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Re: PATCH RFA: Improve -Wcast-qual warning for C
"Joseph S. Myers" <joseph@codesourcery.com> writes:
> On Mon, 25 May 2009, Ian Lance Taylor wrote:
>
>> As discussed at http://gcc.gnu.org/ml/gcc/2009-05/msg00533.html , the
>> C++ compiler issues more warnings for -Wcast-qual than the C compiler
>> does. After a bit of further discussion on IRC, I think the general
>> consensus is that the C compiler should issue warnings about unsafe
>> casts much as the C++ compiler does. Recall that this is only when
>> using -Wcast-qual, and that -Wcast-qual is not part of -Wall.
>>
>> The first patch in this message implements the appropriate warnings.
>> This patch requires approval from the C frontend maintainers.
>
> I do not believe this is implementing the correct semantics.
>
> The requirement for safety in multi-level casts is not that the final
> qualifier appears at the intermediate levels, it is that "const" appears
> at all levels before any level at which a qualifier is added; that is, if
> the C++ rules would permit a qualification conversion with that sequence
> of qualifiers. The example
>
> void
> f5 (char ***bar)
> {
> volatile char * const * const * p19 = bar;
> }
>
> is accepted by the C++ front end as this is a safe implicit conversion, as
> is the version with a cast when using -Wcast-qual.
You're right, I did misunderstand. Now fixed. Thanks.
> I think you should also add a C++ testcase that is essentially identical
> to the C one to verify that the same semantics are being followed for the
> option by both front ends.
Done.
Here is the updated patch. Bootstrapped and tested on
x86_64-unknown-linux-gnu. The second patch in
http://gcc.gnu.org/ml/gcc-patches/2009-05/msg01608.html
is unchanged.
Ian
gcc/ChangeLog:
2009-05-29 Ian Lance Taylor <iant@google.com>
* c-typeck.c (handle_warn_cast_qual): New static function,
partially broken out of build_c_cast.
(build_c_cast): Call handle_warn_cast_qual.
* doc/invoke.texi (Warning Options): Document new effect of
-Wcast-qual.
gcc/testsuite/ChangeLog:
2009-05-29 Ian Lance Taylor <iant@google.com>
* gcc.dg/cast-qual-3.c: New testcase.
* g++.dg/warn/Wcast-qual2.C: New testcase.
Index: gcc/c-typeck.c
===================================================================
--- gcc/c-typeck.c (revision 147842)
+++ gcc/c-typeck.c (working copy)
@@ -4055,6 +4055,93 @@ build_compound_expr (tree expr1, tree ex
return ret;
}
+/* Issue -Wcast-qual warnings when appropriate. TYPE is the type to
+ which we are casting. OTYPE is the type of the expression being
+ cast. Both TYPE and OTYPE are pointer types. -Wcast-qual appeared
+ on the command line. */
+
+static void
+handle_warn_cast_qual (tree type, tree otype)
+{
+ tree in_type = type;
+ tree in_otype = otype;
+ int added = 0;
+ int discarded = 0;
+ bool is_const;
+
+ /* Check that the qualifiers on IN_TYPE are a superset of the
+ qualifiers of IN_OTYPE. The outermost level of POINTER_TYPE
+ nodes is uninteresting and we stop as soon as we hit a
+ non-POINTER_TYPE node on either type. */
+ do
+ {
+ in_otype = TREE_TYPE (in_otype);
+ in_type = TREE_TYPE (in_type);
+
+ /* GNU C allows cv-qualified function types. 'const' means the
+ function is very pure, 'volatile' means it can't return. We
+ need to warn when such qualifiers are added, not when they're
+ taken away. */
+ if (TREE_CODE (in_otype) == FUNCTION_TYPE
+ && TREE_CODE (in_type) == FUNCTION_TYPE)
+ added |= (TYPE_QUALS (in_type) & ~TYPE_QUALS (in_otype));
+ else
+ discarded |= (TYPE_QUALS (in_otype) & ~TYPE_QUALS (in_type));
+ }
+ while (TREE_CODE (in_type) == POINTER_TYPE
+ && TREE_CODE (in_otype) == POINTER_TYPE);
+
+ if (added)
+ warning (OPT_Wcast_qual, "cast adds new qualifiers to function type");
+
+ if (discarded)
+ /* There are qualifiers present in IN_OTYPE that are not present
+ in IN_TYPE. */
+ warning (OPT_Wcast_qual,
+ "cast discards qualifiers from pointer target type");
+
+ if (added || discarded)
+ return;
+
+ /* A cast from **T to const **T is unsafe, because it can cause a
+ const value to be changed with no additional warning. We only
+ issue this warning if T is the same on both sides, and we only
+ issue the warning if there are the same number of pointers on
+ both sides, as otherwise the cast is clearly unsafe anyhow. A
+ cast is unsafe when a qualifier is added at one level and const
+ is not present at all outer levels.
