Move googletest to the third-party directory

This will help improve the project's layering, so that sub-projects
that don't actually need any llvm code can still use googletest
without having to reference code in the llvm directory.

This will also make it easier to consolidate and simplify the standalone
build configurations.

Reviewed By: stellaraccident, lattner, probinson, phosek

Differential Revision: https://reviews.llvm.org/D131919

clang/CMakeLists.txt

@@ -111,11 +111,11 @@ if(CLANG_BUILT_STANDALONE)
         set(LLVM_UTILS_PROVIDED ON)
         set(CLANG_TEST_DEPS FileCheck count not)
       endif()
-      set(UNITTEST_DIR ${LLVM_MAIN_SRC_DIR}/utils/unittest)
+      set(UNITTEST_DIR ${LLVM_THIRD_PARTY_DIR}/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} utils/unittest)
+        add_subdirectory(${UNITTEST_DIR} third-party/unittest)
       endif()
     endif()
 
@@ -526,7 +526,7 @@ endif()
 
 
 if( CLANG_INCLUDE_TESTS )
-  if(EXISTS ${LLVM_MAIN_SRC_DIR}/utils/unittest/googletest/include/gtest/gtest.h)
+  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

compiler-rt/CMakeLists.txt

@@ -639,7 +639,7 @@ elseif (SANITIZER_TEST_CXX_LIBNAME STREQUAL "libstdc++")
 endif()
 
 # Unittests support.
-set(COMPILER_RT_GTEST_PATH ${LLVM_MAIN_SRC_DIR}/utils/unittest/googletest)
+set(COMPILER_RT_GTEST_PATH ${LLVM_THIRD_PARTY_DIR}/unittest/googletest)
 set(COMPILER_RT_GTEST_SOURCE ${COMPILER_RT_GTEST_PATH}/src/gtest-all.cc)
 set(COMPILER_RT_GTEST_CFLAGS
   -DGTEST_NO_LLVM_SUPPORT=1
@@ -649,7 +649,7 @@ set(COMPILER_RT_GTEST_CFLAGS
 )
 
 # Mocking support.
-set(COMPILER_RT_GMOCK_PATH ${LLVM_MAIN_SRC_DIR}/utils/unittest/googlemock)
+set(COMPILER_RT_GMOCK_PATH ${LLVM_THIRD_PATY_DIR}/unittest/googlemock)
 set(COMPILER_RT_GMOCK_SOURCE ${COMPILER_RT_GMOCK_PATH}/src/gmock-all.cc)
 set(COMPILER_RT_GMOCK_CFLAGS
   -DGTEST_NO_LLVM_SUPPORT=1

lld/CMakeLists.txt

@@ -68,11 +68,11 @@ if(LLD_BUILT_STANDALONE)
         set(LLVM_UTILS_PROVIDED ON)
         set(LLD_TEST_DEPS FileCheck not)
       endif()
-      set(UNITTEST_DIR ${LLVM_MAIN_SRC_DIR}/utils/unittest)
+      set(UNITTEST_DIR ${LLVM_THIRD_PARTY_DIR}/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} utils/unittest)
+        add_subdirectory(${UNITTEST_DIR} third-party/unittest)
       endif()
     else()
       # Seek installed Lit.

lldb/cmake/modules/LLDBStandalone.cmake

@@ -100,8 +100,8 @@ include_directories(
 if(LLDB_INCLUDE_TESTS)
   # 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)
+  if (EXISTS ${LLVM_THIRD_PARTY_DIR}/unittest AND NOT TARGET llvm_gtest)
+    add_subdirectory(${LLVM_THIRD_PARTY_DIR}}/utils/unittest third-party/unittest)
   endif()
   # LLVMTestingSupport library is needed for Process/gdb-remote.
   if (EXISTS ${LLVM_MAIN_SRC_DIR}/lib/Testing/Support

llvm/CMakeLists.txt

@@ -401,7 +401,6 @@ set(LLVM_MAIN_SRC_DIR     ${CMAKE_CURRENT_SOURCE_DIR}  ) # --src-root
 set(LLVM_MAIN_INCLUDE_DIR ${LLVM_MAIN_SRC_DIR}/include ) # --includedir
 set(LLVM_BINARY_DIR       ${CMAKE_CURRENT_BINARY_DIR}  ) # --prefix
 
