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go/misc/cgo/testgodefs/anonunion.go
Ian Lance Taylor f2f17c0ff2 cmd/cgo: for -godefs, promote first field of anonymous union
Update #6677

When a struct contains an anonymous union, use the type and
name of the first field in the union.

This should make the glibc <sys/resource.h> file work; in that
file struct rusage has fields like

__extension__ union
{
        long int ru_maxrss;
        __syscall_slong_t __ru_maxrss_word;
};

in which the field that matters is ru_maxrss and
__ru_maxrss_word just exists to advance to the next field on
systems where the kernel uses long long fields but userspace
expects long fields.

LGTM=mikioh.mikioh
R=golang-codereviews, mikioh.mikioh
CC=golang-codereviews
https://golang.org/cl/106260044
2014-08-05 17:10:15 -07:00

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517 B
Go

// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//
// +build ignore
package main
// This file tests that when cgo -godefs sees a struct with a field
// that is an anonymous union, the first field in the union is
// promoted to become a field of the struct. See issue 6677 for
// background.
/*
typedef struct {
union {
long l;
int c;
};
} t;
*/
import "C"
// Input for cgo -godefs.
type T C.t