+
+ To issue this warning, we check at each level whether the cast
+ adds new qualifiers not already seen. We don't need to special
+ case function types, as they won't have the same
+ TYPE_MAIN_VARIANT. */
+
+ if (TYPE_MAIN_VARIANT (in_type) != TYPE_MAIN_VARIANT (in_otype))
+ return;
+ if (TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE)
+ return;
+
+ in_type = type;
+ in_otype = otype;
+ is_const = TYPE_READONLY (TREE_TYPE (in_type));
+ do
+ {
+ in_type = TREE_TYPE (in_type);
+ in_otype = TREE_TYPE (in_otype);
+ if ((TYPE_QUALS (in_type) &~ TYPE_QUALS (in_otype)) != 0
+ && !is_const)
+ {
+ warning (OPT_Wcast_qual,
+ ("new qualifiers in middle of multi-level non-const cast "
+ "are unsafe"));
+ break;
+ }
+ if (is_const)
+ is_const = TYPE_READONLY (in_type);
+ }
+ while (TREE_CODE (in_type) == POINTER_TYPE);
+}
+
/* Build an expression representing a cast to type TYPE of expression EXPR. */
tree
@@ -4139,46 +4226,10 @@ build_c_cast (tree type, tree expr)
otype = TREE_TYPE (value);
/* Optionally warn about potentially worrisome casts. */
-
if (warn_cast_qual
&& TREE_CODE (type) == POINTER_TYPE
&& TREE_CODE (otype) == POINTER_TYPE)
- {
- tree in_type = type;
- tree in_otype = otype;
- int added = 0;
- int discarded = 0;
-
- /* Check that the qualifiers on IN_TYPE are a superset of
- the qualifiers of IN_OTYPE. The outermost level of
- POINTER_TYPE nodes is uninteresting and we stop as soon
- as we hit a non-POINTER_TYPE node on either type. */
- do
- {
- in_otype = TREE_TYPE (in_otype);
- in_type = TREE_TYPE (in_type);
-
- /* GNU C allows cv-qualified function types. 'const'
- means the function is very pure, 'volatile' means it
- can't return. We need to warn when such qualifiers
- are added, not when they're taken away. */
- if (TREE_CODE (in_otype) == FUNCTION_TYPE
- && TREE_CODE (in_type) == FUNCTION_TYPE)
- added |= (TYPE_QUALS (in_type) & ~TYPE_QUALS (in_otype));
- else
- discarded |= (TYPE_QUALS (in_otype) & ~TYPE_QUALS (in_type));
- }
- while (TREE_CODE (in_type) == POINTER_TYPE
- && TREE_CODE (in_otype) == POINTER_TYPE);
-
- if (added)
- warning (OPT_Wcast_qual, "cast adds new qualifiers to function type");
-
- if (discarded)
- /* There are qualifiers present in IN_OTYPE that are not
- present in IN_TYPE. */
- warning (OPT_Wcast_qual, "cast discards qualifiers from pointer target type");
- }
+ handle_warn_cast_qual (type, otype);
/* Warn about possible alignment problems. */
if (STRICT_ALIGNMENT
Index: gcc/doc/invoke.texi
===================================================================
--- gcc/doc/invoke.texi (revision 147842)
+++ gcc/doc/invoke.texi (working copy)
@@ -3689,6 +3689,19 @@ Warn whenever a pointer is cast so as to
the target type. For example, warn if a @code{const char *} is cast
to an ordinary @code{char *}.
