misc/cgo/test: add cgo build constraints

We're about to move this package to cmd/cgo/internal, where it will
get caught up in the "CGO_ENABLED=0 go install cmd" done by make.bash.
Currently, building this package with CGO_ENABLED=0 fails because it
contains several source files that don't themselves import "C", but do
import a subdirectory where that package imports "C" and thus has no
exported API.

Fix the CGO_ENABLED=0 build of this package by adding the necessary
cgo build tags. Not all source files need it, but this CL makes
"CGO_ENABLED=0 go test -c" work in this package.

For #37486.

Change-Id: Id137cdfbdd950eea802413536d990ab642ebcd7e
Reviewed-on: https://go-review.googlesource.com/c/go/+/493215
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Run-TryBot: Austin Clements <austin@google.com>

20 files changed, 39 insertions, 7 deletions

diff --git a/misc/cgo/test/cgo_linux_test.go b/misc/cgo/test/cgo_linux_test.go
index 3a1cf98c2a..3defc32ffd 100644
--- a/misc/cgo/test/cgo_linux_test.go
+++ b/misc/cgo/test/cgo_linux_test.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build cgo
+
 package cgotest
 
 import (
diff --git a/misc/cgo/test/cgo_test.go b/misc/cgo/test/cgo_test.go
index 5b298954f5..5a07c4c0fa 100644
--- a/misc/cgo/test/cgo_test.go
+++ b/misc/cgo/test/cgo_test.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build cgo
+
 package cgotest
 
 import "testing"
diff --git a/misc/cgo/test/cgo_unix_test.go b/misc/cgo/test/cgo_unix_test.go
index e6d6ee54b4..5c1f9b7e40 100644
--- a/misc/cgo/test/cgo_unix_test.go
+++ b/misc/cgo/test/cgo_unix_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 !windows
+//go:build cgo && !windows
 
 package cgotest
 
diff --git a/misc/cgo/test/gcc68255.go b/misc/cgo/test/gcc68255.go
index 7b25e02ad8..954bba9b5c 100644
--- a/misc/cgo/test/gcc68255.go
+++ b/misc/cgo/test/gcc68255.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build cgo
+
 package cgotest
 
 import (
diff --git a/misc/cgo/test/issue18146.go b/misc/cgo/test/issue18146.go
index f02fc4476d..d302bd029f 100644
--- a/misc/cgo/test/issue18146.go
+++ b/misc/cgo/test/issue18146.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 !windows
+//go:build cgo && !windows
 
 // Issue 18146: pthread_create failure during syscall.Exec.
 
diff --git a/misc/cgo/test/issue23555.go b/misc/cgo/test/issue23555.go
index e84c23cfd4..299fdcb914 100644
--- a/misc/cgo/test/issue23555.go
+++ b/misc/cgo/test/issue23555.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build cgo
+
 // Test that we can have two identical cgo packages in a single binary.
 // No runtime test; just make sure it compiles.
 
diff --git a/misc/cgo/test/issue24161_darwin_test.go b/misc/cgo/test/issue24161_darwin_test.go
index 7bb2af69a5..9054d6205c 100644
--- a/misc/cgo/test/issue24161_darwin_test.go
+++ b/misc/cgo/test/issue24161_darwin_test.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build cgo
+
 package cgotest
 
 import (
diff --git a/misc/cgo/test/issue26430.go b/misc/cgo/test/issue26430.go
index b55193973d..cf276a0362 100644
--- a/misc/cgo/test/issue26430.go
+++ b/misc/cgo/test/issue26430.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build cgo
+
 // Issue 26430: incomplete typedef leads to inconsistent typedefs error.
 // No runtime test; just make sure it compiles.
 
diff --git a/misc/cgo/test/issue26743.go b/misc/cgo/test/issue26743.go
index 716f2e48d9..903caeeada 100644
--- a/misc/cgo/test/issue26743.go
+++ b/misc/cgo/test/issue26743.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build cgo
+
 // Issue 26743: typedef of uint leads to inconsistent typedefs error.
 // No runtime test; just make sure it compiles.
 
