Question

field `tv' has incomplete type

Asked by: palhade

Hi,

I am trying to write program for API of rpm (rpm5.org). I added library for it. And wrote sample program by including #include <rpm/rpmlib.h>.

I am getting following error while compiling source code "field `tv' has incomplete type"

I tried to debug code. This error is in "rpmsw.h" file and in following code

struct rpmsw_s
{
    union
    {
            struct timeval tv;
            unsigned long long int ticks;
            unsigned long int tocks[2];
    } u;
};

I am not sure why this error is happening. As I already complied rmp source code and installed. But this error is happening when i am trying to write sample program for rpm API.

Please help me to resolve this issue.

Thanks in advance

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Asked On
2009-09-16 at 01:25:29ID24735566
Topics

C Programming Language

,

RPM Installer

,

Linux

Participating Experts
3
Points
500
Comments
17

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Answers

 

by: evilrixPosted on 2009-09-16 at 01:27:46ID: 25343172

This means that the compiler has yet to see the full definition of the struct timeval. Have you missed out including the header that contains its definition maybe?

 

by: palhadePosted on 2009-09-16 at 01:34:54ID: 25343220

Hi,

Thanks for your quick reply. I took all the code as it is from rpm5.org and compiled , build and used library generated after build as it is.

I am not sure which header i need to include that contains its definition

Thanks...

 

by: evilrixPosted on 2009-09-16 at 01:38:36ID: 25343239

>> I am not sure which header i need to include that contains its definition
Try time.h

 

by: masheikPosted on 2009-09-16 at 01:39:57ID: 25343248

where is timeval is defined? did you check that?

 

by: evilrixPosted on 2009-09-16 at 01:41:43ID: 25343256

>> where is timeval is defined? did you check that?
Well, on my Linux system it's in time.h :)

/* A time value that is accurate to the nearest
   microsecond but also has a range of years.  */
struct timeval
  {
    __time_t tv_sec;    /* Seconds.  */
    __suseconds_t tv_usec; /* Microseconds.  */
  };  
                                              
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by: Infinity08Posted on 2009-09-16 at 01:42:00ID: 25343260

>> Try time.h

On Linux, struct timeval is usually defined in <sys/time.h>, although that might be indirectly included from another header.

 

by: Infinity08Posted on 2009-09-16 at 01:42:26ID: 25343263

>> Well, on my Linux system it's in time.h :)

Ah. Odd heh.

 

by: masheikPosted on 2009-09-16 at 01:45:15ID: 25343281

 

by: evilrixPosted on 2009-09-16 at 01:45:39ID: 25343283

>> Ah. Odd heh.
Well, ok -- strictly speaking it's in bits/time.h and that is included by time.h but I didn't think it was worth splitting hairs over :)

 

by: palhadePosted on 2009-09-16 at 01:56:51ID: 25343337

Hi,

I tried this #include <sys/time.h>  and now error is gone.

Now i am getting another new errors like "undefined reference to `headerDump' "
How to resolve this "undefined reference to ..." error.

OR
shall i raise new question for this new error. please advice.


Thanks...

 

by: evilrixPosted on 2009-09-16 at 01:59:14ID: 25343350

>> I tried this #include <sys/time.h>  and now error is gone.
I'd suggest including <time.h> instead since timeval may not be defined there on all platforms (it's not on mine) but time.h should include all other necessary headers required.

>> shall i raise new question for this new error. please advice.
Yes please, different issue dictates different question. Thanks.

 

by: Infinity08Posted on 2009-09-16 at 02:28:34ID: 25343517

>> I'd suggest including <time.h> instead since timeval may not be defined there on all platforms

Actually, it's the other way around.

POSIX requires struct timeval to be defined in <sys/time.h>, and there's no mention of it being in <time.h> (although it could be). So, you've got more chance of finding it in <sys/time.h> than in <time.h>.

I'm not sure why that's not the case on your platform - GNU libc for example has it in <sys/time.h>. Which libc are you using ? Try compiling the below sample with a C compiler - it should work on a (partially) POSIX compliant system :

#include <sys/time.h>
 
int main(void) {
  struct timeval test;
  test.tv_sec = 5;
  return 0;
}

                                              
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by: evilrixPosted on 2009-09-16 at 02:31:07ID: 25343532

>> I'm not sure why that's not the case on your platform
No idea :)

 

by: palhadePosted on 2009-09-16 at 02:32:22ID: 25343540

i tried both but it is working fine #include <sys/time.h>. but now getting different error. i raised another question for that.

 

by: evilrixPosted on 2009-09-16 at 02:34:35ID: 25343555

Imported indirectly from bits/time.h

#ifndef _SYS_TIME_H
#define _SYS_TIME_H  1

#include <features.h>

#include <bits/types.h>
#define __need_time_t
#include <time.h>
#define __need_timeval
#include <bits/time.h>

 

by: Infinity08Posted on 2009-09-16 at 02:48:18ID: 25343632

Ah, that puts my mind at ease heh :) I was a bit afraid to have found a Linux system that doesn't conform to POSIX when it comes to timeval ... That could have been a bad precedent.

20120131-EE-VQP-002

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