Squashed 'shared/c-rbtree/' changes from bd1c14dc0d93..3162c5c04574

3162c5c04574 build: synchronize AUTHORS
c795b7657f4f c-rbtree: align CRBTree with CRBNode
10d973a9e671 c-rbtree: fix struct alignment of CRBTree on m68k architectures

git-subtree-dir: shared/c-rbtree
git-subtree-split: 3162c5c04574789144aff9de55c423cc8b636c85

2 files changed, 13 insertions, 2 deletions

diff --git a/AUTHORS b/AUTHORS
index b59660c5ee..ed4e72e915 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -34,4 +34,6 @@ COPYRIGHT: (ordered alphabetically)
 
 AUTHORS: (ordered alphabetically)
         David Rheinsberg <david.rheinsberg@gmail.com>
+        Kay Sievers <kay@vrfy.org>
+        Thomas Haller <thaller@redhat.com>
         Tom Gundersen <teg@jklm.no>
diff --git a/src/c-rbtree.h b/src/c-rbtree.h
index a9bbce52f2..d4d0fe45c0 100644
--- a/src/c-rbtree.h
+++ b/src/c-rbtree.h
@@ -27,6 +27,7 @@ extern "C" {
 #endif
 
 #include <assert.h>
+#include <stdalign.h>
 #include <stddef.h>
 
 typedef struct CRBNode CRBNode;
@@ -58,7 +59,11 @@ typedef struct CRBTree CRBTree;
  * C_RBNODE_INIT.
  */
 struct CRBNode {
-        unsigned long __parent_and_flags;
+        union {
+                unsigned long __parent_and_flags;
+                /* enforce >=4-byte alignment for @__parent_and_flags */
+                alignas(4) unsigned char __align_dummy;
+        };
         CRBNode *left;
         CRBNode *right;
 };
@@ -88,7 +93,11 @@ void c_rbnode_unlink_stale(CRBNode *n);
  * To initialize an RB-Tree, set it to NULL / all zero.
  */
 struct CRBTree {
-        CRBNode *root;
+        union {
+                CRBNode *root;
+                /* enforce >=4-byte alignment for @root */
+                alignas(4) unsigned char __align_dummy;
+        };
 };
 
 #define C_RBTREE_INIT {}