-set(LLVM_THIRD_PARTY_DIR  ${CMAKE_CURRENT_SOURCE_DIR}/../third-party)
 
 # Note: LLVM_CMAKE_DIR does not include generated files
 set(LLVM_CMAKE_DIR ${LLVM_MAIN_SRC_DIR}/cmake/modules)
@@ -1194,7 +1193,7 @@ if( LLVM_INCLUDE_UTILS )
   add_subdirectory(utils/yaml-bench)
   add_subdirectory(utils/split-file)
   if( LLVM_INCLUDE_TESTS )
-    add_subdirectory(utils/unittest)
+    add_subdirectory(${LLVM_THIRD_PARTY_DIR}/unittest ${CMAKE_CURRENT_BINARY_DIR}/third-party/unittest)
   endif()
 else()
   if ( LLVM_INCLUDE_TESTS )

llvm/cmake/modules/HandleLLVMOptions.cmake

@@ -1260,3 +1260,6 @@ if(LLVM_USE_RELATIVE_PATHS_IN_FILES)
   append_if(SUPPORTS_FFILE_PREFIX_MAP "-ffile-prefix-map=${source_root}/=${LLVM_SOURCE_PREFIX}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
   add_flag_if_supported("-no-canonical-prefixes" NO_CANONICAL_PREFIXES)
 endif()
+
+set(LLVM_THIRD_PARTY_DIR  ${CMAKE_CURRENT_SOURCE_DIR}/../third-party CACHE STRING
+    "Directory containing third party software used by LLVM (e.g. googletest)")

mlir/CMakeLists.txt

@@ -25,11 +25,9 @@ if(MLIR_STANDALONE_BUILD)
 
   include_directories(${LLVM_INCLUDE_DIRS})
 
-  set(LLVM_MAIN_SRC_DIR ${CMAKE_SOURCE_DIR}/../llvm CACHE PATH
-      "Path to LLVM source tree")
-  set(UNITTEST_DIR ${LLVM_MAIN_SRC_DIR}/utils/unittest)
+  set(UNITTEST_DIR ${LLVM_THIRD_PARTY_DIR}/unittest)
   if(EXISTS ${UNITTEST_DIR}/googletest/include/gtest/gtest.h)
-    add_subdirectory(${UNITTEST_DIR} utils/unittest)
+    add_subdirectory(${UNITTEST_DIR} third-party/unittest)
   endif()
 
   set(CMAKE_LIBRARY_OUTPUT_DIRECTORY
@@ -178,7 +176,7 @@ add_subdirectory(lib/CAPI)
 if (MLIR_INCLUDE_TESTS)
   add_definitions(-DMLIR_INCLUDE_TESTS)
   add_custom_target(MLIRUnitTests)
-  if (EXISTS ${LLVM_MAIN_SRC_DIR}/utils/unittest/googletest/include/gtest/gtest.h)
+  if (EXISTS ${LLVM_THIRD_PARTY_DIR}/unittest/googletest/include/gtest/gtest.h)
     add_subdirectory(unittests)
   else()
     message(WARNING "gtest not found, unittests will not be available")

polly/CMakeLists.txt

@@ -28,10 +28,10 @@ if(POLLY_STANDALONE_BUILD)
 
   # Enable unit tests if available.
   set(POLLY_GTEST_AVAIL 0)
-  set(UNITTEST_DIR ${LLVM_SOURCE_ROOT}/utils/unittest)
+  set(UNITTEST_DIR ${LLVM_THIRD_PARTY_DIR}/unittest)
   if(EXISTS ${UNITTEST_DIR}/googletest/include/gtest/gtest.h)
     if (NOT TARGET gtest)
-      add_subdirectory(${UNITTEST_DIR} utils/unittest)
+      add_subdirectory(${UNITTEST_DIR} third-party/unittest)
     endif()
     set(POLLY_GTEST_AVAIL 1)
   endif()