diff --git a/misc/cgo/test/issue27340.go b/misc/cgo/test/issue27340.go
index 2c51088363..d70f104179 100644
--- a/misc/cgo/test/issue27340.go
+++ b/misc/cgo/test/issue27340.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build cgo
+
 // Failed to resolve typedefs consistently.
 // No runtime test; just make sure it compiles.
 
diff --git a/misc/cgo/test/issue29563.go b/misc/cgo/test/issue29563.go
index bbe98bbd48..800b5461af 100644
--- a/misc/cgo/test/issue29563.go
+++ b/misc/cgo/test/issue29563.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 !windows
+//go:build cgo && !windows
 
 // Issue 29563: internal linker fails on duplicate weak symbols.
 // No runtime test; just make sure it compiles.
diff --git a/misc/cgo/test/issue30527.go b/misc/cgo/test/issue30527.go
index e0e18bebdf..982455084d 100644
--- a/misc/cgo/test/issue30527.go
+++ b/misc/cgo/test/issue30527.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build cgo
+
 // Issue 30527: function call rewriting casts untyped
 // constants to int because of ":=" usage.
 
diff --git a/misc/cgo/test/issue43639.go b/misc/cgo/test/issue43639.go
index 41e1471059..38dae41d5e 100644
--- a/misc/cgo/test/issue43639.go
+++ b/misc/cgo/test/issue43639.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build cgo
+
 package cgotest
 
 // Issue 43639: No runtime test needed, make sure package misc/cgo/test/issue43639 compiles well.
diff --git a/misc/cgo/test/issue52611.go b/misc/cgo/test/issue52611.go
index 2b59d521f7..a190a10884 100644
--- a/misc/cgo/test/issue52611.go
+++ b/misc/cgo/test/issue52611.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build cgo
+
 // Issue 52611: inconsistent compiler behaviour when compiling a C.struct.
 // No runtime test; just make sure it compiles.
 
diff --git a/misc/cgo/test/issue8828.go b/misc/cgo/test/issue8828.go
index 3b5765d306..e9ec265268 100644
--- a/misc/cgo/test/issue8828.go
+++ b/misc/cgo/test/issue8828.go
@@ -1,9 +1,9 @@
-// compile
-
 // Copyright 2014 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build cgo
+
 // Issue 8828: compiling a file with -compiler=gccgo fails if a .c file
 // has the same name as compiled directory.
 
diff --git a/misc/cgo/test/issue9026.go b/misc/cgo/test/issue9026.go
index a30196c99f..fc4df07a3b 100644
--- a/misc/cgo/test/issue9026.go
+++ b/misc/cgo/test/issue9026.go
@@ -1,3 +1,9 @@
+// Copyright 2023 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build cgo
+
 package cgotest
 
 import (
diff --git a/misc/cgo/test/issue9400/stubs.go b/misc/cgo/test/issue9400/stubs.go
index 08cde2e33b..c2b235abab 100644
--- a/misc/cgo/test/issue9400/stubs.go
+++ b/misc/cgo/test/issue9400/stubs.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 gc
+//go:build linux && gc
 
 package issue9400
 
diff --git a/misc/cgo/test/issue9510.go b/misc/cgo/test/issue9510.go
index 325b0cfb4a..9bccfeb5e7 100644
--- a/misc/cgo/test/issue9510.go
+++ b/misc/cgo/test/issue9510.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build cgo
+
 // Test that we can link together two different cgo packages that both
 // use the same libgcc function.
 
diff --git a/misc/cgo/test/test26213.go b/misc/cgo/test/test26213.go
index f8149cd7c8..3669590f47 100644
--- a/misc/cgo/test/test26213.go
+++ b/misc/cgo/test/test26213.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build cgo
+
 package cgotest
 
 import (
diff --git a/misc/cgo/test/test_unix.go b/misc/cgo/test/test_unix.go
index 50fb0d4db2..664c4850d3 100644
--- a/misc/cgo/test/test_unix.go
+++ b/misc/cgo/test/test_unix.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 !windows
+//go:build unix
 
 package cgotest