gnulib: import ffs

The Blackfin sim uses this function, but Windows/mingw doesn't provide it.

13 files changed, 580 insertions, 22 deletions

diff --git a/gnulib/ChangeLog b/gnulib/ChangeLog
index 13cd518940e..1563e04119b 100644
--- a/gnulib/ChangeLog
+++ b/gnulib/ChangeLog
@@ -1,3 +1,12 @@
+2021-05-24  Mike Frysinger  <vapier@gentoo.org>
+
+	* update-gnulib.sh (IMPORTED_GNULIB_MODULES): Add ffs.
+	* aclocal.m4, configure, Makefile.in, import/Makefile.am,
+	import/Makefile.in, import/m4/gnulib-cache.m4,
+	import/m4/gnulib-comp.m4: Regenerate.
+	* import/ffs.c, import/m4/ffs.m4, import/m4/strings_h.m4,
+	import/strings.in.h: New files.
+
 2021-05-04  Mike Frysinger  <vapier@gentoo.org>
 
 	* update-gnulib.sh (IMPORTED_GNULIB_MODULES): Add gendocs.
diff --git a/gnulib/Makefile.in b/gnulib/Makefile.in
index b6439515a40..4c46e0a99e7 100644
--- a/gnulib/Makefile.in
+++ b/gnulib/Makefile.in
@@ -145,6 +145,7 @@ am__aclocal_m4_deps = $(top_srcdir)/../config/depstand.m4 \
 	$(top_srcdir)/import/m4/fcntl.m4 \
 	$(top_srcdir)/import/m4/fcntl_h.m4 \
 	$(top_srcdir)/import/m4/fdopendir.m4 \
+	$(top_srcdir)/import/m4/ffs.m4 \
 	$(top_srcdir)/import/m4/filenamecat.m4 \
 	$(top_srcdir)/import/m4/flexmember.m4 \
 	$(top_srcdir)/import/m4/float_h.m4 \
@@ -248,6 +249,7 @@ am__aclocal_m4_deps = $(top_srcdir)/../config/depstand.m4 \
 	$(top_srcdir)/import/m4/strerror.m4 \
 	$(top_srcdir)/import/m4/strerror_r.m4 \
 	$(top_srcdir)/import/m4/string_h.m4 \
+	$(top_srcdir)/import/m4/strings_h.m4 \
 	$(top_srcdir)/import/m4/strnlen.m4 \
 	$(top_srcdir)/import/m4/strstr.m4 \
 	$(top_srcdir)/import/m4/strtok_r.m4 \
@@ -454,6 +456,7 @@ GNULIB_FDATASYNC = @GNULIB_FDATASYNC@
 GNULIB_FDOPEN = @GNULIB_FDOPEN@
 GNULIB_FDOPENDIR = @GNULIB_FDOPENDIR@
 GNULIB_FFLUSH = @GNULIB_FFLUSH@
+GNULIB_FFS = @GNULIB_FFS@
 GNULIB_FFSL = @GNULIB_FFSL@
 GNULIB_FFSLL = @GNULIB_FFSLL@
 GNULIB_FGETC = @GNULIB_FGETC@
@@ -938,6 +941,7 @@ HAVE_DECL_SNPRINTF = @HAVE_DECL_SNPRINTF@
 HAVE_DECL_SQRTL = @HAVE_DECL_SQRTL@
 HAVE_DECL_STRDUP = @HAVE_DECL_STRDUP@
 HAVE_DECL_STRERROR_R = @HAVE_DECL_STRERROR_R@
+HAVE_DECL_STRNCASECMP = @HAVE_DECL_STRNCASECMP@
 HAVE_DECL_STRNDUP = @HAVE_DECL_STRNDUP@
 HAVE_DECL_STRNLEN = @HAVE_DECL_STRNLEN@
 HAVE_DECL_STRSIGNAL = @HAVE_DECL_STRSIGNAL@
@@ -976,6 +980,7 @@ HAVE_FCNTL = @HAVE_FCNTL@
 HAVE_FDATASYNC = @HAVE_FDATASYNC@
 HAVE_FDOPENDIR = @HAVE_FDOPENDIR@
 HAVE_FEATURES_H = @HAVE_FEATURES_H@
+HAVE_FFS = @HAVE_FFS@
 HAVE_FFSL = @HAVE_FFSL@
 HAVE_FFSLL = @HAVE_FFSLL@
 HAVE_FMA = @HAVE_FMA@
@@ -1122,9 +1127,11 @@ HAVE_SQRTL = @HAVE_SQRTL@
 HAVE_STDINT_H = @HAVE_STDINT_H@
 HAVE_STPCPY = @HAVE_STPCPY@
 HAVE_STPNCPY = @HAVE_STPNCPY@
+HAVE_STRCASECMP = @HAVE_STRCASECMP@
 HAVE_STRCASESTR = @HAVE_STRCASESTR@
 HAVE_STRCHRNUL = @HAVE_STRCHRNUL@
 HAVE_STRERRORNAME_NP = @HAVE_STRERRORNAME_NP@
+HAVE_STRINGS_H = @HAVE_STRINGS_H@
 HAVE_STRPBRK = @HAVE_STRPBRK@
 HAVE_STRPTIME = @HAVE_STRPTIME@
 HAVE_STRSEP = @HAVE_STRSEP@
@@ -1271,6 +1278,7 @@ NEXT_AS_FIRST_DIRECTIVE_STDDEF_H = @NEXT_AS_FIRST_DIRECTIVE_STDDEF_H@
 NEXT_AS_FIRST_DIRECTIVE_STDINT_H = @NEXT_AS_FIRST_DIRECTIVE_STDINT_H@
