runtime: break out system-specific constants into package sys

runtime/internal/sys will hold system-, architecture- and config-
specific constants.

Updates #11647

Change-Id: I6db29c312556087a42e8d2bdd9af40d157c56b54
Reviewed-on: https://go-review.googlesource.com/16817
Reviewed-by: Russ Cox <rsc@golang.org>

1 files changed, 6 insertions, 4 deletions

diff --git a/src/runtime/extern.go b/src/runtime/extern.go
index 5a5d432f62..564318c7cd 100644
--- a/src/runtime/extern.go
+++ b/src/runtime/extern.go
@@ -130,6 +130,8 @@ of the run-time system.
 */
 package runtime
 
+import "runtime/internal/sys"
+
 // Caller reports file and line number information about function invocations on
 // the calling goroutine's stack.  The argument skip is the number of stack frames
 // to ascend, with 0 identifying the caller of Caller.  (For historical reasons the
@@ -199,20 +201,20 @@ func GOROOT() string {
 	if s != "" {
 		return s
 	}
-	return defaultGoroot
+	return sys.DefaultGoroot
 }
 
 // Version returns the Go tree's version string.
 // It is either the commit hash and date at the time of the build or,
 // when possible, a release tag like "go1.3".
 func Version() string {
-	return theVersion
+	return sys.TheVersion
 }
 
 // GOOS is the running program's operating system target:
 // one of darwin, freebsd, linux, and so on.
-const GOOS string = theGoos
+const GOOS string = sys.TheGoos
 
 // GOARCH is the running program's architecture target:
 // 386, amd64, or arm.
-const GOARCH string = theGoarch
+const GOARCH string = sys.TheGoarch