* stor-layout.c (layout_type): If TYPE_ALIAS_SET was already set on the

	incomplete type force it into alias set 0.

	* gcc.c-torture/execute/20001024-1.c: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@37052 138bc75d-0d04-0410-961f-82ee72b054a4

4 files changed, 51 insertions, 0 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index e9e2a1c9144..79a9fc2d555 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2000-10-25  Jakub Jelinek  <jakub@redhat.com>
+
+	* stor-layout.c (layout_type): If TYPE_ALIAS_SET was already set on the
+	incomplete type force it into alias set 0.
+
 Wed Oct 25 01:02:44 EDT 2000  John Wehle  (john@feith.com)
 
 	* alias.c: Include basic-block.h.
diff --git a/gcc/stor-layout.c b/gcc/stor-layout.c
index 797b4cea17d..8d41cd18221 100644
--- a/gcc/stor-layout.c
+++ b/gcc/stor-layout.c
@@ -1504,6 +1504,14 @@ layout_type (type)
      record it so set_sizetype can fix it up.  */
   if (! sizetype_set)
     early_type_list = tree_cons (NULL_TREE, type, early_type_list);
+
+  /* If an alias set has been set for this aggregate when it was incomplete,
+     force it into alias set 0.
+     This is too conservative, but we cannot call record_component_aliases
+     here because some frontends still change the aggregates after
+     layout_type.  */
+  if (AGGREGATE_TYPE_P (type) && TYPE_ALIAS_SET_KNOWN_P (type))
+    TYPE_ALIAS_SET (type) = 0;
 }
 
 /* Create and return a type for signed integers of PRECISION bits.  */
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index ac355b2d191..f61fb4eac02 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2000-10-25  Jakub Jelinek  <jakub@redhat.com>
+
+	* gcc.c-torture/execute/20001024-1.c: New test.
+
 2000-10-24  Jakub Jelinek  <jakub@redhat.com>
 
 	* g++.old-deja/g++.other/sibcall1.C: New test.
diff --git a/gcc/testsuite/gcc.c-torture/execute/20001024-1.c b/gcc/testsuite/gcc.c-torture/execute/20001024-1.c
new file mode 100644
index 00000000000..42be8abca6a
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/execute/20001024-1.c
@@ -0,0 +1,34 @@
+struct a;
+
+extern int baz (struct a *__restrict x);
+
+struct a {
+  long v;
+  long w;
+};
+
+struct b {
+  struct a c;
+  struct a d;
+};
+
+int bar (int x, const struct b *__restrict y, struct b *__restrict z)
+{
+  if (y->c.v || y->c.w != 250000 || y->d.v || y->d.w != 250000)
+    abort();
+}
+
+void foo(void)
+{
+  struct b x;
+  x.c.v = 0;
+  x.c.w = 250000;
+  x.d = x.c;
+  bar(0, &x, ((void *)0));
+}
+
+int main()
+{
+  foo();
+  exit(0);
+}