Update gtest used to v1.15.2 (#344)

Author: mcbarton

CMakeLists.txt

@@ -299,7 +299,11 @@ endif()
 
 # Add appropriate flags for GCC
 if (LLVM_COMPILER_IS_GCC_COMPATIBLE)
-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-common -Woverloaded-virtual -Wcast-qual -fno-strict-aliasing -pedantic -Wno-long-long -Wall -W -Wno-unused-parameter -Wwrite-strings")
+  if (APPLE)
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-common -Woverloaded-virtual -Wcast-qual -fno-strict-aliasing -Wno-long-long -Wall -W -Wno-unused-parameter -Wwrite-strings")
+  else()
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-common -Woverloaded-virtual -Wcast-qual -fno-strict-aliasing -pedantic -Wno-long-long -Wall -W -Wno-unused-parameter -Wwrite-strings")
+  endif ()
 endif ()
 
 # Fixes "C++ exception handler used, but unwind semantics are not enabled" warning Windows

cmake/modules/GoogleTest.cmake

@@ -24,7 +24,7 @@ ExternalProject_Add(
   googletest
   GIT_REPOSITORY https://github.com/google/googletest.git
   GIT_SHALLOW 1
-  GIT_TAG release-1.12.1
+  GIT_TAG v1.15.2
   UPDATE_COMMAND ""
   # # Force separate output paths for debug and release builds to allow easy
   # # identification of correct lib in subsequent TARGET_LINK_LIBRARIES commands