re PR c/63495 (struct __attribute__ ((aligned (8))) broken on x86)

	PR c/63495
	* stor-layout.c (min_align_of_type): Don't decrease alignment
	through BIGGEST_FIELD_ALIGNMENT or ADJUST_FIELD_ALIGN if
	TYPE_USER_ALIGN is set.

	* gcc.target/i386/pr63495.c: New test.

From-SVN: r216101

gcc/ChangeLog

+2014-10-10  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c/63495
+	* stor-layout.c (min_align_of_type): Don't decrease alignment
+	through BIGGEST_FIELD_ALIGNMENT or ADJUST_FIELD_ALIGN if
+	TYPE_USER_ALIGN is set.
+
 2014-10-10  Uros Bizjak  <ubizjak@gmail.com>
 
 	PR rtl-optimization/63483

gcc/stor-layout.c

@@ -2400,17 +2400,19 @@ min_align_of_type (tree type)
 {
   unsigned int align = TYPE_ALIGN (type);
   align = MIN (align, BIGGEST_ALIGNMENT);
+  if (!TYPE_USER_ALIGN (type))
+    {
 #ifdef BIGGEST_FIELD_ALIGNMENT
-  align = MIN (align, BIGGEST_FIELD_ALIGNMENT);
+      align = MIN (align, BIGGEST_FIELD_ALIGNMENT);
 #endif
-  unsigned int field_align = align;
+      unsigned int field_align = align;
 #ifdef ADJUST_FIELD_ALIGN
-  tree field = build_decl (UNKNOWN_LOCATION, FIELD_DECL, NULL_TREE,
-			   type);
-  field_align = ADJUST_FIELD_ALIGN (field, field_align);
-  ggc_free (field);
+      tree field = build_decl (UNKNOWN_LOCATION, FIELD_DECL, NULL_TREE, type);
+      field_align = ADJUST_FIELD_ALIGN (field, field_align);
+      ggc_free (field);
 #endif
-  align = MIN (align, field_align);
+      align = MIN (align, field_align);
+    }
   return align / BITS_PER_UNIT;
 }
 

gcc/testsuite/ChangeLog

+2014-10-10  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c/63495
+	* gcc.target/i386/pr63495.c: New test.
+
 2014-10-10  Marek Polacek  <polacek@redhat.com>
 
 	* c-c++-common/ubsan/object-size-1.c: New test.

gcc/testsuite/gcc.target/i386/pr63495.c

+/* PR c/63495 */
+/* { dg-do compile { target { i?86-*-linux* x86_64-*-linux* } } } */
+/* { dg-options "-std=gnu11" } */
+
+struct __attribute__ ((aligned (8))) S { char c; };
+_Static_assert (_Alignof (struct S) >= 8, "wrong alignment");