On 2018-06-20, Gary Johnson wrote:
> On 2018-06-20, Bram Moolenaar wrote:
> > Gary Johnson wrote:
> > 
> > > When compiling Vim 8.1.89 on an Ubuntu Linux system, I get the
> > > following warning.
> > > 
> > >     os_unix.c: In function ‘mch_signal_job’:
> > >     os_unix.c:5851: warning: implicit declaration of function ‘getpgid’
> > > 
> > > I think that means that os_unixx.h should include something like
> > > this:
> > > 
> > >     #ifdef HAVE_GETPGID
> > >     # include <unistd.h>
> > >     #endif
> > > 
> > > but I'm not familiar enough with Vim's include strategy to know for
> > > sure.
> > 
> > We already have this in os_unix.h:
> > 
> >     #ifdef HAVE_UNISTD_H
> >     # include <unistd.h>
> >     #endif
> > 
> > Perhaps you can check src/auto/config.log why unistd.h wasn't found.
> > Mine contains:
> > 
> > configure:11078: checking unistd.h usability
> > configure:11078: gcc -c -g -Wall -Wextra -Wshadow -Wmissing-prototypes 
> > -Wunreachable-code -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1  conftest.c >&5
> > configure:11078: $? = 0
> > configure:11078: result: yes
> > configure:11078: checking unistd.h presence
> > configure:11078: gcc -E  conftest.c
> > configure:11078: $? = 0
> > configure:11078: result: yes
> > configure:11078: checking for unistd.h
> > configure:11078: result: yes
> 
> Mine contains this, which, except for the gcc arguments, looks the same to me.
> 
> configure:11078: checking unistd.h usability
> configure:11078: gcc -std=gnu99 -c -g -DFEAT_CONCEAL -DFEAT_MOUSE_SGR 
> -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1  conftest.c >&5
> configure:11078: $? = 0
> configure:11078: result: yes
> configure:11078: checking unistd.h presence
> configure:11078: gcc -std=gnu99 -E  conftest.c
> configure:11078: $? = 0
> configure:11078: result: yes
> configure:11078: checking for unistd.h
> configure:11078: result: yes
> 
> I don't have an explanation at the moment.  I'll try to look at it
> more this evening.

For /usr/include/unistd.h to include a prototype for getpgid(),
__USE_XOPEN_EXTENDED must be defined, and in this system of mine,
it isn't.

The man page for getpgid() says that _XOPEN_SOURCE >= 500 for
getpgid() to be declared.  In my system, _XOPEN_SOURCE isn't
defined, either.

My gcc version is 4.4.3, if that matters.

Regards,
Gary

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