 NEXT_AS_FIRST_DIRECTIVE_STDIO_H = @NEXT_AS_FIRST_DIRECTIVE_STDIO_H@
 NEXT_AS_FIRST_DIRECTIVE_STDLIB_H = @NEXT_AS_FIRST_DIRECTIVE_STDLIB_H@
+NEXT_AS_FIRST_DIRECTIVE_STRINGS_H = @NEXT_AS_FIRST_DIRECTIVE_STRINGS_H@
 NEXT_AS_FIRST_DIRECTIVE_STRING_H = @NEXT_AS_FIRST_DIRECTIVE_STRING_H@
 NEXT_AS_FIRST_DIRECTIVE_SYS_RANDOM_H = @NEXT_AS_FIRST_DIRECTIVE_SYS_RANDOM_H@
 NEXT_AS_FIRST_DIRECTIVE_SYS_SOCKET_H = @NEXT_AS_FIRST_DIRECTIVE_SYS_SOCKET_H@
@@ -1299,6 +1307,7 @@ NEXT_STDDEF_H = @NEXT_STDDEF_H@
 NEXT_STDINT_H = @NEXT_STDINT_H@
 NEXT_STDIO_H = @NEXT_STDIO_H@
 NEXT_STDLIB_H = @NEXT_STDLIB_H@
+NEXT_STRINGS_H = @NEXT_STRINGS_H@
 NEXT_STRING_H = @NEXT_STRING_H@
 NEXT_SYS_RANDOM_H = @NEXT_SYS_RANDOM_H@
 NEXT_SYS_SOCKET_H = @NEXT_SYS_SOCKET_H@
diff --git a/gnulib/aclocal.m4 b/gnulib/aclocal.m4
index 50c77599a7a..00a0c9c0d95 100644
--- a/gnulib/aclocal.m4
+++ b/gnulib/aclocal.m4
@@ -1218,6 +1218,7 @@ m4_include([import/m4/fcntl-o.m4])
 m4_include([import/m4/fcntl.m4])
 m4_include([import/m4/fcntl_h.m4])
 m4_include([import/m4/fdopendir.m4])
+m4_include([import/m4/ffs.m4])
 m4_include([import/m4/filenamecat.m4])
 m4_include([import/m4/flexmember.m4])
 m4_include([import/m4/float_h.m4])
@@ -1321,6 +1322,7 @@ m4_include([import/m4/strdup.m4])
 m4_include([import/m4/strerror.m4])
 m4_include([import/m4/strerror_r.m4])
 m4_include([import/m4/string_h.m4])
+m4_include([import/m4/strings_h.m4])
 m4_include([import/m4/strnlen.m4])
 m4_include([import/m4/strstr.m4])
 m4_include([import/m4/strtok_r.m4])
diff --git a/gnulib/configure b/gnulib/configure
index ad2315d94d3..2ddb1d7cbb0 100644
--- a/gnulib/configure
+++ b/gnulib/configure
@@ -742,6 +742,9 @@ NEXT_SYS_TYPES_H
 HAVE_SYS_RANDOM_H
 NEXT_AS_FIRST_DIRECTIVE_SYS_RANDOM_H
 NEXT_SYS_RANDOM_H
+HAVE_STRINGS_H
+NEXT_AS_FIRST_DIRECTIVE_STRINGS_H
+NEXT_STRINGS_H
 NEXT_AS_FIRST_DIRECTIVE_STRING_H
 NEXT_STRING_H
 NEXT_AS_FIRST_DIRECTIVE_STDLIB_H
@@ -1455,6 +1458,10 @@ GL_GENERATE_FLOAT_H_TRUE
 FLOAT_H
 NEXT_AS_FIRST_DIRECTIVE_FLOAT_H
 NEXT_FLOAT_H
+HAVE_DECL_STRNCASECMP
+HAVE_STRCASECMP
+HAVE_FFS
+GNULIB_FFS
 NEXT_AS_FIRST_DIRECTIVE_FCNTL_H
 NEXT_FCNTL_H
 REPLACE_OPENAT
@@ -3768,6 +3775,7 @@ as_fn_append ac_func_list " strerror_r"
 as_fn_append ac_func_list " __xpg_strerror_r"
 as_fn_append ac_func_list " catgets"
 as_fn_append ac_func_list " snprintf"
+as_fn_append ac_header_list " strings.h"
 as_fn_append ac_header_list " sys/random.h"
 as_fn_append ac_header_list " sys/uio.h"
 as_fn_append ac_func_list " localtime_r"
@@ -6704,6 +6712,7 @@ fi
   # Code from module fd-hook:
   # Code from module fd-safer-flag:
   # Code from module fdopendir:
+  # Code from module ffs:
   # Code from module filename:
   # Code from module filenamecat-lgpl:
   # Code from module flexmember:
@@ -6814,6 +6823,7 @@ fi
   # Code from module strerror-override:
   # Code from module strerror_r-posix:
   # Code from module string:
+  # Code from module strings:
   # Code from module strnlen:
   # Code from module strnlen1:
   # Code from module strstr:
@@ -9128,6 +9138,12 @@ fi
 
