GNU bug report logs - #18508
Incomplete type pollfd

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Andreas Enge <andreas <at> enge.fr>
To: bug-guile <at> gnu.org
Subject: Incomplete type pollfd
Date: Fri, 19 Sep 2014 12:16:15 +0200

[Message part 1 (text/plain, inline)]

Hello,

guile-2.0.11 fails to build on Redhat 6.5 with the following error message:

  CC       libguile_2.0_la-fports.lo
fports.c: In function 'fport_input_waiting':
fports.c:612: error: variable 'pollfd' has initializer but incomplete type
fports.c:612: warning: excess elements in struct initializer
fports.c:612: warning: (near initialization for 'pollfd')
fports.c:612: error: 'POLLIN' undeclared (first use in this function)
fports.c:612: error: (Each undeclared identifier is reported only once
fports.c:612: error: for each function it appears in.)
fports.c:612: warning: excess elements in struct initializer
fports.c:612: warning: (near initialization for 'pollfd')
fports.c:612: warning: excess elements in struct initializer
fports.c:612: warning: (near initialization for 'pollfd')
fports.c:612: error: storage size of 'pollfd' isn't known
fports.c:614: warning: implicit declaration of function 'poll'
fports.c:612: warning: unused variable 'pollfd'
make[3]: *** [libguile_2.0_la-fports.lo] Error 1
make[3]: Leaving directory `/home/enge/lib-intel/guile-2.0.11/libguile'

Versions of software used:
gcc 4.4.7
libffi 3.0.5
libunistring 0.9.3
libgc 7.1
ltdl 2.2.6
gmp 4.3.1
pkg-config 0.23

I am attaching the config.log.

Andreas

[config.log.xz (application/octet-stream, attachment)]

Message #8 received at 18508 <at> debbugs.gnu.org (full text, mbox):

From: ludo <at> gnu.org (Ludovic Courtès)
To: Andreas Enge <andreas <at> enge.fr>
Cc: 18508 <at> debbugs.gnu.org
Subject: Re: bug#18508: Incomplete type pollfd
Date: Mon, 22 Sep 2014 10:43:27 +0200

Andreas Enge <andreas <at> enge.fr> skribis:

> guile-2.0.11 fails to build on Redhat 6.5 with the following error message:
>
>   CC       libguile_2.0_la-fports.lo
> fports.c: In function 'fport_input_waiting':
> fports.c:612: error: variable 'pollfd' has initializer but incomplete type
> fports.c:612: warning: excess elements in struct initializer
> fports.c:612: warning: (near initialization for 'pollfd')
> fports.c:612: error: 'POLLIN' undeclared (first use in this function)
> fports.c:612: error: (Each undeclared identifier is reported only once
> fports.c:612: error: for each function it appears in.)
> fports.c:612: warning: excess elements in struct initializer
> fports.c:612: warning: (near initialization for 'pollfd')
> fports.c:612: warning: excess elements in struct initializer
> fports.c:612: warning: (near initialization for 'pollfd')
> fports.c:612: error: storage size of 'pollfd' isn't known
> fports.c:614: warning: implicit declaration of function 'poll'
> fports.c:612: warning: unused variable 'pollfd'
> make[3]: *** [libguile_2.0_la-fports.lo] Error 1
> make[3]: Leaving directory `/home/enge/lib-intel/guile-2.0.11/libguile'
>
> Versions of software used:
> gcc 4.4.7

What libc version is this?

It would have been great, if this is still possible, to post lib/poll.h.
Normally that file uses #include_next to get libc’s <poll.h>, but maybe
that mechanism somehow fails with old GCC versions.

Ludo’.

Message #13 received at 18508 <at> debbugs.gnu.org (full text, mbox):

From: Andreas Enge <andreas <at> enge.fr>
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: 18508 <at> debbugs.gnu.org
Subject: Re: bug#18508: Incomplete type pollfd
Date: Fri, 26 Sep 2014 16:40:00 +0200

[Message part 1 (text/plain, inline)]

On Mon, Sep 22, 2014 at 10:43:27AM +0200, Ludovic Courtès wrote:
> What libc version is this?

The package is glibc-2.12-1.107.el6_4.5.x86_64.

> It would have been great, if this is still possible, to post lib/poll.h.
> Normally that file uses #include_next to get libc’s <poll.h>, but maybe
> that mechanism somehow fails with old GCC versions.

I just retried the compilation, and poll.h is attached. It contains
#if 1
# include_next <poll.h>
#endif

There is a /usr/include/poll.h, which contains the one line
#include <sys/poll.h>
This in turn does an
#include <bits/poll.h>
which has a line
#define POLLIN          0x001           /* There is data to read.  */

I tried to replace the # include_next in lib/poll.h by a simple #include,
but that leads to
../lib/poll.h:31:18: error: #include nested too deeply

Andreas

[poll.h (text/plain, attachment)]

Message #16 received at 18508 <at> debbugs.gnu.org (full text, mbox):

From: ludo <at> gnu.org (Ludovic Courtès)
To: Andreas Enge <andreas <at> enge.fr>
Cc: 18508 <at> debbugs.gnu.org
Subject: Re: bug#18508: Incomplete type pollfd
Date: Sat, 27 Sep 2014 11:41:09 +0200

Andreas Enge <andreas <at> enge.fr> skribis:

> On Mon, Sep 22, 2014 at 10:43:27AM +0200, Ludovic Courtès wrote:
>> What libc version is this?
>
> The package is glibc-2.12-1.107.el6_4.5.x86_64.

Oh, OK.

>> It would have been great, if this is still possible, to post lib/poll.h.
>> Normally that file uses #include_next to get libc’s <poll.h>, but maybe
>> that mechanism somehow fails with old GCC versions.
>
> I just retried the compilation, and poll.h is attached. It contains
> #if 1 
> # include_next <poll.h>
> #endif

Normally that should be enough to get the ‘struct pollfd’ definition no?

Does something like this build correctly with ‘gcc -Wall -c’:

--8<---------------cut here---------------start------------->8---
#include <poll.h>

int
foo (struct pollfd *x)
{
  return x->events;
}
--8<---------------cut here---------------end--------------->8---

Thanks,
Ludo’.

Message #19 received at 18508 <at> debbugs.gnu.org (full text, mbox):

From: Andreas Enge <andreas <at> enge.fr>
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: 18508 <at> debbugs.gnu.org
Subject: Re: bug#18508: Incomplete type pollfd
Date: Sat, 27 Sep 2014 14:40:06 +0200

On Sat, Sep 27, 2014 at 11:41:09AM +0200, Ludovic Courtès wrote:
> Does something like this build correctly with ‘gcc -Wall -c’:
> 
> --8<---------------cut here---------------start------------->8---
> #include <poll.h>
> 
> int
> foo (struct pollfd *x)
> {
>   return x->events;
> }
> --8<---------------cut here---------------end--------------->8---

Yes, without any warning.

Andreas

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