From 27e66118bfbbac685b2ceb11e09c45209f9a510c Mon Sep 17 00:00:00 2001
From: Davide Cavalca <dcavalca@fb.com>
Date: Wed, 18 Nov 2020 09:54:32 -0800
Subject: [PATCH] wdt: fix gtest integration

Summary: Use a system gtest if one is available

Reviewed By: filbranden

Differential Revision: D25059075

fbshipit-source-id: 46ebfb1298529bbf3ada22e31f2ce19413c38852
---
 CMakeLists.txt | 60 +++++++++++++++++++++++---------------------------
 1 file changed, 28 insertions(+), 32 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index de2da967..74078c9c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -288,39 +288,35 @@ install(PROGRAMS test/wcp.sh DESTINATION bin RENAME wcp)
 if (BUILD_TESTING)
 
   enable_testing()
-  include(ExternalProject)
-
-  # GTest
-  #  from https://github.com/google/googletest/tree/master/googletest
-  configure_file(CMakeLists.txt.in googletest-download/CMakeLists.txt)
-  execute_process(COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}" .
-    RESULT_VARIABLE result
-    WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/googletest-download )
-  if(result)
-    message(FATAL_ERROR "CMake step for googletest failed: ${result}")
-  endif()
-  execute_process(COMMAND ${CMAKE_COMMAND} --build .
-    RESULT_VARIABLE result
-    WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/googletest-download )
-  if(result)
-    message(FATAL_ERROR "Build step for googletest failed: ${result}")
-  endif()
+  find_package(GTest CONFIG REQUIRED)
+  if(NOT GTest_FOUND)
+    include(ExternalProject)
+
+    # GTest
+    #  from https://github.com/google/googletest/tree/master/googletest
+    configure_file(CMakeLists.txt.in googletest-download/CMakeLists.txt)
+    execute_process(COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}" .
+      RESULT_VARIABLE result
+      WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/googletest-download )
+    if(result)
+      message(FATAL_ERROR "CMake step for googletest failed: ${result}")
+    endif()
+    execute_process(COMMAND ${CMAKE_COMMAND} --build .
+      RESULT_VARIABLE result
+      WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/googletest-download )
+    if(result)
+      message(FATAL_ERROR "Build step for googletest failed: ${result}")
+    endif()
+
+    # Prevent overriding the parent project's compiler/linker
+    # settings on Windows
+    set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
 
-  # Prevent overriding the parent project's compiler/linker
-  # settings on Windows
-  set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
-
-  # Add googletest directly to our build. This defines
-  # the gtest and gtest_main targets.
-  add_subdirectory(${CMAKE_CURRENT_BINARY_DIR}/googletest-src
-                   ${CMAKE_CURRENT_BINARY_DIR}/googletest-build
-                   EXCLUDE_FROM_ALL)
-
-  # The gtest/gtest_main targets carry header search path
-  # dependencies automatically when using CMake 2.8.11 or
-  # later. Otherwise we have to add them here ourselves.
-  if (CMAKE_VERSION VERSION_LESS 2.8.11)
-    include_directories("${gtest_SOURCE_DIR}/include")
+    # Add googletest directly to our build. This defines
+    # the gtest and gtest_main targets.
+    add_subdirectory(${CMAKE_CURRENT_BINARY_DIR}/googletest-src
+                     ${CMAKE_CURRENT_BINARY_DIR}/googletest-build
+                     EXCLUDE_FROM_ALL)
   endif()
 
   # Extra code that we use in tests