 
 
+  GNULIB_FFS=0;
+    HAVE_FFS=1;
+  HAVE_STRCASECMP=1;
+  HAVE_DECL_STRNCASECMP=1;
+
+
 
 
   GNULIB_FNMATCH=0;
@@ -16700,6 +16716,100 @@ $as_echo "$gl_cv_next_string_h" >&6; }
 
 
 
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+     if test $gl_cv_have_include_next = yes; then
+       gl_cv_next_strings_h='<'strings.h'>'
+     else
+       { $as_echo "$as_me:${as_lineno-$LINENO}: checking absolute name of <strings.h>" >&5
+$as_echo_n "checking absolute name of <strings.h>... " >&6; }
+if ${gl_cv_next_strings_h+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+
+             if test $ac_cv_header_strings_h = yes; then
+
+
+
+
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <strings.h>
+_ACEOF
+                case "$host_os" in
+    aix*) gl_absname_cpp="$ac_cpp -C" ;;
+    *)    gl_absname_cpp="$ac_cpp" ;;
+  esac
+
+  case "$host_os" in
+    mingw*)
+                                          gl_dirsep_regex='[/\\]'
+      ;;
+    *)
+      gl_dirsep_regex='\/'
+      ;;
+  esac
+      gl_make_literal_regex_sed='s,[]$^\\.*/[],\\&,g'
+  gl_header_literal_regex=`echo 'strings.h' \
+                           | sed -e "$gl_make_literal_regex_sed"`
+  gl_absolute_header_sed="/${gl_dirsep_regex}${gl_header_literal_regex}/"'{
+      s/.*"\(.*'"${gl_dirsep_regex}${gl_header_literal_regex}"'\)".*/\1/
+      s|^/[^/]|//&|
+      p
+      q
+    }'
+
+        gl_cv_absolute_strings_h=`(eval "$gl_absname_cpp conftest.$ac_ext") 2>&5 |
+  sed -n "$gl_absolute_header_sed"`
+
+           gl_header=$gl_cv_absolute_strings_h
+           gl_cv_next_strings_h='"'$gl_header'"'
+          else
+               gl_cv_next_strings_h='<'strings.h'>'
+             fi
+
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $gl_cv_next_strings_h" >&5
+$as_echo "$gl_cv_next_strings_h" >&6; }
+     fi
+     NEXT_STRINGS_H=$gl_cv_next_strings_h
+
+     if test $gl_cv_have_include_next = yes || test $gl_cv_have_include_next = buggy; then
+       # INCLUDE_NEXT_AS_FIRST_DIRECTIVE='include_next'
+       gl_next_as_first_directive='<'strings.h'>'
+     else
+       # INCLUDE_NEXT_AS_FIRST_DIRECTIVE='include'
+       gl_next_as_first_directive=$gl_cv_next_strings_h
+     fi
+     NEXT_AS_FIRST_DIRECTIVE_STRINGS_H=$gl_next_as_first_directive
+
+
+
+
+  if test $ac_cv_header_strings_h = yes; then
+    HAVE_STRINGS_H=1
+  else
+    HAVE_STRINGS_H=0
+  fi
+
+
+
+
+
+
 ac_fn_c_check_decl "$LINENO" "strnlen" "ac_cv_have_decl_strnlen" "$ac_includes_default"
 if test "x$ac_cv_have_decl_strnlen" = xyes; then :
   ac_have_decl=1
@@ -19360,6 +19470,67 @@ _ACEOF
 
 
 
+            { $as_echo "$as_me:${as_lineno-$LINENO}: checking for ffs" >&5
+$as_echo_n "checking for ffs... " >&6; }
+if ${gl_cv_func_ffs+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <strings.h>
+            int x;
+
+int
+main ()
+{
+int (*func) (int) = ffs;
+            return func (x);
+
+  ;
+  return 0;
+}
+
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  gl_cv_func_ffs=yes
+else
+  gl_cv_func_ffs=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $gl_cv_func_ffs" >&5
+$as_echo "$gl_cv_func_ffs" >&6; }
+  if test $gl_cv_func_ffs = no; then
+    HAVE_FFS=0
+  fi
+
+  if test $HAVE_FFS = 0; then
+
+
+
+
+
+
+
+
+  gl_LIBOBJS="$gl_LIBOBJS ffs.$ac_objext"
+
+  fi
+
+
+
+
+
+          GNULIB_FFS=1
+
+
+
+
+
+
+
 
