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cmd/vet: -<analyzer> flags don't work when outside of GOROOT #35837

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@shawndx

Description

@shawndx

What version of Go are you using (go version)?

$ go version
go version devel +95be9b7559 Fri Nov 22 04:26:34 2019 +0000 linux/amd64

Does this issue reproduce with the latest release?

Yes

What operating system and processor architecture are you using (go env)?

go env Output
$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/xiaji01/.cache/go-build"
GOENV="/home/xiaji01/.config/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/xiaji01/.go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/home/xiaji01/util/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/home/xiaji01/util/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build905003963=/tmp/go-build -gno-record-gcc-switches"

What did you do?

~/util/go$ go vet runtime/testdata/testprog
# runtime/testdata/testprog
src/runtime/testdata/testprog/deadlock.go:45:2: unreachable code
src/runtime/testdata/testprog/deadlock.go:50:2: unreachable code

~/util/go$ go vet -unreachable=false runtime/testdata/testprog
# runtime/testdata/testprog
src/runtime/testdata/testprog/deadlock.go:45:2: unreachable code
src/runtime/testdata/testprog/deadlock.go:50:2: unreachable code

What did you expect to see?

-unreachable=false works even running 'go vet' outside <go root>/src

What did you see instead?

the unreachable warning is not suppressed.

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