Re: [suggestion] new target GTAGS.

[Shigio Yamaguchi <shigio at tamacom dot com>]

> Here is what I'm adding:
> 
>     ## Support `Global' tags.
>     GTAGS:
> 	    here=`cd $(top_builddir) && pwd` && cd $(top_srcdir) && gtags -i $$
here

All right. Thank you.

> >> By the way, where does automake put tag files to?
> 
> It puts them in the build directory.
> This might be the same as the source directory, if the user chose to
> configure in the source tree.

In BSD system, '/usr/obj' + <current directory> is used for build directory.
(from now on, I say it 'obj' directory.)

	% cd /home/owner/prog
	% make obj			<= make 'obj' directory
	/usr/obj/home/owner/prog created for /home/owner/prog
	% make
	cc -O -pipe -Wall -I/home/owner/prog   -c /home/owner/prog/main.c
	...
	% ls *.o
	ls: No match.			<= source directory is read only.
	% cd /usr/obj/home/owner/prog
	% ls *.o
	main.o   ...		<= *.o files are wrtten in 'obj' directory.
	...

To support BSD build system, global locate tag files not only in source
directory but also in 'obj' directory.

	% cd /home/owner/prog
        % make obj                    		<= make 'obj' directory
	% gtags /usr/obj/home/owner/prog	<= write tag files in 'obj'
	% ls G*					   directory.
	ls: No match.
	% global -x main
	main              83 main.c        main(argc, argv)
	% cd /usr/obj/home/owner/prog
	% ls G*
	GPATH   GRTAGS  GSYMS   GTAGS

If there is a convention in automake, I can support it.
--
Shigio Yamaguchi - Tama Communications Corporation
Mail: shigio@tamacom.com, (Spare mail: shigio@par.odn.ne.jp)