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for flexible array member" >&5
 $as_echo_n "checking for flexible array member... " >&6; }
@@ -28740,6 +28911,9 @@ _ACEOF
 
 
 
+
+
+
   if test $ac_cv_have_decl_strnlen = no; then
     HAVE_DECL_STRNLEN=0
   else
diff --git a/gnulib/import/Makefile.am b/gnulib/import/Makefile.am
index bfa30c16806..e99adab7a22 100644
--- a/gnulib/import/Makefile.am
+++ b/gnulib/import/Makefile.am
@@ -39,6 +39,7 @@
 #  dirent \
 #  dirfd \
 #  errno \
+#  ffs \
 #  fnmatch-gnu \
 #  frexpl \
 #  gendocs \
@@ -518,6 +519,15 @@ EXTRA_libgnu_a_SOURCES += fdopendir.c
 
 ## end   gnulib module fdopendir
 
+## begin gnulib module ffs
+
+
+EXTRA_DIST += ffs.c
+
+EXTRA_libgnu_a_SOURCES += ffs.c
+
+## end   gnulib module ffs
+
 ## begin gnulib module filename
 
 
@@ -2331,6 +2341,37 @@ EXTRA_DIST += string.in.h
 
 ## end   gnulib module string
 
+## begin gnulib module strings
+
+BUILT_SOURCES += strings.h
+
+# We need the following in order to create <strings.h> when the system
+# doesn't have one that works with the given compiler.
+strings.h: strings.in.h $(top_builddir)/config.status $(CXXDEFS_H) $(WARN_ON_USE_H) $(ARG_NONNULL_H)
+	$(AM_V_GEN)rm -f $@-t $@ && \
+	{ echo '/* DO NOT EDIT! GENERATED AUTOMATICALLY! */' && \
+	  sed -e 's|@''GUARD_PREFIX''@|GL|g' \
+	      -e 's|@''HAVE_STRINGS_H''@|$(HAVE_STRINGS_H)|g' \
+	      -e 's|@''INCLUDE_NEXT''@|$(INCLUDE_NEXT)|g' \
+	      -e 's|@''PRAGMA_SYSTEM_HEADER''@|@PRAGMA_SYSTEM_HEADER@|g' \
+	      -e 's|@''PRAGMA_COLUMNS''@|@PRAGMA_COLUMNS@|g' \
+	      -e 's|@''NEXT_STRINGS_H''@|$(NEXT_STRINGS_H)|g' \
+	      -e 's/@''GNULIB_FFS''@/$(GNULIB_FFS)/g' \
+	      -e 's|@''HAVE_FFS''@|$(HAVE_FFS)|g' \
+	      -e 's|@''HAVE_STRCASECMP''@|$(HAVE_STRCASECMP)|g' \
+	      -e 's|@''HAVE_DECL_STRNCASECMP''@|$(HAVE_DECL_STRNCASECMP)|g' \
+	      -e '/definitions of _GL_FUNCDECL_RPL/r $(CXXDEFS_H)' \
+	      -e '/definition of _GL_ARG_NONNULL/r $(ARG_NONNULL_H)' \
+	      -e '/definition of _GL_WARN_ON_USE/r $(WARN_ON_USE_H)' \
+	      < $(srcdir)/strings.in.h; \
+	} > $@-t && \
+	mv $@-t $@
+MOSTLYCLEANFILES += strings.h strings.h-t
+
+EXTRA_DIST += strings.in.h
+
+## end   gnulib module strings
+
 ## begin gnulib module strnlen
 
