topic Re: how can i use the #pragma pack() in following example in Operating System - Linux

how can i use the #pragma pack() in following example

satish_16 — Mon, 31 Mar 2003 06:23:20 GMT

hi,
thanks for the information.
because of U i have got a new point.but till now also my problem was didn't solved.
i am using the #pragma pack()
in my example like following
#include
#pragma pack(push,<4>)
typedef struct messageheader
{
char x[2];
long logtime;
char alphachar[2];
short transactioncode;
short errorcode;
}msg;
#pragma pack(push)

#pragma pack(push,<4>)
typedef struct logonrequest
{
msg h;
short userid;
char pwd[8];
char newpwd[8];
char reserved[30];
}logon;
#pragma pack(push)

while running this program i am getting warnings like this:

malformed '#pragma pack(push[,id],)'
so,please make a solution for this and send it to me.

Re: how can i use the #pragma pack() in following example

Michael Brailsford — Tue, 01 Apr 2003 07:52:59 GMT

Assuming that you are using gcc/g++ then you do it like this:

struct foo {
int bar;
int baz;
} __attributes__ (());

gcc does not recognize #pragma push and #pragma pop, those two pragmas are msvc++ #pragmas, if I am not mistaken.

Re: how can i use the #pragma pack() in following example

Goran Koruga — Tue, 01 Apr 2003 09:42:01 GMT

I mentioned this before here :

http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0xb230b941255cd71190080090279cd0f9,00.html

But they're obviously ignoring it.

G.

Re: how can i use the #pragma pack() in following example

jonyav — Wed, 25 Dec 2013 12:24:40 GMT

Over 10 years later, I ran into the same problem and found this post, which was unhelpful. Later I found the problem myself, it consists of two parts:
1. gcc doesn't support #pragma pack up to version 2.96
2. gcc 2.96 and up supports #pragma pack, but at least the version I'm using (WindRiver's ccppc 2.96) supports it only if the line endings are Unix style (LF only).
Hope I'll be helpful for someone in the future.