src/cmd/go/testdata/script/goflags.txt

env GO111MODULE=off

# GOFLAGS sets flags for commands

env GOFLAGS='-e -f={{.Dir}} --test.benchtime=1s -count=10'
go list asdfasdfasdf  # succeeds because of -e
go list runtime
stdout '[\\/]runtime$'

env GOFLAGS=-race OLDGOARCH=$GOARCH OLDGOOS=$GOOS GOARCH=386 GOOS=linux
! go list runtime
stderr 'race is only supported on'

env GOARCH=$OLDGOARCH GOOS=$OLDGOOS

# go env succeeds even though -f={{.Dir}} is inappropriate
go env

# bad flags are diagnosed
env GOFLAGS=-typoflag
! go list runtime
stderr 'unknown flag -typoflag'

env GOFLAGS=-
! go list runtime
stderr '^go: parsing \$GOFLAGS: non-flag "-"'

env GOFLAGS=--
! go list runtime
stderr '^go: parsing \$GOFLAGS: non-flag "--"'

env GOFLAGS=---oops
! go list runtime
stderr '^go: parsing \$GOFLAGS: non-flag "---oops"'

env GOFLAGS=-=noname
! go list runtime
stderr '^go: parsing \$GOFLAGS: non-flag "-=noname"'

env GOFLAGS=-f
! go list runtime
stderr '^go: flag needs an argument: -f \(from (\$GOFLAGS|%GOFLAGS%)\)$'

env GOFLAGS=-e=asdf
! go list runtime
stderr '^go: invalid boolean value \"asdf\" for flag -e \(from (\$GOFLAGS|%GOFLAGS%)\)'

# except in go bug (untested) and go env
go env
stdout GOFLAGS

# Flags listed in GOFLAGS should be safe to duplicate on the command line.
env GOFLAGS=-tags=magic
go list -tags=magic
go test -tags=magic -c -o $devnull
go vet -tags=magic

-- foo_test.go --
package foo