 
diff --git a/gnulib/import/Makefile.in b/gnulib/import/Makefile.in
index 4610d388edd..e02adc633ea 100644
--- a/gnulib/import/Makefile.in
+++ b/gnulib/import/Makefile.in
@@ -53,6 +53,7 @@
 #  dirent \
 #  dirfd \
 #  errno \
+#  ffs \
 #  fnmatch-gnu \
 #  frexpl \
 #  gendocs \
@@ -205,6 +206,7 @@ am__aclocal_m4_deps = $(top_srcdir)/../config/depstand.m4 \
 	$(top_srcdir)/import/m4/fcntl.m4 \
 	$(top_srcdir)/import/m4/fcntl_h.m4 \
 	$(top_srcdir)/import/m4/fdopendir.m4 \
+	$(top_srcdir)/import/m4/ffs.m4 \
 	$(top_srcdir)/import/m4/filenamecat.m4 \
 	$(top_srcdir)/import/m4/flexmember.m4 \
 	$(top_srcdir)/import/m4/float_h.m4 \
@@ -308,6 +310,7 @@ am__aclocal_m4_deps = $(top_srcdir)/../config/depstand.m4 \
 	$(top_srcdir)/import/m4/strerror.m4 \
 	$(top_srcdir)/import/m4/strerror_r.m4 \
 	$(top_srcdir)/import/m4/string_h.m4 \
+	$(top_srcdir)/import/m4/strings_h.m4 \
 	$(top_srcdir)/import/m4/strnlen.m4 \
 	$(top_srcdir)/import/m4/strstr.m4 \
 	$(top_srcdir)/import/m4/strtok_r.m4 \
@@ -552,6 +555,7 @@ GNULIB_FDATASYNC = @GNULIB_FDATASYNC@
 GNULIB_FDOPEN = @GNULIB_FDOPEN@
 GNULIB_FDOPENDIR = @GNULIB_FDOPENDIR@
 GNULIB_FFLUSH = @GNULIB_FFLUSH@
+GNULIB_FFS = @GNULIB_FFS@
 GNULIB_FFSL = @GNULIB_FFSL@
 GNULIB_FFSLL = @GNULIB_FFSLL@
 GNULIB_FGETC = @GNULIB_FGETC@
@@ -1036,6 +1040,7 @@ HAVE_DECL_SNPRINTF = @HAVE_DECL_SNPRINTF@
 HAVE_DECL_SQRTL = @HAVE_DECL_SQRTL@
 HAVE_DECL_STRDUP = @HAVE_DECL_STRDUP@
 HAVE_DECL_STRERROR_R = @HAVE_DECL_STRERROR_R@
+HAVE_DECL_STRNCASECMP = @HAVE_DECL_STRNCASECMP@
 HAVE_DECL_STRNDUP = @HAVE_DECL_STRNDUP@
 HAVE_DECL_STRNLEN = @HAVE_DECL_STRNLEN@
 HAVE_DECL_STRSIGNAL = @HAVE_DECL_STRSIGNAL@
@@ -1074,6 +1079,7 @@ HAVE_FCNTL = @HAVE_FCNTL@
 HAVE_FDATASYNC = @HAVE_FDATASYNC@
 HAVE_FDOPENDIR = @HAVE_FDOPENDIR@
 HAVE_FEATURES_H = @HAVE_FEATURES_H@
+HAVE_FFS = @HAVE_FFS@
 HAVE_FFSL = @HAVE_FFSL@
 HAVE_FFSLL = @HAVE_FFSLL@
 HAVE_FMA = @HAVE_FMA@
@@ -1220,9 +1226,11 @@ HAVE_SQRTL = @HAVE_SQRTL@
 HAVE_STDINT_H = @HAVE_STDINT_H@
 HAVE_STPCPY = @HAVE_STPCPY@
 HAVE_STPNCPY = @HAVE_STPNCPY@
+HAVE_STRCASECMP = @HAVE_STRCASECMP@
 HAVE_STRCASESTR = @HAVE_STRCASESTR@
 HAVE_STRCHRNUL = @HAVE_STRCHRNUL@
 HAVE_STRERRORNAME_NP = @HAVE_STRERRORNAME_NP@
+HAVE_STRINGS_H = @HAVE_STRINGS_H@
 HAVE_STRPBRK = @HAVE_STRPBRK@
 HAVE_STRPTIME = @HAVE_STRPTIME@
 HAVE_STRSEP = @HAVE_STRSEP@
@@ -1369,6 +1377,7 @@ NEXT_AS_FIRST_DIRECTIVE_STDDEF_H = @NEXT_AS_FIRST_DIRECTIVE_STDDEF_H@
 NEXT_AS_FIRST_DIRECTIVE_STDINT_H = @NEXT_AS_FIRST_DIRECTIVE_STDINT_H@
 NEXT_AS_FIRST_DIRECTIVE_STDIO_H = @NEXT_AS_FIRST_DIRECTIVE_STDIO_H@
 NEXT_AS_FIRST_DIRECTIVE_STDLIB_H = @NEXT_AS_FIRST_DIRECTIVE_STDLIB_H@
+NEXT_AS_FIRST_DIRECTIVE_STRINGS_H = @NEXT_AS_FIRST_DIRECTIVE_STRINGS_H@
 NEXT_AS_FIRST_DIRECTIVE_STRING_H = @NEXT_AS_FIRST_DIRECTIVE_STRING_H@
 NEXT_AS_FIRST_DIRECTIVE_SYS_RANDOM_H = @NEXT_AS_FIRST_DIRECTIVE_SYS_RANDOM_H@
