libctf: fix cv-qualified unnamed struct/union field lookup

GCC permits not only unnamed structs and unions, but cv-qualified ones.
Our earlier fix in 6c3a38777b38a2ad87e2b2bcec4567578d1c83ec supported
unnamed structs and unions, but only unqualified ones.

Resolving away cvr-quals of nameless fields (and, irrelevantly, typedefs)
is easy and fixes this problem.

Tests adjusted accordingly.

libctf/
	PR libctf/32746
	* ctf-types.c (ctf_member_next): Resolve away cv-quals.
	(ctf_member_info): Likewise.
	* testsuite/libctf-lookup/struct-iteration-ctf.c: Add a cv-qualified
	type or two: make sure to keep a non-qualified one.
	* testsuite/libctf-lookup/struct-iteration.c: Verify consistency
	of ctf_member_next and ctf_member_info.
	* testsuite/libctf-lookup/struct-iteration.lk: Adjust.

Tested-by: Stephen Brennan <stephen.s.brennan@oracle.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/libctf/testsuite/libctf-lookup/struct-iteration-ctf.c b/libctf/testsuite/libctf-lookup/struct-iteration-ctf.c
index 7df67ad..0a50d2c 100644
--- a/libctf/testsuite/libctf-lookup/struct-iteration-ctf.c
+++ b/libctf/testsuite/libctf-lookup/struct-iteration-ctf.c
@@ -6,12 +6,12 @@ struct foo_t
   size_t bar;
   const char *baz;
   struct foo_t *self;
-  union
+  const volatile union
   {
     double should_not_appear;
     char *nor_should_this;
   } named;
-  struct
+  volatile const struct
   {
     long unnamed_sub_member;
     union
@@ -19,6 +19,9 @@ struct foo_t
       double one_more_level;
       long yes_really_one_more;
     };
+    struct {
+      int and_finally;
+    };
   };
   struct {};		/* Empty ones */
   union {};