warn-on-use: work with old autoconf

[gnulib.git] / Makefile

diff --git a/Makefile b/Makefile
index acdb23d..d2878d6 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 # Makefile for gnulib central.
-# Copyright (C) 2006, 2009 Free Software Foundation, Inc.
+# Copyright (C) 2006, 2009, 2010 Free Software Foundation, Inc.
 #
 # Copying and distribution of this file, with or without modification,
 # in any medium, are permitted without royalty provided the copyright
@@ -13,7 +13,12 @@ info html dvi pdf:
        cd doc && $(MAKE) $@ && $(MAKE) mostlyclean
 
 # Perform some platform independent checks on the gnulib code.
-check:
+check: sc_prefer_ac_check_funcs_once
+
+sc_prefer_ac_check_funcs_once:
+       git grep -w -l AC_CHECK_FUNCS modules && \
+         { echo use AC_CHECK_FUNCS_ONCE, not AC_CHECK_FUNCS in modules/ 1>&2; \
+           exit 1; } || :
 
 # Regenerate some files that are stored in the repository.
 regen: MODULES.html