Before filing a bug, please check whether it has been fixed since
the latest release: run "hg pull -u" and retry what you did to
reproduce the problem.  Thanks.

What steps will reproduce the problem?
1. Download the attached source file.
2. Run the command "cgo bitfield.go"

What is the expected output? What do you see instead?
I expect no output because the command will be successful. I got:

struct size calculation error

What is your $GOOS?  $GOARCH?
$GOOS = linux
$GOARCH = amd64

Which revision are you sync'ed to?  (hg log -l 1)
changeset:   4034:91b34a55c1a4
tag:         tip
user:        Rob Pike <r@golang.org>
date:        Fri Nov 13 16:00:55 2009 -0800
summary:     fix typo

Please provide any additional information below.
Digging into the cgo code a little, it looks like the problem's in gcc.go
in Struct(). off == 20, but dt.ByteSize == 4, but because they're not equal
the error is printed. 4 is the correct size.

Attachments:

1. bitfield.go (246 bytes)