c++/1753: g++ 2.95.2 generates incorrect code when __attribute__((packed)) is combined with bitfields

cruden@cs.ualberta.ca cruden@cs.ualberta.ca
Tue Jan 23 21:26:00 GMT 2001


>Number:         1753
>Category:       c++
>Synopsis:       g++ 2.95.2 generates incorrect code when __attribute__((packed)) is combined with bitfields
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Jan 23 21:26:00 PST 2001
>Closed-Date:
>Last-Modified:
>Originator:     Charles Cruden (cruden@cs.ualberta.ca)
>Release:        g++ 2.95.2
>Organization:
>Environment:
Linux RedHat 6.2
>Description:
If g++ encounters bitfields in a structure, followed by
members which are __attribute__((packed)), and the bitfields
do not make up a full byte/word/dword, the packed member
ends up occupying the same place in memory as the bitfields.
This only occurs when compiling with g++: if gcc is used on
the same input, the generated output is correct.

In the given example, the correct output should be 0.  
Using g++ it is 1.  This occurs whether or not member a
of the structure has __attribute__((packed)) following it,
but only occurs if member x has __attribute__((packed)) 
following it.
>How-To-Repeat:
The code is:

#include <stdio.h>

typedef struct {
  unsigned char a : 1;
  unsigned char x __attribute__((packed));
} test;

int main () {
  test t = {0, 0};

  t.a = 1;
  printf ("%x\n", t.x);
}

If written to test.c, do:
g++ test.c
and run a.out.
>Fix:
If the bitfield members are padded to fill a whole
byte/word/dword, the output is correct.
>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: application/octet-stream; name="test.ii"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="test.ii"

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