If cross compiling to Linux (whether 32-bit, or 64-bit), it is as easy as running Docker. Not sure about macOS running docker with WINE.
Cross platform compiler seems to be rare; but there are multiple ones in Golang (which supports compiling
cgo), as well as one in Node.js (which doesn't support compiling
But what about others, like Python, Rust or Crystal?
BTW, is it worth supporting 32-bit in the first place?