maint: add a NEWS-checking syntax-check rule

* cfg.mk (sc_NEWS_two_empty_lines): New syntax-check rule.

diff --git a/cfg.mk b/cfg.mk
index 7651ab2..8b3670c 100644 (file)
--- a/cfg.mk
+++ b/cfg.mk
@@ -164,6 +164,13 @@ sc_man_file_correlation:
        @$(MAKE) -s -C src all_programs
        @$(MAKE) -s -C man $@
 
+# Ensure that the end of each release's section is marked by two empty lines.
+sc_NEWS_two_empty_lines:
+       @sed -n 4,/Noteworthy/p $(srcdir)/NEWS                          \
+           | perl -n0e '/(^|\n)\n\n\* Noteworthy/ or exit 1'           \
+         || { echo '$(ME): use two empty lines to separate NEWS sections' \
+                1>&2; exit 1; } || :;                                  \
+
 # Perl-based tests used to exec perl from a #!/bin/sh script.
 # Now they all start with #!/usr/bin/perl and the portability
 # infrastructure is in tests/Makefile.am.  Make sure no old-style