Re: minor problem with util-int.c v1.19

[Phil Tracy <ptracy@northwestern.edu>]

At 02:02 PM 3/8/00 , Kurt Zeilenga wrote:
> At 01:15 PM 3/8/00 -0600, Phil Tracy wrote:
> >I'm compiling the latest (as of 3/8/00 9:00 AM) collection of stuff from
> >CVS on HP/UX 10.20 with gcc 2.95.2.  I had to add
> >
> >      extern int h_errno;
> >
> >to ~pkg/ldap/libraries/libldap/util-int.c (version 1.19) in order to get it
> >to compile properly.  All the tests pass, but I haven't done more testing
> >than that.
>
> Adding explicit externs to .c files is not wise as they may
> conflict with those contained in system headers.
>
> Does <netdb.h> or other header provide an extern for h_errno?
> If not, we'll have to write a macro to detect the lack of an
> h_errno extern, define a macro and conditionally provide an
> extern (in include/ac/socket.h).

As a matter of fact it does, though it's surrounded by an #ifdef:

   #ifdef _XOPEN_SOURCE_EXTENDED
   extern int h_errno;
   #endif

There are several other things that seem to depend on the opposite setting 
for _XOPEN_SOURCE_EXTENDED, though; for instance:

   #ifndef _XOPEN_SOURCE_EXTENDED
   #ifdef _REENTRANT
   struct  hostent_data {
      ...
   }
   ...
   #endif
   #endif

And nearly the entire netdb.h file is wrapped by

   #ifdef _INCLUDE_XOPEN_SOURCE_EXTENDED

This is fast getting beyond my knowledge of HP/UX, but I'd be happy to 
provide copies of man pages and/or .h files if it would help someone else 
puzzle this out.

Is this why many vendors are reluctant to support threads on HP 
platforms?  It looks like a pain in the butt.  When I have a chance, I'll 
try building this on an HP/UX 11 system and see if it's any different.