[PATCH dwarves v2 2/3] pahole: Don't match unions with --with_flexible_array

[Aditya Dutt <duttaditya18@gmail.com>]

C doesn't allow a flexible array member in a union, but
--with_flexible_array prints unions anyway.

  $ cat flex.c
  union wrap_u { int a; long b; };
  union wrap_u u;

  $ pahole --with_flexible_array flex.o
  union wrap_u {
        int                        a;                  /*     0     4 */
        long int                   b;                  /*     0     8 */
  };

--with_embedded_flexible_array doesn't have this problem because its
option handler also sets just_structs.

Add both to the list so neither relies on that side effect.

After:

  $ pahole --with_flexible_array flex.o
  $

Structs with a flexible array are unaffected:

  $ cat has_flex.c
  struct has_flex { int n; char data[]; };
  struct has_flex *p;

  $ pahole --with_flexible_array has_flex.o
  struct has_flex {
        int                        n;                    /*     0     4 */
        char                       data[];               /*     4     0 */

        /* size: 4, cachelines: 1, members: 2 */
        /* last cacheline: 4 bytes */
  };

Signed-off-by: Aditya Dutt <duttaditya18@gmail.com>
---
 pahole.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pahole.c b/pahole.c
index 7ec4a74..d2dcd90 100644
--- a/pahole.c
+++ b/pahole.c
@@ -734,7 +734,8 @@ static struct class *class__filter(struct class *class, struct cu *cu,
 	 */
 	if (!tag__is_struct(tag))
 		return (just_structs || show_packable || nr_holes || nr_bit_holes || hole_size_ge ||
-			end_padding_ge || end_padding) ? NULL : class;
+			end_padding_ge || end_padding || show_with_flexible_array ||
+			show_with_embedded_flexible_array) ? NULL : class;
 
 	if (tag->top_level)
 		class__find_holes(class);
-- 
2.50.1