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cmd/cgo: uint64_t used to permit C.ulong, but no longer does #31093

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ianlancetaylor opened this Issue Mar 27, 2019 · 0 comments

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commented Mar 27, 2019

This program works fine with Go 1.12.

package main

// #include <stdint.h>
// static uint64_t foo(uint64_t v) { return v; }
import "C"

import "fmt"

func main() {
	i := 0
	j := C.foo(C.ulong(i))
	fmt.Printf("%T %d\n", j, j)
}

With current tip, it fails to build with

# command-line-arguments
foo.go:11:20: cannot use _Ctype_ulong(i) (type _Ctype_ulong) as type uint64 in argument to _Cfunc_foo

This is a consequence of the change for #29878. We need to address it one way or another.

CC @phst

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