* stor-layout.c (place_union_field): For bitfields if

	PCC_BITFIELD_TYPE_MATTERS and TYPE_USER_ALIGN, set record's
	TYPE_USER_ALIGN.

	* gcc.dg/bitfld-3.c: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@56112 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 67 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/bitfld-3.c b/gcc/testsuite/gcc.dg/bitfld-3.c
new file mode 100644
index 00000000000..3843acb6e39
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/bitfld-3.c
@@ -0,0 +1,67 @@
+/* Test for bitfield alignment in structs and unions.  */
+/* { dg-do run }  */
+/* { dg-options "-O2" }  */
+
+extern void abort (void);
+extern void exit (int);
+
+typedef long la __attribute__((aligned (8)));
+
+struct A
+{
+  char a;
+  union UA
+  {
+    char x;
+    la y : 6;
+  } b;
+  char c;
+} a;
+
+struct B
+{
+  char a;
+  union UB
+  {
+    char x;
+    long y : 6 __attribute__((aligned (8)));
+  } b;
+  char c;
+} b;
+
+struct C
+{
+  char a;
+  struct UC
+  {
+    la y : 6;
+  } b;
+  char c;
+} c;
+
+struct D
+{
+  char a;
+  struct UD
+  {
+    long y : 6 __attribute__((aligned (8)));
+  } b;
+  char c;
+} d;
+
+int main (void)
+{
+  if (sizeof (a) != sizeof (b))
+    abort ();
+  if (sizeof (a) != sizeof (c))
+    abort ();
+  if (sizeof (a) != sizeof (d))
+    abort ();
+  if ((&a.c - &a.a) != (&b.c - &b.a))
+    abort ();
+  if ((&a.c - &a.a) != (&c.c - &c.a))
+    abort ();
+  if ((&a.c - &a.a) != (&d.c - &d.a))
+    abort ();
+  exit (0);
+}