internal/clite:wrap with cpp

runtime/internal/clite/os/_os/os.c

@@ -1,14 +0,0 @@
-#include <stdlib.h>
-#include <errno.h>
-
-int cliteClearenv()
-{
-	extern char **environ;
-	if (environ != NULL)
-	{
-		*environ = NULL;
-	}
-	return 0;
-}
-
-int cliteErrno() { return errno; }

runtime/internal/clite/os/_os/os.cpp

@@ -0,0 +1,15 @@
+#include <errno.h>
+#include <stdlib.h>
+
+extern "C" {
+
+int cliteClearenv() {
+    extern char **environ;
+    if (environ != NULL) {
+        *environ = NULL;
+    }
+    return 0;
+}
+
+int cliteErrno() { return errno; }
+}

runtime/internal/clite/os/os_darwin.go

@@ -23,7 +23,7 @@ import (
 )
 
 const (
-	LLGoFiles   = "_os/os.c"
+	LLGoFiles   = "_os/os.cpp"
 	LLGoPackage = "link"
 )