[Bug symtab/17642] New: [7.8 regression] internal-error: resolve_dynamic_struct: Assertion `TYPE_NFIELDS (type) > 0' failed.

["jan.kratochvil at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17642

            Bug ID: 17642
           Summary: [7.8 regression] internal-error:
                    resolve_dynamic_struct: Assertion `TYPE_NFIELDS (type)
                    > 0' failed.
           Product: gdb
           Version: 7.8
            Status: NEW
          Severity: normal
          Priority: P2
         Component: symtab
          Assignee: unassigned at sourceware dot org
          Reporter: jan.kratochvil at redhat dot com
            Target: x86_64-linux-gnu

cat >2.c <<EOH
struct b;
struct c {
  struct b *bp;
} c;
int main(void) { return 0; }
EOH
cat >2b.c <<EOH
struct b {
  int a[0];
} use_b;
EOH
gcc -o 2 2.c 2b.c -Wall -g
# gcc-4.9.2-1.fc21.x86_64
gdb ./2 -ex 'p *c.bp'
# 520c7b56ac91e91120c59d7a85466ec9394277cf
gdbtypes.c:1811: internal-error: resolve_dynamic_struct: Assertion
`TYPE_NFIELDS (type) > 0' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.

Regression since:
commit 012370f6818657a816df1463ee71ca4e4ee40b33
Author: Tom Tromey <tromey@redhat.com>
Date:   Thu May 8 11:26:44 2014 -0600
    handle VLA in a struct or union

Bugreport:
Regression with gdb scripts for Linux kernel
https://sourceware.org/ml/gdb/2014-08/msg00127.html

It is another missing check_typedef().

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