Linking entire libstdc++ to a SIDE_MODULE

I'm looking into building [PostGIS](https://postgis.net) for [PGlite](https://pglite.dev) (PostgreSQL in WASM) - more [here](https://github.com/electric-sql/pglite/issues/803). This is a C++ extension, the first of the kind that PGlite would support.

I want to know if it is possible to statically link `libstdc++` to it such that we wouldn't have to link `libstdc++` to PGlite itself. This is in order to save space for everyone who's not interested in this extension. Something like `-Wl,--whole-archive -lstdc++ -Wl,--no-whole-archive`?

I have tried it (with emsdk `v3.1.74`) but at runtime I was getting crashes related to missing symbols (I manually added some of them to EXPORTED_FUNCTIONS in the MAIN_MODULE to see if that makes it run further, which it did).