Cannot define fd_write in an imported package

[fgsch]

Due to constraints in my environment, fd_write needs to be imported from wasi_snapshot_preview1.
This is possible if it is defined in the main package, for example using the following:

//go:wasm-module wasi_snapshot_preview1
//export fd_write
func placeholder() int32

or, using a similar signature:

//go:wasm-module wasi_snapshot_preview1
//export fd_write
func fd_write(int32, *int32, int32, *int32) int32

But using either of these approaches in an imported package fails with:

Attribute after last parameter!
i32 ()* @fd_write
Incorrect number of arguments passed to called function!
  %3 = call i32 @fd_write(i32 1, %runtime.__wasi_iovec_t* @runtime.putcharIOVec, i32 1, i32* @runtime.putcharNWritten)
error: verification error after IR construction

or:

Call parameter type does not match function signature!
%runtime.__wasi_iovec_t* @runtime.putcharIOVec
 i32*  %3 = call i32 @fd_write(i32 1, %runtime.__wasi_iovec_t* @runtime.putcharIOVec, i32 1, i32* @runtime.putcharNWritten)
error: verification error after IR construction

respectively.
I'm not sure if there is a way to match the signature as runtime.__wasi_iovec_t is not exported.

Tinygo version:

tinygo version 0.16.0 darwin/amd64 (using go version go1.15.8 and LLVM version 10.0.1)

[fgsch]

Related to #1647.

[aykevl]

It seems to me that the correct solution is #1647, which should be straightforward to fix.

[fgsch]

@aykevl Agreed. Let's close this one.