#pragma pack() problems with gcc-2.95 19990608 on sparc-redhat-linux

#pragma pack() problems with gcc-2.95 19990608 on sparc-redhat-linux

[GUYOMARCH Rémi]

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Here's a little test case which fail on gcc-2.95 19990608 but succeed on
egcs 1.1.2 on the same platform (sparc-redhat-linux RH 5.2).

With gcc version egcs-2.91.66 19990314 (egcs-1.1.2 release) :

	$ gcc -g -Wall zz.cpp ; ./a.out 
	struct:      0x208c0
	logfiletype: 0x208c4

With gcc version gcc-2.95 19990608 (prerelease) :

	$ egcc -g -Wall zz.cpp ; ./a.out 
	struct:      0x208c0
	logfiletype: 0x208c1		<-- int not aligned
	Bus error (core dumped)


Yes, I know pragmas are evil, but this used to work with egcs 1.1.2.
Btw, the info docs say that #pragma(0) should reset alignment to the
defaults, but both compiler complains about a bad pragma.

Here's the source :
--------------------------
#include <stdio.h>

#pragma pack(1)
struct {
  char toto;
  int titi;
  char tata[3];
} zz3;
#pragma pack()

struct {
  char percprint;  
  int  logfileType;
} logstatics;

void update( int *z ) { *z = 1; }

int main( void ) {
  printf( "struct:      %p\n"
	  "logfiletype: %p\n",
	  &logstatics, &logstatics.logfileType );
  update( &logstatics.logfileType );
}
--------------------------

-- 
Rémi Guyomarch
LAN / Network Admin
Inventaire Forestier National
French National Forest Inventory
http://www.ifn.fr/

RE: #pragma pack() problems with gcc-2.95 19990608 on sparc-redhat-linux

[GUYOMARCH Rémi]

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btw, It's probably the same bug which was reported in 
http://egcs.cygnus.com/ml/egcs-bugs/1999-05/msg00488.html
and
http://egcs.cygnus.com/ml/egcs-bugs/1999-05/msg00046.html

> -----Original Message-----
> From:	GUYOMARCH Rémi 
> Sent:	Wednesday, June 16, 1999 5:00 PM
> To:	'egcs-bugs'
> Subject:	#pragma pack() problems with gcc-2.95 19990608 on
> sparc-redhat-linux
> 
> Here's a little test case which fail on gcc-2.95 19990608 but succeed on
> egcs 1.1.2 on the same platform (sparc-redhat-linux RH 5.2).
> 
> With gcc version egcs-2.91.66 19990314 (egcs-1.1.2 release) :
> 
> 	$ gcc -g -Wall zz.cpp ; ./a.out 
> 	struct:      0x208c0
> 	logfiletype: 0x208c4
> 
> With gcc version gcc-2.95 19990608 (prerelease) :
> 
> 	$ egcc -g -Wall zz.cpp ; ./a.out 
> 	struct:      0x208c0
> 	logfiletype: 0x208c1		<-- int not aligned
> 	Bus error (core dumped)
> 
> 
> Yes, I know pragmas are evil, but this used to work with egcs 1.1.2.
> Btw, the info docs say that #pragma(0) should reset alignment to the
> defaults, but both compiler complains about a bad pragma.
> 
> Here's the source :
> --------------------------
> #include <stdio.h>
> 
> #pragma pack(1)
> struct {
>   char toto;
>   int titi;
>   char tata[3];
> } zz3;
> #pragma pack()
> 
> struct {
>   char percprint;  
>   int  logfileType;
> } logstatics;
> 
> void update( int *z ) { *z = 1; }
> 
> int main( void ) {
>   printf( "struct:      %p\n"
> 	  "logfiletype: %p\n",
> 	  &logstatics, &logstatics.logfileType );
>   update( &logstatics.logfileType );
> }
> --------------------------
> 
> -- 
> Rémi Guyomarch
> LAN / Network Admin
> Inventaire Forestier National
> French National Forest Inventory
> http://www.ifn.fr/
> 
>From khan@xraylith.wisc.EDU Wed Jun 16 08:44:00 1999
From: Mumit Khan <khan@xraylith.wisc.EDU>
To: GUYOMARCH Rémi <rguyomarch@ifn.fr>
Cc: "'egcs-bugs'" <egcs-bugs@egcs.cygnus.com>
Subject: Re: #pragma pack() problems with gcc-2.95 19990608 on sparc-redha t-linux 
Date: Wed, 16 Jun 1999 08:44:00 -0000
Message-id: <199906161437.JAA23220@mercury.xraylith.wisc.edu>
References: <73B62B5669A9D2119B230090273A92AD05F0@quercus.ifn.fr>
X-SW-Source: 1999-06/msg00461.html
Content-length: 468

=?iso-8859-1?Q?GUYOMARCH_R=E9mi?= <rguyomarch@ifn.fr> writes:
> 
> btw, It's probably the same bug which was reported in=20
> http://egcs.cygnus.com/ml/egcs-bugs/1999-05/msg00488.html
> and
> http://egcs.cygnus.com/ml/egcs-bugs/1999-05/msg00046.html
> 

This should be fixed in post-1999-06-09 CVS or snapshots. 

Wed Jun  9 03:10:34 1999  Mumit Khan  <khan@xraylith.wisc.edu>

	* c-pragma.c (handle_pragma_token): Handle `#pragma pack()'
	correctly.

Regards,
Mumit