+Also warn when making a cast which introduces a type qualifier in an
+unsafe way. For example, casting @code{char **} to @code{const char **}
+is unsafe, as in this example:
+
+@smallexample
+ /* p is char ** value. */
+ const char **q = (const char **) p;
+ /* Assignment of readonly string to const char * is OK. */
+ *q = "string";
+ /* Now char** pointer points to read-only memory. */
+ **p = 'b';
+@end smallexample
+
@item -Wcast-align
@opindex Wcast-align
@opindex Wno-cast-align
Index: gcc/testsuite/gcc.dg/cast-qual-3.c
===================================================================
--- gcc/testsuite/gcc.dg/cast-qual-3.c (revision 0)
+++ gcc/testsuite/gcc.dg/cast-qual-3.c (revision 0)
@@ -0,0 +1,167 @@
+/* { dg-do compile } */
+/* { dg-options "-Wcast-qual" } */
+
+/* The files gcc.dg/cast-qual-3.c and g++.dg/warn/Wcast-qual2.c are
+ duals. they are intended to show that gcc -Wcast-qual and g++
+ -Wcast-qual emit warnings in the same cases. If you change this
+ file, please also change the other one. */
+
+void
+f1 (void *bar)
+{
+ const void *p1 = (const void *) bar;
+ const char *p2 = (const char *) bar;
+ const void **p3 = (const void **) bar;
+ const char **p4 = (const char **) bar;
+ const void * const *p5 = (const void * const *) bar;
+ const char * const *p6 = (const char * const *) bar;
+ void * const *p7 = (void * const *) bar;
+ char * const *p8 = (char * const *) bar;
+ const void ***p9 = (const void ***) bar;
+ const char ***p10 = (const char ***) bar;
+ void * const **p11 = (void * const **) bar;
+ char * const **p12 = (char * const **) bar;
+ void ** const *p13 = (void ** const *) bar;
+ char ** const *p14 = (char ** const *) bar;
+ const void * const **p15 = (const void * const **) bar;
+ const char * const **p16 = (const char * const **) bar;
+ const void ** const *p17 = (const void ** const *) bar;
+ const char ** const *p18 = (const char ** const *) bar;
+ void * const * const * p19 = (void * const * const *) bar;
+ char * const * const * p20 = (char * const * const *) bar;
+ const void * const * const *p21 = (const void * const * const *) bar;
+ const char * const * const *p22 = (const char * const * const *) bar;
+}
+
+void
+f2 (void **bar)
+{
+ const void *p1 = (const void *) bar;
+ const char *p2 = (const char *) bar;
+ const void **p3 = (const void **) bar; /* { dg-warning "cast" } */
+ const char **p4 = (const char **) bar;
+ const void * const *p5 = (const void * const *) bar;
+ const char * const *p6 = (const char * const *) bar;
+ void * const *p7 = (void * const *) bar;
+ char * const *p8 = (char * const *) bar;
+ const void ***p9 = (const void ***) bar;
+ const char ***p10 = (const char ***) bar;
+ void * const **p11 = (void * const **) bar;
+ char * const **p12 = (char * const **) bar;
+ void ** const *p13 = (void ** const *) bar;
+ char ** const *p14 = (char ** const *) bar;
+ const void * const **p15 = (const void * const **) bar;
+ const char * const **p16 = (const char * const **) bar;
+ const void ** const *p17 = (const void ** const *) bar;
+ const char ** const *p18 = (const char ** const *) bar;
+ void * const * const * p19 = (void * const * const *) bar;
+ char * const * const * p20 = (char * const * const *) bar;
+ const void * const * const *p21 = (const void * const * const *) bar;
+ const char * const * const *p22 = (const char * const * const *) bar;
+}
+
+void
+f3 (void ***bar)
+{
