From d9e2ba4fcce0a405e2d103e43c19f01fa1a5401d Mon Sep 17 00:00:00 2001
From: Ian Lance Taylor <iant@golang.org>
Date: Wed, 19 Dec 2018 07:03:04 -0800
Subject: cmd/cgo: ensure the command passed to run retains a trailing dash

This was accidentally broken by CL 127755.

Fixes #29333

Change-Id: I5e92048c64a55c1699d6c38eb4dbbd51c817b820
Reviewed-on: https://go-review.googlesource.com/c/155037
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
---
 src/cmd/cgo/gcc.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/cmd/cgo/gcc.go b/src/cmd/cgo/gcc.go
index 27bd59b54e..11c3ff3a9c 100644
--- a/src/cmd/cgo/gcc.go
+++ b/src/cmd/cgo/gcc.go
@@ -1992,8 +1992,10 @@ func (p *Package) gccErrors(stdin []byte) string {
 		}
 	}
 
-	// Force -O0 optimization
+	// Force -O0 optimization but keep the trailing "-" at the end.
 	nargs = append(nargs, "-O0")
+	nl := len(nargs)
+	nargs[nl-2], nargs[nl-1] = nargs[nl-1], nargs[nl-2]
 
 	if *debugGcc {
 		fmt.Fprintf(os.Stderr, "$ %s <<EOF\n", strings.Join(nargs, " "))
-- 
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