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cmd/cgo: -godefs mishandles enum value #39534

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ianlancetaylor opened this issue Jun 11, 2020 · 4 comments
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cmd/cgo: -godefs mishandles enum value #39534

ianlancetaylor opened this issue Jun 11, 2020 · 4 comments
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FrozenDueToAge NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. release-blocker
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Go1.15

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@ianlancetaylor
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Reduced test case:

package p

// enum { IFF_UP = 0x1 };
import "C"

const IFF_UP = C.IFF_UP

Running go tool cgo -godefs x.go with Go 1.14 produces

const IFF_UP = 0x1

With tip it produces

const IFF_UP = int32

Although -godefs is not seriously supported, we shouldn't break it like this.

This may be due to https://golang.org/cl/230037. CC @mdempsky
@ianlancetaylor ianlancetaylor added NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. release-blocker labels Jun 11, 2020
@ianlancetaylor ianlancetaylor added this to the Go1.15 milestone Jun 11, 2020
@mdempsky
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I can look into it, unless you're already doing that.

@ianlancetaylor
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I'm looking at it. I have a fix.

@gopherbot
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Change https://golang.org/cl/237558 mentions this issue: cmd/cgo: in -godefs mode, don't change constant to type

@tklauser
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Thanks a lot for fixing this @ianlancetaylor. Just noticed the same behavior while trying to re-generate x/sys/unix with go1.15beta1.

@ianlancetaylor ianlancetaylor mentioned this issue Jul 9, 2020
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