This is a more full featured version of --allow-undefined.
The semantics of the different methods are as follows:
Report all unresolved symbols. This is the default. Normally the linker will generate an error message for each reported unresolved symbol but the option `--warn-unresolved-symbols` can change this to a warning.
Resolve all undefined symbols to zero. For data and function addresses this is trivial. For direct function calls, the linker will generate a trapping stub function in place of the undefined function.
Generate WebAssembly imports for any undefined functions. Undefined data symbols are resolved to zero as in `ignore-all`. This corresponds the
The plan is to followup with a new mode called import-all which allows
for statically linked binaries to refer to both data and functions
symbols from the embedder.