Arch Linux

Description:
The "-i" flag of "go build" causes builds to fail with "permission denied" errors for files in /usr/lib/go/pkg/...
Building without the -i flag works fine.

$ cat main.go
package main
import "fmt"
func main() {
fmt.Println("Hello World")
}

$ go build -v -i
errors
internal/race
unicode/utf8
math/bits
runtime/internal/sys
sync/atomic
unicode
runtime/internal/atomic
internal/cpu
go build internal/race: open /usr/lib/go/pkg/linux_amd64/internal/race.a: permission denied
go build errors: open /usr/lib/go/pkg/linux_amd64/errors.a: permission denied
go build runtime/internal/sys: open /usr/lib/go/pkg/linux_amd64/runtime/internal/sys.a: permission denied
go build unicode/utf8: open /usr/lib/go/pkg/linux_amd64/unicode/utf8.a: permission denied
go build sync/atomic: open /usr/lib/go/pkg/linux_amd64/sync/atomic.a: permission denied
go build math/bits: open /usr/lib/go/pkg/linux_amd64/math/bits.a: permission denied
go build runtime/internal/atomic: open /usr/lib/go/pkg/linux_amd64/runtime/internal/atomic.a: permission denied
go build internal/cpu: open /usr/lib/go/pkg/linux_amd64/internal/cpu.a: permission denied
go build unicode: open /usr/lib/go/pkg/linux_amd64/unicode.a: permission denied

$ go clean
$ go clean -cache
$ go list -f '{{.Stale}}' errors
true
$ go list -f '{{.StaleReason}}' errors
build ID mismatch


Additional info:
* go and go-pie version 2:1.11.5-1 have this bug, 1.11.4 does not
* the prebuilt go1.11.5.linux-amd64.tar.gz from https://golang.org/dl does not show this bug
* version 1.11.5 added 'export GO_GCFLAGS="-trimpath=$GOPATH"' to the PKGBUILD. If I remove
this line, some of the gdb tests in check() fail. If I build anyway with --nocheck, the resulting
package works and doesn't have this bug.

Steps to reproduce: compile any go program with the "-i" flag.