+ const void *p1 = (const void *) bar;
+ const char *p2 = (const char *) bar;
+ const void **p3 = (const void **) bar;
+ const char **p4 = (const char **) bar;
+ const void * const *p5 = (const void * const *) bar;
+ const char * const *p6 = (const char * const *) bar;
+ void * const *p7 = (void * const *) bar;
+ char * const *p8 = (char * const *) bar;
+ const void ***p9 = (const void ***) bar; /* { dg-warning "cast" } */
+ const char ***p10 = (const char ***) bar;
+ void * const **p11 = (void * const **) bar; /* { dg-warning "cast" } */
+ char * const **p12 = (char * const **) bar;
+ void ** const *p13 = (void ** const *) bar;
+ char ** const *p14 = (char ** const *) bar;
+ const void * const **p15 = (const void * const **) bar; /* { dg-warning "cast" } */
+ const char * const **p16 = (const char * const **) bar;
+ const void ** const *p17 = (const void ** const *) bar; /* { dg-warning "cast" } */
+ const char ** const *p18 = (const char ** const *) bar;
+ void * const * const * p19 = (void * const * const *) bar;
+ char * const * const * p20 = (char * const * const *) bar;
+ const void * const * const *p21 = (const void * const * const *) bar;
+ const char * const * const *p22 = (const char * const * const *) bar;
+}
+
+void
+f4 (void * const **bar)
+{
+ const void ***p9 = (const void ***) bar; /* { dg-warning "cast" } */
+ void * const **p11 = (void * const **) bar;
+ void ** const *p13 = (void ** const *) bar; /* { dg-warning "cast" } */
+ const void * const **p15 = (const void * const **) bar; /* { dg-warning "cast" } */
+ const void ** const *p17 = (const void ** const *) bar; /* { dg-warning "cast" } */
+ void * const * const * p19 = (void * const * const *) bar;
+ const void * const * const *p21 = (const void * const * const *) bar;
+}
+
+void
+f5 (char ***bar)
+{
+ volatile const char ***p9 = (volatile const char ***) bar; /* { dg-warning "cast" } */
+ volatile char * const **p11 = (volatile char * const **) bar; /* { dg-warning "cast" } */
+ volatile char ** const *p13 = (volatile char ** const *) bar; /* { dg-warning "cast" } */
+ volatile const char * const **p15 = (volatile const char * const **) bar; /* { dg-warning "cast" } */
+ volatile const char ** const *p17 = (volatile const char ** const *) bar; /* { dg-warning "cast" } */
+ volatile char * const * const * p19 = (volatile char * const * const *) bar;
+ volatile const char * const * const *p21 = (volatile const char * const * const *) bar;
+}
+
+void
+f6 (char ***bar)
+{
+ const char * volatile **p9 = (const char * volatile **) bar; /* { dg-warning "cast" } */
+ char * volatile const **p11 = (char * volatile const **) bar; /* { dg-warning "cast" } */
+ char * volatile * const *p13 = (char * volatile * const *) bar;
+ const char * volatile const **p15 = (const char * volatile const **) bar; /* { dg-warning "cast" } */
+ const char * volatile * const *p17 = (const char * volatile * const *) bar; /* { dg-warning "cast" } */
+ char * volatile const * const * p19 = (char * volatile const * const *) bar;
+ const char * volatile const * const *p21 = (const char * volatile const * const *) bar;
+}
+
+void
+f7 (char ***bar)
+{
+ const char ** volatile *p9 = (const char ** volatile *) bar; /* { dg-warning "cast" } */
+ char * const * volatile *p11 = (char * const * volatile *) bar; /* { dg-warning "cast" } */
+ char ** volatile const *p13 = (char ** volatile const *) bar;
