update googletest to v1.8.1

Author: ladislas

UNITTESTS/CMakeLists.txt

@@ -52,8 +52,8 @@ add_subdirectory(${CMAKE_BINARY_DIR}/googletest-src
 # dependencies automatically when using CMake 2.8.11 or
 # later.
 target_include_directories(gmock_main SYSTEM BEFORE INTERFACE
-  "${gtest_SOURCE_DIR}/include"
-  "${gmock_SOURCE_DIR}/include")
+  "$<BUILD_INTERFACE:${gtest_SOURCE_DIR}/include>"
+  "$<BUILD_INTERFACE:${gmock_SOURCE_DIR}/include>")
 
 ####################
 # TESTING

UNITTESTS/googletest-CMakeLists.txt.in

@@ -5,7 +5,7 @@ project(googletest-download NONE)
 include(ExternalProject)
 ExternalProject_Add(googletest
   GIT_REPOSITORY    https://github.com/google/googletest.git
-  GIT_TAG           8bc11c040a1dcbe50c340b21d78175d152dd3837
+  GIT_TAG           release-1.8.1
   SOURCE_DIR        "${CMAKE_BINARY_DIR}/googletest-src"
   BINARY_DIR        "${CMAKE_BINARY_DIR}/googletest-build"
   CONFIGURE_COMMAND ""