cmd/go: fix invalid go pack command line in the output of go build -x

Fixes #7262

LGTM=iant
R=golang-codereviews, iant
CC=golang-codereviews
https://golang.org/cl/76110043

diff --git a/src/cmd/go/build.go b/src/cmd/go/build.go
index f653b5272725403b712b59227619226ee5d7a547..182ffb2d2eb10afa998b8677277634966df02a9d 100644 (file)
--- a/src/cmd/go/build.go
+++ b/src/cmd/go/build.go
@@ -1625,10 +1625,10 @@ func (gcToolchain) pack(b *builder, p *Package, objDir, afile string, ofiles []s
        appending := false
        if _, err := os.Stat(absAfile); err == nil {
                appending = true
-               cmd = "rqP"
+               cmd = "r"
        }
 
-       cmdline := stringList("pack", cmd, b.work, absAfile, absOfiles)
+       cmdline := stringList("pack", cmd, absAfile, absOfiles)
 
        if appending {
                if buildN || buildX {