Undefined symbols when building xcpp.js for emsdk 4.0.9 build

[mcbarton]

The following undefined symbol errors occur when building xcpp.js using emsdk 4.0.9 . Found in CppInterOp emsdk 4.0.9 PR here https://github.com/compiler-research/CppInterOp/actions/runs/19443476160/job/55632348748?pr=753#step:14:161

error: undefined symbol: _embind_register_bindings (referenced by root reference (e.g. compiled C/C++ code))
warning: To disable errors for undefined symbols use `-sERROR_ON_UNDEFINED_SYMBOLS=0`
warning: __embind_register_bindings may need to be added to EXPORTED_FUNCTIONS if it arrives from a system library
error: undefined symbol: _embind_register_class (referenced by root reference (e.g. compiled C/C++ code))
warning: __embind_register_class may need to be added to EXPORTED_FUNCTIONS if it arrives from a system library
error: undefined symbol: _embind_register_class_constructor (referenced by root reference (e.g. compiled C/C++ code))
warning: __embind_register_class_constructor may need to be added to EXPORTED_FUNCTIONS if it arrives from a system library
error: undefined symbol: _embind_register_class_function (referenced by root reference (e.g. compiled C/C++ code))
warning: __embind_register_class_function may need to be added to EXPORTED_FUNCTIONS if it arrives from a system library
error: undefined symbol: _embind_register_function (referenced by root reference (e.g. compiled C/C++ code))
warning: __embind_register_function may need to be added to EXPORTED_FUNCTIONS if it arrives from a system library
error: undefined symbol: _emval_as (referenced by root reference (e.g. compiled C/C++ code))
warning: __emval_as may need to be added to EXPORTED_FUNCTIONS if it arrives from a system library
error: undefined symbol: _emval_call (referenced by root reference (e.g. compiled C/C++ code))
warning: __emval_call may need to be added to EXPORTED_FUNCTIONS if it arrives from a system library
error: undefined symbol: _emval_call_method (referenced by root reference (e.g. compiled C/C++ code))
warning: __emval_call_method may need to be added to EXPORTED_FUNCTIONS if it arrives from a system library
error: undefined symbol: _emval_decref (referenced by root reference (e.g. compiled C/C++ code))
warning: __emval_decref may need to be added to EXPORTED_FUNCTIONS if it arrives from a system library
error: undefined symbol: _emval_get_global (referenced by root reference (e.g. compiled C/C++ code))
warning: __emval_get_global may need to be added to EXPORTED_FUNCTIONS if it arrives from a system library
error: undefined symbol: _emval_get_method_caller (referenced by root reference (e.g. compiled C/C++ code))
warning: __emval_get_method_caller may need to be added to EXPORTED_FUNCTIONS if it arrives from a system library
error: undefined symbol: _emval_get_module_property (referenced by root reference (e.g. compiled C/C++ code))
warning: __emval_get_module_property may need to be added to EXPORTED_FUNCTIONS if it arrives from a system library
error: undefined symbol: _emval_get_property (referenced by root reference (e.g. compiled C/C++ code))
warning: __emval_get_property may need to be added to EXPORTED_FUNCTIONS if it arrives from a system library
error: undefined symbol: _emval_incref (referenced by root reference (e.g. compiled C/C++ code))
warning: __emval_incref may need to be added to EXPORTED_FUNCTIONS if it arrives from a system library
error: undefined symbol: _emval_new_array (referenced by root reference (e.g. compiled C/C++ code))
warning: __emval_new_array may need to be added to EXPORTED_FUNCTIONS if it arrives from a system library
error: undefined symbol: _emval_new_cstring (referenced by root reference (e.g. compiled C/C++ code))
warning: __emval_new_cstring may need to be added to EXPORTED_FUNCTIONS if it arrives from a system library
error: undefined symbol: _emval_run_destructors (referenced by root reference (e.g. compiled C/C++ code))
warning: __emval_run_destructors may need to be added to EXPORTED_FUNCTIONS if it arrives from a system library
error: undefined symbol: _emval_set_property (referenced by root reference (e.g. compiled C/C++ code))
warning: __emval_set_property may need to be added to EXPORTED_FUNCTIONS if it arrives from a system library
error: undefined symbol: _emval_take_value (referenced by root reference (e.g. compiled C/C++ code))
warning: __emval_take_value may need to be added to EXPORTED_FUNCTIONS if it arrives from a system library
Error: Aborting compilation due to previous errors
em++: error: '/Users/runner/work/CppInterOp/CppInterOp/emsdk/node/22.16.0_64bit/bin/node /Users/runner/work/CppInterOp/CppInterOp/emsdk/upstream/emscripten/tools/compiler.mjs -' failed (returned 1)
make[2]: *** [xcpp.js] Error 1
make[1]: *** [CMakeFiles/xcpp.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....

Possibly has same solution as #412 . Haven't checked yet.

[anutosh491]

Nope, this comes because of some changes made to xeus (for experimentation I reckon to establish that 4-x is good enough for what we want)

Also the version used on the 4-x branch is 4.0.18