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cmd/cgo: mishandles 40 bit bitfield #22958

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ianlancetaylor opened this issue Dec 1, 2017 · 2 comments
Closed

cmd/cgo: mishandles 40 bit bitfield #22958

ianlancetaylor opened this issue Dec 1, 2017 · 2 comments
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FrozenDueToAge release-blocker
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Go1.11

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@ianlancetaylor
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Building this test case with go build foo.go

package p

/*
typedef struct {
	unsigned long x : 40;
} s;
*/
import "C"

var v C.s

produces

# command-line-arguments
/tmp/go-build300185653/b001/_cgo_gotypes.go:23:4: undefined: uint40

Oddly, something seems to be special about the number 40.
@ianlancetaylor ianlancetaylor added this to the Go1.11 milestone Dec 1, 2017
@ianlancetaylor
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Ah, it fails when the bit size is a multiple of 8 other than 8, 16, 32, 64.

@gopherbot
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Change https://golang.org/cl/81435 mentions this issue: cmd/cgo: for C bitfields use only valid Go integer types

@golang golang locked and limited conversation to collaborators Dec 1, 2018
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