, if we have LLVM sources
+# handy.
+if (EXISTS ${LLVM_MAIN_SRC_DIR}/utils/unittest AND NOT TARGET llvm_gtest)
+  add_subdirectory(${LLVM_MAIN_SRC_DIR}/utils/unittest utils/unittest)
+endif()
+# LLVMTestingSupport library is needed for Process/gdb-remote.
+if (EXISTS ${LLVM_MAIN_SRC_DIR}/lib/Testing/Support
+    AND NOT TARGET LLVMTestingSupport)
+  add_subdirectory(${LLVM_MAIN_SRC_DIR}/lib/Testing/Support
+    lib/Testing/Support)
+endif()
+
 option(LLVM_USE_FOLDERS "Enable solution folders in Visual Studio. Disable for Express versions." ON)
 if(LLVM_USE_FOLDERS)
   set_property(GLOBAL PROPERTY USE_FOLDERS ON)

lldb/unittests/CMakeLists.txt

@@ -17,20 +17,6 @@ else ()
   list(APPEND LLVM_COMPILE_FLAGS -include ${LLDB_GTEST_COMMON_INCLUDE})
 endif ()
 
-if (LLDB_BUILT_STANDALONE)
-  # Build the gtest library needed for unittests, if we have LLVM sources
-  # handy.
-  if (EXISTS ${LLVM_MAIN_SRC_DIR}/utils/unittest AND NOT TARGET llvm_gtest)
-    add_subdirectory(${LLVM_MAIN_SRC_DIR}/utils/unittest utils/unittest)
-  endif()
-  # LLVMTestingSupport library is needed for Process/gdb-remote.
-  if (EXISTS ${LLVM_MAIN_SRC_DIR}/lib/Testing/Support
-      AND NOT TARGET LLVMTestingSupport)
-    add_subdirectory(${LLVM_MAIN_SRC_DIR}/lib/Testing/Support
-      lib/Testing/Support)
-  endif()
-endif()
-
 function(add_lldb_unittest test_name)
   cmake_parse_arguments(ARG
     ""