cgo warning: built-in function ‘free’ declared as non-function about sqlite HOT 3 CLOSED

It appears this warning may be safely ignored, but I would still like to better understand its root cause.

from sqlite.

This is also discussed here: golang/go#32411

I suspect that it comes from this line:

C.sqlite3_result_text(ctx.ptr, cv, C.int(len(v)), (*[0]byte)(C.free))

in

func (ctx Context) ResultText(v string) {
	var cv *C.char
	if len(v) != 0 {
		cv = C.CString(v)
	}
	C.sqlite3_result_text(ctx.ptr, cv, C.int(len(v)), (*[0]byte)(C.free))
}

and this line:

free = (*[0]byte)(C.free)

in

func (stmt *Stmt) BindText(param int, value string) {
	var v *C.char
	var free *[0]byte
	if len(value) == 0 {
		v = emptyCstr
	} else {
		v = C.CString(value)
		free = (*[0]byte)(C.free)
	}
	res := C.sqlite3_bind_text(stmt.stmt, C.int(param), v, C.int(len(value)), free)
	stmt.handleBindErr("BindText", res)
}

It is harmless, but it is also annoying. I'd also like to see it go away.

from sqlite.

One possible workaround is to define a C function that calls free, and then pass that C function instead of free to the sqlite calls as needed.

from sqlite.