The SCons build doesn't do this, so neither should CMake Excpetions are already handled by DISABLE_EXCEPTIONS option (cherry picked from commit 43690cb60b29c7668f7e9760cf766f7982637c77)
@@ -23,7 +23,6 @@ function(web_generate)
PUBLIC #
-sSIDE_MODULE
-sSUPPORT_LONGJMP=wasm
- -fno-exceptions
$<${THREADS_ENABLED}:-sUSE_PTHREADS=1>
)