build: refactor how lists of coreutils programs are defined

This is in preparation of future changes.  Still, this patch
leaves the build system in a better shape; true, with more
indirections, but also with less convoluted and brittle hacks.

Unfortunately, this commit also makes some rebuild rules
incomplete; that will son be fixed by follow-up patches.

* build-aux/gen-lists-of-programs.sh: New, generates autoconf
and automake input fragments that define "lists" of all coreutils
programs, with further distinctions about how and when these
programs should be built (by default; if the system is capable
enough; only if the user asks for them explicitly).  This is
useful to avoid duplicating the definitions of these lists among
several files (at least 'configure.ac' 'src/Makefile.am'); such
duplication had proved a source of inconsistencies and bugs in
the past.  And the pre-existing way to avoid such duplication,
as implemented in 'configure.ac' before this patch, was overly
complex and brittle.
* Makefile.am (EXTRA_DIST): Distribute the new script.
* bootstrap.conf (bootstrap_post_import_hook): Run the new script
to generate 'm4/cu-progs.m4' and 'src/cu-progs.mk'.
* .gitignore: Ignore those files.
* configure.ac: Include 'm4/cu-progs.m4', and decidedly simplify
most of the program lists definition and processing accordingly.
* src/Makefile.am: Similarly include 'src/cu-progs.mk', containing
definition of variables $(default__progs), $(no_install__progs)
and $(build_if_possible__progs).  Accordingly ...
(no_install__progs, build_if_possible__progs): ... remove.
(EXTRA_DIST): Adjust definition.
Adjust a comment.

1 files changed, 10 insertions, 115 deletions

diff --git a/src/Makefile.am b/src/Makefile.am
index 9be3acfbc..3b0ef6593 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -15,124 +15,18 @@
 ## You should have received a copy of the GNU General Public License
 ## along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-# These are the names of programs that are not installed by default.
-# This list is *not* intended for programs like who, nice, chroot, etc.,
-# that are built only when certain requisite system features are detected.
-# Hence, if you want to install programs from this list anyway, say A and B,
-# use --enable-install-program=A,B
-no_install__progs = \
-  arch hostname
-
-build_if_possible__progs = \
-  chroot	\
-  df		\
-  hostid	\
-  libstdbuf.so	\
-  nice		\
-  pinky		\
-  stdbuf	\
-  stty		\
-  uptime	\
-  users		\
-  who
-
 AM_CFLAGS = $(WARN_CFLAGS) $(WERROR_CFLAGS)
 
+# The list of all programs (separated in different variables to express
+# the how and when they should be installed) is defined in this makefile
+# fragment, autogenerated by the 'gen-lists-of-programs.sh' auxiliary
+# script.
+include $(srcdir)/cu-progs.mk
+
 EXTRA_PROGRAMS = \
   $(no_install__progs) \
   $(build_if_possible__progs) \
-  [		\
-  base64	\
-  basename	\
-  cat		\
-  chcon		\
-  chgrp		\
-  chmod		\
-  chown		\
-  cksum		\
-  comm		\
-  cp		\
-  csplit	\
-  cut		\
-  date		\
-  dd		\
-  dir		\
-  dircolors	\
-  dirname	\
-  du		\
-  echo		\
-  env		\
-  expand	\
-  expr		\
-  factor	\
-  false		\
-  fmt		\
-  fold		\
-  ginstall	\
-  groups	\
-  head		\
-  id		\
-  join		\
-  kill		\
-  link		\
-  ln		\
-  logname	\
-  ls		\
-  md5sum	\
-  mkdir		\
-  mkfifo	\
-  mknod		\
-  mktemp	\
-  mv		\
-  nl		\
-  nproc		\
-  nohup		\
-  od		\
-  paste		\
-  pathchk	\
-  pr		\
-  printenv	\
-  printf	\
-  ptx		\
-  pwd		\
-  readlink	\
-  realpath	\
-  rm		\
-  rmdir		\
-  runcon	\
-  seq		\
-  sha1sum	\
-  sha224sum	\
-  sha256sum	\
-  sha384sum	\
-  sha512sum	\
-  shred		\
-  shuf		\
-  sleep		\
-  sort		\
-  split		\
-  stat		\
-  sum		\
-  sync		\
-  tac		\
-  tail		\
-  tee		\
-  test		\
-  timeout	\
-  touch		\
-  tr		\
-  true		\
-  truncate	\
-  tsort		\
-  tty		\
-  uname		\
-  unexpand	\
-  uniq		\
-  unlink	\
-  vdir		\
-  wc		\
-  whoami	\
-  yes
+  $(default__progs)
 
 bin_PROGRAMS = $(OPTIONAL_BIN_PROGS)
 
@@ -620,8 +514,9 @@ check-README:
 	$(AM_V_at)diff $(pm) $(pr) && rm -rf $(pr) $(pm)
 
 # Ensure that a by-default-not-installed program (listed in
-# $(no_install__progs) is not also listed in $(EXTRA_PROGRAMS), because
-# if that were to happen, it *would* be installed by default.
+# $(no_install__progs) is not also listed as another $(EXTRA_PROGRAMS)
+# entry, because if that were to happen, it *would* be installed
+# by default.
 .PHONY: check-duplicate-no-install
 check-duplicate-no-install: tr
 	$(AM_V_GEN)test -z "`echo '$(EXTRA_PROGRAMS)'| ./tr ' ' '\n' | uniq -d`"