 NEXT_AS_FIRST_DIRECTIVE_SYS_SOCKET_H = @NEXT_AS_FIRST_DIRECTIVE_SYS_SOCKET_H@
@@ -1397,6 +1406,7 @@ NEXT_STDDEF_H = @NEXT_STDDEF_H@
 NEXT_STDINT_H = @NEXT_STDINT_H@
 NEXT_STDIO_H = @NEXT_STDIO_H@
 NEXT_STDLIB_H = @NEXT_STDLIB_H@
+NEXT_STRINGS_H = @NEXT_STRINGS_H@
 NEXT_STRING_H = @NEXT_STRING_H@
 NEXT_SYS_RANDOM_H = @NEXT_SYS_RANDOM_H@
 NEXT_SYS_SOCKET_H = @NEXT_SYS_SOCKET_H@
@@ -1781,15 +1791,15 @@ EXTRA_DIST = m4/gnulib-cache.m4 alloca.c alloca.in.h arpa_inet.in.h \
 	close.c closedir.c dirent-private.h count-one-bits.h \
 	ctype.in.h dirent.in.h dirfd.c dirname.h dup.c dup2.c \
 	eloop-threshold.h errno.in.h error.c error.h exitfail.h \
-	fchdir.c fcntl.c fcntl.in.h fd-hook.h fdopendir.c filename.h \
-	filenamecat.h flexmember.h float.c float.in.h itold.c \
-	fnmatch.c fnmatch_loop.c fnmatch.c fnmatch.in.h fpucw.h free.c \
-	frexp.c frexp.c frexpl.c fstat.c stat-w32.c stat-w32.h \
-	at-func.c fstatat.c $(top_srcdir)/import/extra/gendocs.sh \
-	getcwd.c getcwd-lgpl.c getdelim.c getdtablesize.c getline.c \
-	getlogin_r.c getrandom.c gettimeofday.c \
-	$(top_srcdir)/import/extra/gitlog-to-changelog glob.c \
-	glob_internal.h glob_pattern_p.c globfree.c glob-libc.h \
+	fchdir.c fcntl.c fcntl.in.h fd-hook.h fdopendir.c ffs.c \
+	filename.h filenamecat.h flexmember.h float.c float.in.h \
+	itold.c fnmatch.c fnmatch_loop.c fnmatch.c fnmatch.in.h \
+	fpucw.h free.c frexp.c frexp.c frexpl.c fstat.c stat-w32.c \
+	stat-w32.h at-func.c fstatat.c \
+	$(top_srcdir)/import/extra/gendocs.sh getcwd.c getcwd-lgpl.c \
+	getdelim.c getdtablesize.c getline.c getlogin_r.c getrandom.c \
+	gettimeofday.c $(top_srcdir)/import/extra/gitlog-to-changelog \
+	glob.c glob_internal.h glob_pattern_p.c globfree.c glob-libc.h \
 	glob.in.h hard-locale.h inet_ntop.c intprops.h inttypes.in.h \
 	isblank.c float+.h isnan.c isnand-nolibm.h isnand.c float+.h \
 	isnan.c isnanl-nolibm.h isnanl.c cdefs.h libc-config.h \
@@ -1812,11 +1822,11 @@ EXTRA_DIST = m4/gnulib-cache.m4 alloca.c alloca.in.h arpa_inet.in.h \
 	stat-time.h stdalign.in.h stdbool.in.h stddef.in.h stdint.in.h \
 	stdio.in.h stdlib.in.h strchrnul.c strchrnul.valgrind strdup.c \
 	streq.h strerror.c strerror-override.c strerror-override.h \
-	strerror_r.c string.in.h strnlen.c strstr.c str-two-way.h \
-	strstr.c strtok_r.c sys_random.in.h sys_socket.in.h \
-	sys_stat.in.h sys_time.in.h sys_types.in.h sys_uio.in.h \
-	tempname.h time.in.h time_r.c unistd.in.h unistd--.h \
-	unistd-safer.h unsetenv.c \
+	strerror_r.c string.in.h strings.in.h strnlen.c strstr.c \
+	str-two-way.h strstr.c strtok_r.c sys_random.in.h \
+	sys_socket.in.h sys_stat.in.h sys_time.in.h sys_types.in.h \
+	sys_uio.in.h tempname.h time.in.h time_r.c unistd.in.h \
+	unistd--.h unistd-safer.h unsetenv.c \
 	$(top_srcdir)/import/extra/update-copyright verify.h \
