Patch to make CMake 3.20.3 compile with clang-cl

clang-cl.patch

diff --git a/Source/CMakeLists.txt b/Source/CMakeLists.txt
index 6adc9cf6a8..e147951dd2 100644
--- a/Source/CMakeLists.txt
+++ b/Source/CMakeLists.txt
@@ -80,6 +80,12 @@ if(CMake_BUILD_DEVELOPER_REFERENCE)
     )
 endif()
 
+if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
+    if ("${CMAKE_CXX_SIMULATE_ID}" STREQUAL "MSVC")
+        ADD_COMPILE_OPTIONS("/EHs")
+    endif()
+endif()
+
 # configure the .h file
 configure_file(
   "${CMake_SOURCE_DIR}/Source/cmConfigure.cmake.h.in"
diff --git a/Utilities/cmjsoncpp/CMakeLists.txt b/Utilities/cmjsoncpp/CMakeLists.txt
index 74e998823c..7e378c28f5 100644
--- a/Utilities/cmjsoncpp/CMakeLists.txt
+++ b/Utilities/cmjsoncpp/CMakeLists.txt
@@ -20,6 +20,12 @@ include_directories(
   ${KWSYS_HEADER_ROOT}
   )
 
+if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
+  if ("${CMAKE_CXX_SIMULATE_ID}" STREQUAL "MSVC")
+    ADD_COMPILE_OPTIONS("/EHs")
+  endif()
+endif()
+
 add_library(cmjsoncpp ${JSONCPP_SOURCES})
 target_link_libraries(cmjsoncpp ${CMake_KWIML_LIBRARIES})
 set_property(TARGET cmjsoncpp PROPERTY CXX_INCLUDE_WHAT_YOU_USE "")