Wasm Support

[kateinoigakukun (Yuta Saito)]

@Joe_Groff

@Joe_Groff

You might be able to fend off these unnecessary GOT entries in the short term by marking all symbols as dsolocal in the generated LLVM IR, and changing the logic in Swift IRGen's getAddrOfLLVMVariableOrGOTEquivalent to always generate direct references when targeting WASM.

Thanks for your detailed description! I'll try to eliminate GOT related global variables.
I simply changed the linkage flag and it seems produced object files are linked well :)

@Joe_Groff

To me, it seems more natural to change the LLVM calling convention lowering for swiftcc functions.

OK, I'll take a look around SwiftCallingConv.cpp. Thanks!

BTW do you know who is a right person to review around build-script? I offered @compnerd to review bootstrapping PR, but it seems he is too busy to take a look.