[PATCH v2 5/9] maint: improve remake rules for maintainers

[Stefano Lattarini]

This is a follow up on today's former commit "build: refactor
how lists of coreutils programs are defined".

* Makefile.am ($(top_srcdir)/m4/cu-progs.m4,
$(srcdir)/src/cu-progs.mk): New, generate these files from the
'build-aux/gen-lists-of-programs.sh', the same way it's done
from the bootstrap script.
* bootstrap.conf (bootstrap_post_import_hook): Add comment about
the necessity to keep those new rules synced with the commands
here.  Enhance those commands so to that the generated files are
set read-only.
---
 Makefile.am    | 15 +++++++++++++++
 bootstrap.conf | 10 +++++++---
 2 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/Makefile.am b/Makefile.am
index 6a56f68..2d5fdaa 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -55,6 +55,21 @@ EXTRA_DIST =                         \
   maint.mk                             \
   thanks-gen
 
+gen_progs_lists = $(top_srcdir)/build-aux/gen-lists-of-programs.sh
+
+# Keep these in sync with bootstrap.conf:bootstrap_post_import_hook().
+# Use '$(top_srcdir)/m4' and '$(srcdir)/src' for the benefit of non-GNU
+# makes: it is with those directories that 'cu-progs.m4' and 'cu-progs.mk'
+# appear in our dependencies.
+$(top_srcdir)/m4/cu-progs.m4: $(gen_progs_lists)
+       $(AM_V_GEN)rm -f $@ $@-t \
+         && $(SHELL) $(gen_progs_lists) --autoconf >$@-t \
+         && chmod a-w $@-t && mv -f $@-t $@
+$(srcdir)/src/cu-progs.mk: $(gen_progs_lists)
+       $(AM_V_GEN)rm -f $@ $@-t \
+         && $(SHELL) $(gen_progs_lists) --automake >$@-t \
+         && chmod a-w $@-t && mv -f $@-t $@
+
 ALL_RECURSIVE_TARGETS += install-root
 install-root:
        cd src && $(MAKE) $@
diff --git a/bootstrap.conf b/bootstrap.conf
index 4ef3fc8..dc0ffb6 100644
--- a/bootstrap.conf
+++ b/bootstrap.conf
@@ -329,9 +329,13 @@ bootstrap_post_import_hook ()
   # Automake requires that ChangeLog exist.
   touch ChangeLog || return 1
   # List of coreutils programs.  See heading comments in the invoked
-  # script for more info.
-  build-aux/gen-lists-of-programs.sh --autoconf >m4/cu-progs.m4  || return 1
-  build-aux/gen-lists-of-programs.sh --automake >src/cu-progs.mk || return 1
+  # script for more info.  Keep this in sync with the rules in
+  (m4f=m4/cu-progs.m4 mkf=src/cu-progs.mk tmp=cu-progs.tmp \
+    && rm -f $m4f $mkf $tmp-1 $tmp-2 \
+    && build-aux/gen-lists-of-programs.sh --autoconf >$tmp-1 \
+    && build-aux/gen-lists-of-programs.sh --automake >$tmp-2 \
+    && chmod a-w $tmp-1 $tmp-2 \
+    && mv -f $tmp-1 $m4f && mv -f $tmp-2 $mkf)
 }
 
 bootstrap_epilogue()
-- 
1.7.12