crypto/rand, internal/syscall/unix: don't use getentropy on iOS
CL 302489 switched crypto/rand to use getentropy on darwin, however this
function is not available on iOS. Enable getentropy only on macOS and
disable it on iOS.
Fixes #47812
Change-Id: Ib7ba5d77346aee87904bb93d60cacc845f5c0089
Reviewed-on: https://go-review.googlesource.com/c/go/+/343609
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
diff --git a/src/crypto/rand/rand_getentropy.go b/src/crypto/rand/rand_getentropy.go
index f82018a..dd72537 100644
--- a/src/crypto/rand/rand_getentropy.go
+++ b/src/crypto/rand/rand_getentropy.go
@@ -2,8 +2,8 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
-//go:build darwin || openbsd
-// +build darwin openbsd
+//go:build (darwin && !ios) || openbsd
+// +build darwin,!ios openbsd
package rand
diff --git a/src/internal/syscall/unix/getentropy_darwin.go b/src/internal/syscall/unix/getentropy_darwin.go
index e1a410a..c75006b 100644
--- a/src/internal/syscall/unix/getentropy_darwin.go
+++ b/src/internal/syscall/unix/getentropy_darwin.go
@@ -2,6 +2,9 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
+//go:build darwin && !ios
+// +build darwin,!ios
+
package unix
import (