 	wchar.in.h wctype.in.h windows-initguard.h windows-mutex.c \
 	windows-mutex.h windows-once.c windows-once.h \
@@ -1827,9 +1837,9 @@ BUILT_SOURCES = $(ALLOCA_H) arpa/inet.h ctype.h dirent.h $(ERRNO_H) \
 	fcntl.h $(FLOAT_H) $(FNMATCH_H) $(GLOB_H) inttypes.h \
 	$(LIMITS_H) locale.h math.h $(NETINET_IN_H) signal.h \
 	$(STDALIGN_H) $(STDBOOL_H) $(STDDEF_H) $(STDINT_H) stdio.h \
-	stdlib.h string.h sys/random.h sys/socket.h sys/stat.h \
-	sys/time.h sys/types.h sys/uio.h time.h unistd.h wchar.h \
-	wctype.h
+	stdlib.h string.h strings.h sys/random.h sys/socket.h \
+	sys/stat.h sys/time.h sys/types.h sys/uio.h time.h unistd.h \
+	wchar.h wctype.h
 SUFFIXES = 
 MOSTLYCLEANFILES = core *.stackdump alloca.h alloca.h-t arpa/inet.h \
 	arpa/inet.h-t ctype.h ctype.h-t dirent.h dirent.h-t errno.h \
@@ -1839,10 +1849,11 @@ MOSTLYCLEANFILES = core *.stackdump alloca.h alloca.h-t arpa/inet.h \
 	netinet/in.h-t signal.h signal.h-t stdalign.h stdalign.h-t \
 	stdbool.h stdbool.h-t stddef.h stddef.h-t stdint.h stdint.h-t \
 	stdio.h stdio.h-t stdlib.h stdlib.h-t string.h string.h-t \
-	sys/random.h sys/random.h-t sys/socket.h sys/socket.h-t \
-	sys/stat.h sys/stat.h-t sys/time.h sys/time.h-t sys/types.h \
-	sys/types.h-t sys/uio.h sys/uio.h-t time.h time.h-t unistd.h \
-	unistd.h-t wchar.h wchar.h-t wctype.h wctype.h-t
+	strings.h strings.h-t sys/random.h sys/random.h-t sys/socket.h \
+	sys/socket.h-t sys/stat.h sys/stat.h-t sys/time.h sys/time.h-t \
+	sys/types.h sys/types.h-t sys/uio.h sys/uio.h-t time.h \
+	time.h-t unistd.h unistd.h-t wchar.h wchar.h-t wctype.h \
+	wctype.h-t
 MOSTLYCLEANDIRS = arpa netinet sys sys sys sys
 CLEANFILES = 
 DISTCLEANFILES = 
@@ -1866,7 +1877,7 @@ libgnu_a_LIBADD = $(gl_LIBOBJS) @ALLOCA@
 libgnu_a_DEPENDENCIES = $(gl_LIBOBJS) @ALLOCA@
 EXTRA_libgnu_a_SOURCES = alloca.c btowc.c canonicalize-lgpl.c \
 	chdir-long.c close.c closedir.c dirfd.c dup.c dup2.c error.c \
-	fchdir.c fcntl.c fdopendir.c float.c itold.c fnmatch.c \
+	fchdir.c fcntl.c fdopendir.c ffs.c float.c itold.c fnmatch.c \
 	fnmatch_loop.c fnmatch.c free.c frexp.c frexp.c frexpl.c \
 	fstat.c stat-w32.c at-func.c fstatat.c getcwd.c getcwd-lgpl.c \
 	getdelim.c getdtablesize.c getline.c getlogin_r.c getrandom.c \
@@ -2017,6 +2028,7 @@ distclean-compile:
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/fd-safer-flag.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/fd-safer.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/fdopendir.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ffs.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/filenamecat-lgpl.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/float.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/fnmatch.Po@am__quote@
@@ -3439,6 +3451,28 @@ string.h: string.in.h $(top_builddir)/config.status $(CXXDEFS_H) $(ARG_NONNULL_H
 	} > $@-t && \
 	mv $@-t $@
 
