The original version was implemented by Diego Elio 'Flameeyes' Pettenò
two years ago:
http://thread.gmane.org/gmane.linux.utilities.util-linux-ng/3297
See also:
http://www.flameeyes.eu/autotools-mythbuster/automake/nonrecursive.html
My current version is available at github, 'non-recursive' branch:
https://github.com/karelzak/util-linux/commits/non-recursive
Notes:
* generate one Makefile for whole package
* make(1) has all information to run tasks in parallel
* numbers (make -j)
recursive | non-recursive
----------+--------------
2 cores: 14.5 sec | 13.2 sec
16 cores: 9.5 sec | 4.3 sec
(... more CPU cores means more fun;-)
* automake variables and rules are defined in subdir/Makemodule.am files
(create one huge Makefile.am is too crazy idea)
* top-level Makefile.am includes all Makemodule.am files
* $(top_srcdir) prefix for lib/ and include/ is unnecessary, just use
lib/bar.c and include/bar.h in makefiles
* lib/ has been converted to libcommon.la, it means that
foo_LDADD = libcommon.la
is enough to use arbitrary stuff from lib/.
* all rules are interpreted from top-level directory, it means that
cd subdir; make
or
make -C subdir
does not work.
* binaries are stored in top-level (build) directory, you don't
have to care about directories, just type:
$ make mount
$ ./mount --help
* all build targets (including test binaries) are visible for bash completion
scripts (e.g. /etc/bash_completion.d/make), so <tab> is your good friend
* disadvantages:
- full paths in makefiles (e.g. foo_SOURCE = subdir/foo.c)
- we can't use the same name for subdir/ and for a final binary
Necessary changes:
- remove partx/ directory, move partx.c to disk-utils/
- remove getopt/ directory, move getopt.c to misc-utils/
- remove hwclock/ directory, move hwclock.c to sys-utils/
- rename fdisk/ to fdisks/
- rename mount/ to mount-deprecated/ (we use new sys-utils/mount.c)
Note that consolidate the code and remove some subdirs (e.g. getopt/) is
probably a good idea independently on the build-system changes.
Comments & objections?
Karel
--
Karel Zak <kzak@xxxxxxxxxx>
http://karelzak.blogspot.com
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