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From: "dje at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/94225] New: C18 conformance for structure implicit
 initialization
Date: Thu, 19 Mar 2020 15:31:43 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c
X-Bugzilla-Version: 10.0
X-Bugzilla-Keywords: wrong-code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94225

            Bug ID: 94225
           Summary: C18 conformance for structure implicit initialization
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dje at gcc dot gnu.org
  Target Milestone: ---

Example 12 in section 6.7.9 of the C18 standard demonstrates that implicit
initialization does not override prior explicit initialization.  The follow=
ing
is the example code with error checking added.

$ cat example12.c
#include <stdio.h>

struct T {
  int k;
  int l;
};
struct S {
  int i;
  struct T t;
};

struct T x =3D {.l =3D 43, .k =3D 42, };
int main(void)
{
  struct S l =3D { 1, .t =3D x, .t.l =3D 41, };
  if (l.t.k !=3D 42)
    fprintf(stderr, "l.t.k is %d instead of 42\n", l.t.k);
}

$ ./xgcc -B./ -std=3Dgnu1x example12.c
$ ./a.out
l.t.k is 0 instead of 42
$=