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From: "vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug exp/26519] New: wrong type used when printing value
Date: Fri, 21 Aug 2020 14:02:22 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D26519

            Bug ID: 26519
           Summary: wrong type used when printing value
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: exp
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

Consider the following test-case:
...
$ cat test.c
struct ab
{
  int a;
  int b;
};

extern void bar (void *p);
extern void foo (struct ab *);

int
main (void)
{
  struct ab ab;
  struct { float a, b; } f =3D { 1.1, 2.1 };
  bar (&f);
  foo (&ab);
  return 0;
}
$ cat test2.c
struct ab;

void
foo (struct ab *p)
{
}
$ cat test3.c
struct ab;

extern void bar2(struct ab *);

void
bar (struct ab *p)
{
  bar2 (p);
}
$ cat test4.c
struct ab {
  float a;
  float b;
};

void
bar2 (struct ab *p)
{

}
...

Compiled like this:
...
$ gcc -g test.c test2.c test3.c test4.c
...

When we run to bar and print "*p"
...
$ gdb -batch -iex "set language c" a.out -ex "b bar" -ex run -ex "p *p"
Breakpoint 1 at 0x4004ef: file test3.c, line 8.

Breakpoint 1, bar (p=3D0x7fffffffdc00) at test3.c:8
8         bar2 (p);
$1 =3D {a =3D 1066192077, b =3D 1074161254}
...
we use the type struct ab from test.c to print *p, which is incorrect.

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