c-decl.c (finish_struct): Add DECL_EXPR for variable sized structures seen inside functions.

        * c-decl.c (finish_struct): Add DECL_EXPR for variable sized
        structures seen inside functions.

From-SVN: r92371

3 files changed, 26 insertions, 0 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 51ad04e..f9a9b56 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,10 @@
 2004-12-18  Richard Henderson  <rth@redhat.com>
 
+	* c-decl.c (finish_struct): Add DECL_EXPR for variable sized
+	structures seen inside functions.
+
+2004-12-18  Richard Henderson  <rth@redhat.com>
+
 	* c-decl.c (grokdeclarator): Save variable array size before
 	subtracting 1, rather than after.
 
diff --git a/gcc/c-decl.c b/gcc/c-decl.c
index b76e274..26caa2c 100644
--- a/gcc/c-decl.c
+++ b/gcc/c-decl.c
@@ -5401,6 +5401,12 @@ finish_struct (tree t, tree fieldlist, tree attributes)
   /* Finish debugging output for this type.  */
   rest_of_type_compilation (t, toplevel);
 
+  /* If we're inside a function proper, i.e. not file-scope and not still
+     parsing parameters, then arrange for the size of a variable sized type
+     to be bound now.  */
+  if (cur_stmt_list && variably_modified_type_p (t, NULL))
+    add_stmt (build_stmt (DECL_EXPR, build_decl (TYPE_DECL, NULL, t)));
+
   return t;
 }
 
diff --git a/gcc/testsuite/gcc.c-torture/execute/20041218-2.c b/gcc/testsuite/gcc.c-torture/execute/20041218-2.c
new file mode 100644
index 0000000..c4b3627
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/execute/20041218-2.c
@@ -0,0 +1,15 @@
+extern void abort (void);
+
+int test(int n)
+{
+  struct s { char b[n]; };
+  n++;
+  return sizeof(struct s);
+}
+
+int main()
+{
+  if (test(123) != 123)
+    abort ();
+  return 0;
+}