Re: build without gnuplot

[Svante Signell]

What about something like the below (has to be tested of course)

On Tue, 2012-04-24 at 13:59 -0400, Ben Abbott wrote:
> On Apr 24, 2012, at 12:26 PM, Mike Miller wrote:
> 
> > On Tue, Apr 24, 2012 at 11:28 AM, Ben Abbott <address@hidden> wrote:
> >> Any autotools experts know how difficult it would be to check to see if 
> >> gnuplot exists before trying to build the docs ?
> >> 
> >>        https://savannah.gnu.org/bugs/index.php?36255
> > 
> > No need, the check is already done, $GNUPLOT and $warn_gnuplot
> > variables are set appropriately, just need a new check at the end to
> > combine the pieces, print a message, and disable the doc conditional.
> > 
> > -- 
> > mike
> 
> In configure.ac I see the pieces below, but am not familiar with the details. 
> What needs to be done to --disable-docs ?
> 
>  188 ### Make it possible to disable running Make in the doc directory.
>  189 ### Useful for building on systems without TeX, for example.
>  190 DOCDIR=doc
>  191 AC_ARG_ENABLE(docs,
>  192   [AS_HELP_STRING([--enable-docs], [build documentation (default is 
> yes)])],
>  193   [if test "$enableval" = no; then
>  194      DOCDIR=
>  195      warn_docs="building documentation disabled; make dist will fail"
>  196      AC_MSG_WARN([$warn_docs])
>  197    fi], [])
>  198 AC_SUBST(DOCDIR)
>  199 AM_CONDITIONAL([AMCOND_BUILD_DOCS], [test -n "$DOCDIR"])
> 
> 
> 2484 if test -n "$warn_gnuplot"; then
> 2485   if $native_graphics; then
> 2486     AC_MSG_WARN([])
> 2487     AC_MSG_WARN([I didn't find gnuplot.  Plotting commands will use the])
> 2488     AC_MSG_WARN([native graphics toolkit.])
> 2489   else
> 2490     AC_MSG_WARN([I didn't find gnuplot.  It isn't necessary to have 
> gnuplot])
> 2491     AC_MSG_WARN([installed, but you won't be able to use any of 
> Octave's])
> 2492     AC_MSG_WARN([plotting commands without it.])
> 2493   fi
> 2494   AC_MSG_WARN([])
> 2495   AC_MSG_WARN([If gnuplot is installed, but isn't in your path, you can])
> 2496   AC_MSG_WARN([tell Octave where to find it by using the gnuplot_binary])
> 2497   AC_MSG_WARN([function.  For example,])
> 2498   AC_MSG_WARN([])
> 2499   AC_MSG_WARN([gnuplot_binary ("/full/path/and/name/of/gnuplot/binary")])
> 2500   AC_MSG_WARN([])
> 2501   AC_MSG_WARN([at the Octave prompt.])
> 2502   AC_MSG_WARN([])
> 2503   AC_MSG_WARN([Setting default value to $GNUPLOT])
> 2504   AC_MSG_WARN([])
> 2505 
> 2506   warn_msg_printed=true
  DOCDIR=
  warn_docs="building documentation disabled; gnuplot not found"
  AC_MSG_WARN([$warn_docs])
> 2507 fi

Don't know what happens if --enable-docs is given and gnuplot is missing
though. Then both tests have to be combined.