Undefined symbol errors when build Emscripten tests for emsdk version 4.0.9

[mcbarton]

I started investigated xeus-cpp with emsdk version 4.0.9, and got the following undefined symbol errors when building the test executable

error: undefined symbol: _Unwind_CallPersonality (referenced by root reference (e.g. compiled C/C++ code))
warning: To disable errors for undefined symbols use `-sERROR_ON_UNDEFINED_SYMBOLS=0`
warning: __Unwind_CallPersonality may need to be added to EXPORTED_FUNCTIONS if it arrives from a system library
error: undefined symbol: __cpp_exception (referenced by root reference (e.g. compiled C/C++ code))
warning: ___cpp_exception may need to be added to EXPORTED_FUNCTIONS if it arrives from a system library
error: undefined symbol: __wasm_lpad_context (referenced by root reference (e.g. compiled C/C++ code))
warning: ___wasm_lpad_context may need to be added to EXPORTED_FUNCTIONS if it arrives from a system library
Error: Aborting compilation due to previous errors

This may be something @anutosh491 has already spotted with his investigations, but thought I would raise the issue anyway.

[mcbarton]

These undefined symbol errors disappear changing the test executables flag from -fexceptions to -fwasm-exceptions which I believe was mentioned to me on Discord.

[anutosh491]

from -fexceptions to -fwasm-exceptions which I believe was mentioned to me on Discord.

That's correct, I think on emscripten-forge we are switching from -fexceptions to -fwasm-exceptions for the whole stack as we're migrating to emscripten 4-x