+ const char * const * volatile *p15 = (const char * const * volatile *) bar; /* { dg-warning "cast" } */
+ const char ** volatile const *p17 = (const char ** volatile const *) bar; /* { dg-warning "cast" } */
+ char * const * volatile const * p19 = (char * const * volatile const *) bar;
+ const char * const * volatile const *p21 = (const char * const * volatile const *) bar;
+}
+
+typedef int (intfn) (int);
+typedef intfn *pintfn;
+typedef const intfn *constfn;
+
+void
+f8 (constfn ***bar)
+{
+ const constfn *p1 = (const constfn *) bar;
+ const pintfn *p2 = (const pintfn *) bar;
+ const constfn **p3 = (const constfn **) bar;
+ const pintfn **p4 = (const pintfn **) bar;
+ const constfn * const *p5 = (const constfn * const *) bar;
+ const pintfn * const *p6 = (const pintfn * const *) bar;
+ constfn * const *p7 = (constfn * const *) bar;
+ pintfn * const *p8 = (pintfn * const *) bar;
+ const constfn ***p9 = (const constfn ***) bar; /* { dg-warning "cast" } */
+ const pintfn ***p10 = (const pintfn ***) bar; /* { dg-warning "cast" } */
+ constfn * const **p11 = (constfn * const **) bar; /* { dg-warning "cast" } */
+ pintfn * const **p12 = (pintfn * const **) bar; /* { dg-warning "cast" } */
+ constfn ** const *p13 = (constfn ** const *) bar;
+ pintfn ** const *p14 = (pintfn ** const *) bar;
+ const constfn * const **p15 = (const constfn * const **) bar; /* { dg-warning "cast" } */
+ const pintfn * const **p16 = (const pintfn * const **) bar; /* { dg-warning "cast" } */
+ const constfn ** const *p17 = (const constfn ** const *) bar; /* { dg-warning "cast" } */
+ const pintfn ** const *p18 = (const pintfn ** const *) bar; /* { dg-warning "cast" } */
+ constfn * const * const * p19 = (constfn * const * const *) bar;
+ pintfn * const * const * p20 = (pintfn * const * const *) bar;
+ const constfn * const * const *p21 = (const constfn * const * const *) bar;
+ const pintfn * const * const *p22 = (const pintfn * const * const *) bar;
+}
Index: gcc/testsuite/g++.dg/warn/Wcast-qual2.C
===================================================================
--- gcc/testsuite/g++.dg/warn/Wcast-qual2.C (revision 0)
+++ gcc/testsuite/g++.dg/warn/Wcast-qual2.C (revision 0)
@@ -0,0 +1,167 @@
+/* { dg-do compile } */
+/* { dg-options "-Wcast-qual" } */
+
+/* The files gcc.dg/cast-qual-3.c and g++.dg/warn/Wcast-qual2.c are
+ duals. they are intended to show that gcc -Wcast-qual and g++
+ -Wcast-qual emit warnings in the same cases. If you change this
+ file, please also change the other one. */
+
+void
+f1 (void *bar)
+{
+ const void *p1 = (const void *) bar;
+ const char *p2 = (const char *) bar;
+ const void **p3 = (const void **) bar;
+ const char **p4 = (const char **) bar;
+ const void * const *p5 = (const void * const *) bar;
+ const char * const *p6 = (const char * const *) bar;
+ void * const *p7 = (void * const *) bar;
+ char * const *p8 = (char * const *) bar;
+ const void ***p9 = (const void ***) bar;
+ const char ***p10 = (const char ***) bar;
+ void * const **p11 = (void * const **) bar;
+ char * const **p12 = (char * const **) bar;
+ void ** const *p13 = (void ** const *) bar;
+ char ** const *p14 = (char ** const *) bar;
+ const void * const **p15 = (const void * const **) bar;
+ const char * const **p16 = (const char * const **) bar;
+ const void ** const *p17 = (const void ** const *) bar;
+ const char ** const *p18 = (const char ** const *) bar;
