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cmd/vet: build tag checks running in vetxonly mode #26102

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rsc opened this issue Jun 28, 2018 · 2 comments
Closed

cmd/vet: build tag checks running in vetxonly mode #26102

rsc opened this issue Jun 28, 2018 · 2 comments
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FrozenDueToAge release-blocker
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Go1.11

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@rsc
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rsc commented Jun 28, 2018

When we "go test" t1, and t1 imports t2, we run vet in vetx-only mode on t2 to compute any vet-specific export data. That vetx-only run is not supposed to report problems with t2. But it is:

$ cd $GOPATH/src/t1
$ ls
t1_test.go
$ cat t1_test.go
package t1

import _ "t2"
$ ls ../t2
t2x.go	t2y.go
$ cat ../t2/t2x.go
package t2
$ cat ../t2/t2y.go
// +build !foo-bar

package t2
$ go1.10 test
testing: warning: no tests to run
PASS
ok  	t1	0.013s
$ go test
# t2
../t2/t2y.go:1: invalid non-alphanumeric build constraint: [!foo-bar]
testing: warning: no tests to run
PASS
ok  	t1	0.012s
$ go test
testing: warning: no tests to run
PASS
ok  	t1	0.012s
$ go test -a
# t2
../t2/t2y.go:1: invalid non-alphanumeric build constraint: [!foo-bar]
testing: warning: no tests to run
PASS
ok  	t1	0.012s
$
@rsc rsc added this to the Go1.11 milestone Jun 28, 2018
@gopherbot
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Change https://golang.org/cl/121395 mentions this issue: cmd/vet: don't run buildtag check when in vetxonly mode

@mvdan
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mvdan commented Jun 28, 2018

I had worked on the buildtag check recently, so the fix was easy to find. Sent a CL above.

@bcmills bcmills mentioned this issue Jun 28, 2018
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@rsc @mvdan @gopherbot