maint.mk: prohibit unwarranted use of <strings.h>

* top/maint.mk (sc_prohibit_strings_without_use): Reject inclusion of
strings.h in a file that does not also use strcasecmp, strncasecmp,
ffs or ffsll.

2 files changed, 12 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 797a381415..4378ddbc96 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -6,6 +6,11 @@
 
 2010-05-03  Jim Meyering  <meyering@redhat.com>
 
+	maint.mk: prohibit unwarranted use of <strings.h>
+	* top/maint.mk (sc_prohibit_strings_without_use): Reject inclusion of
+	strings.h in a file that does not also use strcasecmp, strncasecmp,
+	ffs or ffsll.
+
 	maint.mk: remove obsolete comments
 	* top/maint.mk: Remove stale, commented-out rules.
 
diff --git a/top/maint.mk b/top/maint.mk
index 66dc9b6cb7..9bca202b40 100644
--- a/top/maint.mk
+++ b/top/maint.mk
@@ -544,6 +544,13 @@ sc_prohibit_signal_without_use:
 	re='\<($(_sig_function_re)) *\(|\<($(_sig_syms_re))\>'		\
 	  $(_sc_header_without_use)
 
+# Prohibit the inclusion of strings.h without a sensible use.
+# Using the likes of bcmp, bcopy, bzero, index or rindex is not sensible.
+sc_prohibit_strings_without_use:
+	@h='<strings.h>'						\
+	re='\<(strn?casecmp|ffs(ll)?)\>'				\
+	  $(_sc_header_without_use)
+
 # Get the list of symbol names with this:
 # perl -lne '/^# *define (\w+)\(/ and print $1' lib/intprops.h|grep -v '^s'|fmt
 _intprops_names =							\