+ void * const * const * p19 = (void * const * const *) bar;
+ char * const * const * p20 = (char * const * const *) bar;
+ const void * const * const *p21 = (const void * const * const *) bar;
+ const char * const * const *p22 = (const char * const * const *) bar;
+}
+
+void
+f2 (void **bar)
+{
+ const void *p1 = (const void *) bar;
+ const char *p2 = (const char *) bar;
+ const void **p3 = (const void **) bar; /* { dg-warning "cast" } */
+ const char **p4 = (const char **) bar;
+ const void * const *p5 = (const void * const *) bar;
+ const char * const *p6 = (const char * const *) bar;
+ void * const *p7 = (void * const *) bar;
+ char * const *p8 = (char * const *) bar;
+ const void ***p9 = (const void ***) bar;
+ const char ***p10 = (const char ***) bar;
+ void * const **p11 = (void * const **) bar;
+ char * const **p12 = (char * const **) bar;
+ void ** const *p13 = (void ** const *) bar;
+ char ** const *p14 = (char ** const *) bar;
+ const void * const **p15 = (const void * const **) bar;
+ const char * const **p16 = (const char * const **) bar;
+ const void ** const *p17 = (const void ** const *) bar;
+ const char ** const *p18 = (const char ** const *) bar;
+ void * const * const * p19 = (void * const * const *) bar;
+ char * const * const * p20 = (char * const * const *) bar;
+ const void * const * const *p21 = (const void * const * const *) bar;
+ const char * const * const *p22 = (const char * const * const *) bar;
+}
+
+void
+f3 (void ***bar)
+{
+ const void *p1 = (const void *) bar;
+ const char *p2 = (const char *) bar;
+ const void **p3 = (const void **) bar;
+ const char **p4 = (const char **) bar;
+ const void * const *p5 = (const void * const *) bar;
+ const char * const *p6 = (const char * const *) bar;
+ void * const *p7 = (void * const *) bar;
+ char * const *p8 = (char * const *) bar;
+ const void ***p9 = (const void ***) bar; /* { dg-warning "cast" } */
+ const char ***p10 = (const char ***) bar;
+ void * const **p11 = (void * const **) bar; /* { dg-warning "cast" } */
+ char * const **p12 = (char * const **) bar;
+ void ** const *p13 = (void ** const *) bar;
+ char ** const *p14 = (char ** const *) bar;
+ const void * const **p15 = (const void * const **) bar; /* { dg-warning "cast" } */
+ const char * const **p16 = (const char * const **) bar;
+ const void ** const *p17 = (const void ** const *) bar; /* { dg-warning "cast" } */
+ const char ** const *p18 = (const char ** const *) bar;
+ void * const * const * p19 = (void * const * const *) bar;
+ char * const * const * p20 = (char * const * const *) bar;
+ const void * const * const *p21 = (const void * const * const *) bar;
+ const char * const * const *p22 = (const char * const * const *) bar;
+}
+
+void
+f4 (void * const **bar)
+{
+ const void ***p9 = (const void ***) bar; /* { dg-warning "cast" } */
+ void * const **p11 = (void * const **) bar;
+ void ** const *p13 = (void ** const *) bar; /* { dg-warning "cast" } */
+ const void * const **p15 = (const void * const **) bar; /* { dg-warning "cast" } */
+ const void ** const *p17 = (const void ** const *) bar; /* { dg-warning "cast" } */
+ void * const * const * p19 = (void * const * const *) bar;
+ const void * const * const *p21 = (const void * const * const *) bar;
+}
+
+void
+f5 (char ***bar)
+{
+ volatile const char ***p9 = (volatile const char ***) bar; /* { dg-warning "cast" } */
+ volatile char * const **p11 = (volatile char * const **) bar; /* { dg-warning "cast" } */
