cmd/go: enable fuzz testing on OpenBSD

This change provides support for -fuzz flag on OpenBSD. According to #46554 the flag was unsupported on some OSes due to lack of proper testing.

Fixes: #60491

Change-Id: I49835131d3ee23f6482583b518b9c5c224fc4efe
GitHub-Last-Rev: f697a3c
GitHub-Pull-Request: #60520
Reviewed-on: https://go-review.googlesource.com/c/go/+/499335
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: David Chase <[email protected]>
Reviewed-by: qiu laidongfeng2 <[email protected]>
Reviewed-by: Bryan Mills <[email protected]>
Reviewed-by: Ian Lance Taylor <[email protected]>
Auto-Submit: Ian Lance Taylor <[email protected]>

Author: macie

src/internal/fuzz/counters_supported.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build (darwin || linux || windows || freebsd) && (amd64 || arm64)
+//go:build (darwin || linux || windows || freebsd || openbsd) && (amd64 || arm64)
 
 package fuzz
 

src/internal/fuzz/counters_unsupported.go

@@ -8,7 +8,7 @@
 //
 // If you update this constraint, also update internal/platform.FuzzInstrumented.
 //
-//go:build !((darwin || linux || windows || freebsd) && (amd64 || arm64))
+//go:build !((darwin || linux || windows || freebsd || openbsd) && (amd64 || arm64))
 
 package fuzz
 

src/internal/fuzz/minimize_test.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build darwin || freebsd || linux || windows
+//go:build darwin || freebsd || linux || openbsd || windows
 
 package fuzz
 

src/internal/fuzz/sys_posix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build darwin || freebsd || linux
+//go:build darwin || freebsd || linux || openbsd
 
 package fuzz
 

src/internal/fuzz/sys_unimplemented.go

@@ -4,7 +4,7 @@
 
 // If you update this constraint, also update internal/platform.FuzzSupported.
 //
-//go:build !darwin && !freebsd && !linux && !windows
+//go:build !darwin && !freebsd && !linux && !openbsd && !windows
 
 package fuzz
 

src/internal/platform/supported.go

@@ -61,7 +61,7 @@ func ASanSupported(goos, goarch string) bool {
 // ('go test -fuzz=.').
 func FuzzSupported(goos, goarch string) bool {
 	switch goos {
-	case "darwin", "freebsd", "linux", "windows":
+	case "darwin", "freebsd", "linux", "openbsd", "windows":
 		return true
 	default:
 		return false