* c-typeck.c (set_init_index): Allow array designators that are

	not integer constant expressions with a pedwarn if pedantic.

testsuite:
	* gcc.dg/array-const-1.c, gcc.dg/array-const-2.c,
	gcc.dg/array-const-3.c: New tests.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@146741 138bc75d-0d04-0410-961f-82ee72b054a4

6 files changed, 54 insertions, 0 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index a48db46dcd5..51d848d755b 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2009-04-24  Joseph Myers  <joseph@codesourcery.com>
+
+	* c-typeck.c (set_init_index): Allow array designators that are
+	not integer constant expressions with a pedwarn if pedantic.
+
 2009-04-24  Bernd Schmidt  <bernd.schmidt@analog.com>
 
 	* simplify-rtx.c (simplify_binary_operation_1, case AND): Result is
diff --git a/gcc/c-typeck.c b/gcc/c-typeck.c
index c7ea3284ac0..1cfab1f14f2 100644
--- a/gcc/c-typeck.c
+++ b/gcc/c-typeck.c
@@ -6422,6 +6422,24 @@ set_init_index (tree first, tree last)
     }
 
   if (TREE_CODE (first) != INTEGER_CST)
+    {
+      first = c_fully_fold (first, false, NULL);
+      if (TREE_CODE (first) == INTEGER_CST)
+	pedwarn_init (input_location, OPT_pedantic,
+		      "array index in initializer is not "
+		      "an integer constant expression");
+    }
+
+  if (last && TREE_CODE (last) != INTEGER_CST)
+    {
+      last = c_fully_fold (last, false, NULL);
+      if (TREE_CODE (last) == INTEGER_CST)
+	pedwarn_init (input_location, OPT_pedantic,
+		      "array index in initializer is not "
+		      "an integer constant expression");
+    }
+
+  if (TREE_CODE (first) != INTEGER_CST)
     error_init ("nonconstant array index in initializer");
   else if (last != 0 && TREE_CODE (last) != INTEGER_CST)
     error_init ("nonconstant array index in initializer");
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index b4ec0dd5cac..083a7e3efa5 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2009-04-24  Joseph Myers  <joseph@codesourcery.com>
+
+	* gcc.dg/array-const-1.c, gcc.dg/array-const-2.c,
+	gcc.dg/array-const-3.c: New tests.
+
 2009-04-24  Ian Lance Taylor  <iant@google.com>
 
 	* gcc.dg/Wcxx-compat-4.c: New testcase.
diff --git a/gcc/testsuite/gcc.dg/array-const-1.c b/gcc/testsuite/gcc.dg/array-const-1.c
new file mode 100644
index 00000000000..0e0c46224cf
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/array-const-1.c
@@ -0,0 +1,8 @@
+/* Test for array designators not integer constant expressions but
+   folding to integer constants (used in Linux kernel,
+   <http://gcc.gnu.org/ml/gcc/2009-04/msg00611.html>).  */
+/* { dg-do compile } */
+/* { dg-options "-std=gnu99" } */
+
+extern int i;
+int a[] = { [1 ? 1 : i] = 0 };
diff --git a/gcc/testsuite/gcc.dg/array-const-2.c b/gcc/testsuite/gcc.dg/array-const-2.c
new file mode 100644
index 00000000000..f6e2bd5bbfa
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/array-const-2.c
@@ -0,0 +1,9 @@
+/* Test for array designators not integer constant expressions but
+   folding to integer constants (used in Linux kernel,
+   <http://gcc.gnu.org/ml/gcc/2009-04/msg00611.html>).  */
+/* { dg-do compile } */
+/* { dg-options "-std=gnu99 -pedantic" } */
+
+extern int i;
+int a[] = { [1 ? 1 : i] = 0 }; /* { dg-warning "array index in initializer is not an integer constant expression" } */
+/* { dg-warning "near initialization" "near init" { target *-*-* } 8 } */
diff --git a/gcc/testsuite/gcc.dg/array-const-3.c b/gcc/testsuite/gcc.dg/array-const-3.c
new file mode 100644
index 00000000000..5bb215cbd0f
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/array-const-3.c
@@ -0,0 +1,9 @@
+/* Test for array designators not integer constant expressions but
+   folding to integer constants (used in Linux kernel,
+   <http://gcc.gnu.org/ml/gcc/2009-04/msg00611.html>).  */
+/* { dg-do compile } */
+/* { dg-options "-std=gnu99 -pedantic-errors" } */
+
+extern int i;
+int a[] = { [1 ? 1 : i] = 0 }; /* { dg-error "array index in initializer is not an integer constant expression" } */
+/* { dg-error "near initialization" "near init" { target *-*-* } 8 } */