+ volatile char ** const *p13 = (volatile char ** const *) bar; /* { dg-warning "cast" } */
+ volatile const char * const **p15 = (volatile const char * const **) bar; /* { dg-warning "cast" } */
+ volatile const char ** const *p17 = (volatile const char ** const *) bar; /* { dg-warning "cast" } */
+ volatile char * const * const * p19 = (volatile char * const * const *) bar;
+ volatile const char * const * const *p21 = (volatile const char * const * const *) bar;
+}
+
+void
+f6 (char ***bar)
+{
+ const char * volatile **p9 = (const char * volatile **) bar; /* { dg-warning "cast" } */
+ char * volatile const **p11 = (char * volatile const **) bar; /* { dg-warning "cast" } */
+ char * volatile * const *p13 = (char * volatile * const *) bar;
+ const char * volatile const **p15 = (const char * volatile const **) bar; /* { dg-warning "cast" } */
+ const char * volatile * const *p17 = (const char * volatile * const *) bar; /* { dg-warning "cast" } */
+ char * volatile const * const * p19 = (char * volatile const * const *) bar;
+ const char * volatile const * const *p21 = (const char * volatile const * const *) bar;
+}
+
+void
+f7 (char ***bar)
+{
+ const char ** volatile *p9 = (const char ** volatile *) bar; /* { dg-warning "cast" } */
+ char * const * volatile *p11 = (char * const * volatile *) bar; /* { dg-warning "cast" } */
+ char ** volatile const *p13 = (char ** volatile const *) bar;
+ const char * const * volatile *p15 = (const char * const * volatile *) bar; /* { dg-warning "cast" } */
+ const char ** volatile const *p17 = (const char ** volatile const *) bar; /* { dg-warning "cast" } */
+ char * const * volatile const * p19 = (char * const * volatile const *) bar;
+ const char * const * volatile const *p21 = (const char * const * volatile const *) bar;
+}
+
+typedef int (intfn) (int);
+typedef intfn *pintfn;
+typedef const intfn *constfn;
+
+void
+f8 (constfn ***bar)
+{
+ const constfn *p1 = (const constfn *) bar;
+ const pintfn *p2 = (const pintfn *) bar;
+ const constfn **p3 = (const constfn **) bar;
+ const pintfn **p4 = (const pintfn **) bar;
+ const constfn * const *p5 = (const constfn * const *) bar;
+ const pintfn * const *p6 = (const pintfn * const *) bar;
+ constfn * const *p7 = (constfn * const *) bar;
+ pintfn * const *p8 = (pintfn * const *) bar;
+ const constfn ***p9 = (const constfn ***) bar; /* { dg-warning "cast" } */
+ const pintfn ***p10 = (const pintfn ***) bar; /* { dg-warning "cast" } */
+ constfn * const **p11 = (constfn * const **) bar; /* { dg-warning "cast" } */
+ pintfn * const **p12 = (pintfn * const **) bar; /* { dg-warning "cast" } */
+ constfn ** const *p13 = (constfn ** const *) bar;
+ pintfn ** const *p14 = (pintfn ** const *) bar;
+ const constfn * const **p15 = (const constfn * const **) bar; /* { dg-warning "cast" } */
+ const pintfn * const **p16 = (const pintfn * const **) bar; /* { dg-warning "cast" } */
+ const constfn ** const *p17 = (const constfn ** const *) bar; /* { dg-warning "cast" } */
+ const pintfn ** const *p18 = (const pintfn ** const *) bar; /* { dg-warning "cast" } */
+ constfn * const * const * p19 = (constfn * const * const *) bar;
+ pintfn * const * const * p20 = (pintfn * const * const *) bar;
+ const constfn * const * const *p21 = (const constfn * const * const *) bar;
+ const pintfn * const * const *p22 = (const pintfn * const * const *) bar;
+}