[gnuastro-devel] [task #14157] Installed script for automatic linking using Libtool

[Mohammad Akhlaghi]

URL:
  <http://savannah.gnu.org/task/?14157>

                 Summary: Installed script for automatic linking using Libtool
                 Project: GNU Astronomy Utilities
            Submitted by: makhlaghi
            Submitted on: Sat 17 Sep 2016 02:34:55 AM JST
         Should Start On: Sat 17 Sep 2016 12:00:00 AM JST
   Should be Finished on: Sat 17 Sep 2016 12:00:00 AM JST
                Category: Libraries
                Priority: 5 - Normal
              Item Group: Enhancement
                  Status: Postponed
                 Privacy: Public
        Percent Complete: 30%
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                  Effort: 0.00

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Details:

With a recent commit, the "Automatic linking script" subsection was added to
the "Libraries". A small shell function is introduced in this section for
using Libtool to automatically link with all the necessary libraries Gnuastro
depends on. The function is shown below, (to be put in `.bashrc' and after
correcting PREFIX)


function gnuastro-gcc {
  libtool --mode=link gcc $1.c $2 PREFIX/lib/libgnuastro.la -o $1
}


With this shell function instead of running something like this (in the
extreme case where all libraries would be necessary):


$ gcc myprog.c -o myprog -lgnuastro -lwcs -lcfitsio -lgsl -lgslcblas -pthread
-lm


You can just run (see the subsection for a little more detailed explanation):


$ gnuastro-gcc myprog


Libtool's `libgnuastro.la' has all the necessary information for correct
linking, we (the user) doesn't have to memorize them (or look them up in the
manual).

Here, I am proposing to create this script when running `make install' and
installing it along with the rest of Gnuastro. In the installed script we can
use environment variables like `CPPFLAGS', `LDADD' or etc, along with all the
extra information that `./configure' has found (like the compiler) to allow
people to build small Gnuastro programs much more easier.




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