Fix gnulib-tool error when some modules occur in tests/.

* doc/gnulib.texi (Specification): Update statistics.
(Autoconf macros): Don't suggest to use AC_LIBOBJ in a .m4 file.
(Using AC_LIBOBJ): New section.
* check-AC_LIBOBJ: New file.
* modules/fnmatch-gnu (Files): Add lib/fnmatch.c.
* modules/fopen-gnu (Files): Add lib/fopen.c.
* modules/memmem (Files): Add lib/memmem.c.
* modules/renameat (Files): Add lib/at-func2.c.
* modules/strcasestr (Files): Add lib/strcasestr.c.
* modules/strstr (Files): Add lib/strstr.c.

1 files changed, 32 insertions, 0 deletions

diff --git a/check-AC_LIBOBJ b/check-AC_LIBOBJ
new file mode 100755
index 0000000000..f0c5a074d4
--- /dev/null
+++ b/check-AC_LIBOBJ
@@ -0,0 +1,32 @@
+#!/bin/sh
+#
+# Copyright (C) 2020 Free Software Foundation, Inc.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+#
+
+# Check that all AC_LIBOBJ invocations in module descriptions follow the rules.
+exitcode=0
+for module in `./gnulib-tool --list`; do
+  f=modules/$module
+  for g in `sed -n -e 's/^ *AC_LIBOBJ(\[\(.*\)\]).*/\1/p' < $f`; do
+    if grep "^lib/$g\.c\$" $f >/dev/null; then
+      :
+    else
+      echo "$f lacks file lib/$g.c"
+      exitcode=1
+    fi
+  done
+done
+exit $exitcode