cmd/go: document c-shared buildmode for building WASI library/reactor

For #65199. Change-Id: Icd3ec7cf25c2d381401686333c8aeed8013b3fbd Reviewed-on: https://go-review.googlesource.com/c/go/+/633418 Reviewed-by: Michael Matloob <[email protected]> LUCI-TryBot-Result: Go LUCI <[email protected]>
golang · Dec 7, 2024 · 04cdaa9 · 04cdaa9
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diff --git a/src/cmd/go/alldocs.go b/src/cmd/go/alldocs.go
diff --git a/src/cmd/go/internal/help/helpdoc.go b/src/cmd/go/internal/help/helpdoc.go
@@ -769,7 +769,10 @@ are:
 		Build the listed main package, plus all packages it imports,
 		into a C shared library. The only callable symbols will
 		be those functions exported using a cgo //export comment.
-		Requires exactly one main package to be listed.
+		On wasip1, this mode builds it to a WASI reactor/library,
+		of which the callable symbols are those functions exported
+		using a //go:wasmexport directive. Requires exactly one
+		main package to be listed.
 
 	-buildmode=default
 		Listed main packages are built into executables and listed