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cmd/cgo: missing field in packed struct #8373

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gopherbot opened this issue Jul 15, 2014 · 1 comment
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cmd/cgo: missing field in packed struct #8373

gopherbot opened this issue Jul 15, 2014 · 1 comment
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@gopherbot
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by Jonathan.Plona:

What does 'go version' print?
go version go1.3 linux/amd64

What steps reproduce the problem?

1.  Create a C struct with two fields, a uint32_t and a uint64_t, and
__attribute__((packed)).
2.  Try to access the second field.

What happened?
The second field is not detected:

./bug.go:14: bug.b undefined (type C.struct_bug has no field or method b)

What should have happened instead?

The second field is detected and can be used.

Please provide any additional information below.

Go 1.2.2 builds the code without problem

Attachments:

  1. bug.go (190 bytes)
@minux
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minux commented Jul 15, 2014

Comment 1:

the second field is mis-aligned according to Go's rule of field
alignment, so it's impossible for Go to access the 2nd field.
This is actually a bug of previous Go version.

Status changed to WorkingAsIntended.

@golang golang locked and limited conversation to collaborators Jun 25, 2016
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@minux @gopherbot