+# We need the following in order to create <strings.h> when the system
+# doesn't have one that works with the given compiler.
+strings.h: strings.in.h $(top_builddir)/config.status $(CXXDEFS_H) $(WARN_ON_USE_H) $(ARG_NONNULL_H)
+	$(AM_V_GEN)rm -f $@-t $@ && \
+	{ echo '/* DO NOT EDIT! GENERATED AUTOMATICALLY! */' && \
+	  sed -e 's|@''GUARD_PREFIX''@|GL|g' \
+	      -e 's|@''HAVE_STRINGS_H''@|$(HAVE_STRINGS_H)|g' \
+	      -e 's|@''INCLUDE_NEXT''@|$(INCLUDE_NEXT)|g' \
+	      -e 's|@''PRAGMA_SYSTEM_HEADER''@|@PRAGMA_SYSTEM_HEADER@|g' \
+	      -e 's|@''PRAGMA_COLUMNS''@|@PRAGMA_COLUMNS@|g' \
+	      -e 's|@''NEXT_STRINGS_H''@|$(NEXT_STRINGS_H)|g' \
+	      -e 's/@''GNULIB_FFS''@/$(GNULIB_FFS)/g' \
+	      -e 's|@''HAVE_FFS''@|$(HAVE_FFS)|g' \
+	      -e 's|@''HAVE_STRCASECMP''@|$(HAVE_STRCASECMP)|g' \
+	      -e 's|@''HAVE_DECL_STRNCASECMP''@|$(HAVE_DECL_STRNCASECMP)|g' \
+	      -e '/definitions of _GL_FUNCDECL_RPL/r $(CXXDEFS_H)' \
+	      -e '/definition of _GL_ARG_NONNULL/r $(ARG_NONNULL_H)' \
+	      -e '/definition of _GL_WARN_ON_USE/r $(WARN_ON_USE_H)' \
+	      < $(srcdir)/strings.in.h; \
+	} > $@-t && \
+	mv $@-t $@
+
 # We need the following in order to create <sys/random.h> when the system
 # doesn't have one.
 sys/random.h: sys_random.in.h $(top_builddir)/config.status $(CXXDEFS_H) $(ARG_NONNULL_H) $(WARN_ON_USE_H)
diff --git a/gnulib/import/ffs.c b/gnulib/import/ffs.c
new file mode 100644
index 00000000000..68d5d48daf2
--- /dev/null
+++ b/gnulib/import/ffs.c
@@ -0,0 +1,68 @@
+/* ffs.c -- find the first set bit in a word.
+   Copyright (C) 2011-2021 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/>.  */
+
+/* Written by Eric Blake.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include <strings.h>
+
+#include <limits.h>
+
+#if defined _MSC_VER && !(__clang_major__ >= 4)
+# include <intrin.h>
+#endif
+
+int
+ffs (int i)
+{
+#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4) || (__clang_major__ >= 4)
+  return __builtin_ffs (i);
+#elif defined _MSC_VER
+  /* _BitScanForward
+     <https://docs.microsoft.com/en-us/cpp/intrinsics/bitscanforward-bitscanforward64> */
+  unsigned long bit;
+  if (_BitScanForward (&bit, i))
+    return bit + 1;
+  else
+    return 0;
+#else
+  /* <https://github.com/gibsjose/BitHacks>
+     gives this deBruijn constant for a branch-less computation, although
+     that table counted trailing zeros rather than bit position.  This
+     requires 32-bit int, we fall back to a naive algorithm on the rare
+     platforms where that assumption is not true.  */
+  if (CHAR_BIT * sizeof i == 32)
+    {
+      static unsigned int table[] = {
+        1, 2, 29, 3, 30, 15, 25, 4, 31, 23, 21, 16, 26, 18, 5, 9,
+        32, 28, 14, 24, 22, 20, 17, 8, 27, 13, 19, 7, 12, 6, 11, 10
+      };
+      unsigned int u = i;
+      unsigned int bit = u & -u;
+      return table[(bit * 0x077cb531U) >> 27] - !i;
+    }
+  else
+    {
+      unsigned int j;
+      for (j = 0; j < CHAR_BIT * sizeof i; j++)
+        if (i & (1U << j))
+          return j + 1;
+      return 0;
+    }
+#endif
+}
diff --git a/gnulib/import/m4/ffs.m4 b/gnulib/import/m4/ffs.m4
new file mode 100644
index 00000000000..b6e6b3141f3
--- /dev/null
+++ b/gnulib/import/m4/ffs.m4
@@ -0,0 +1,32 @@
+# ffs.m4 serial 4
+dnl Copyright (C) 2011-2021 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_FUNC_FFS],
+[
+  AC_REQUIRE([gl_HEADER_STRINGS_H_DEFAULTS])
+
+  dnl We can't use AC_CHECK_FUNC here, because ffs() is defined as a
+  dnl static inline function when compiling for Android 4.2 or older.
+  dnl But require that ffs() is declared; otherwise we may be using
+  dnl the GCC built-in function, which leads to warnings
+  dnl "warning: implicit declaration of function 'ffs'".
+  AC_CACHE_CHECK([for ffs], [gl_cv_func_ffs],
+    [AC_LINK_IFELSE(
+       [AC_LANG_PROGRAM(
+          [[#include <strings.h>
+            int x;
+          ]],
+          [[int (*func) (int) = ffs;
+            return func (x);
+          ]])
+       ],
+       [gl_cv_func_ffs=yes],
+       [gl_cv_func_ffs=no])
+    ])
+  if test $gl_cv_func_ffs = no; then
+    HAVE_FFS=0
+  fi
+])
diff --git a/gnulib/import/m4/gnulib-cache.m4 b/gnulib/import/m4/gnulib-cache.m4
index 79a2f6107df..ad7db9a694e 100644
--- a/gnulib/import/m4/gnulib-cache.m4
+++ b/gnulib/import/m4/gnulib-cache.m4
@@ -44,6 +44,7 @@
 #  dirent \
 #  dirfd \
 #  errno \
+#  ffs \
 #  fnmatch-gnu \
 #  frexpl \
 #  gendocs \
@@ -88,6 +89,7 @@ gl_MODULES([
   dirent
   dirfd
   errno
+  ffs
   fnmatch-gnu
   frexpl
   gendocs
diff --git a/gnulib/import/m4/gnulib-comp.m4 b/gnulib/import/m4/gnulib-comp.m4
index db323163ee9..75fe076f74e 100644
--- a/gnulib/import/m4/gnulib-comp.m4
+++ b/gnulib/import/m4/gnulib-comp.m4
@@ -84,6 +84,7 @@ AC_DEFUN([gl_EARLY],
   # Code from module fd-hook:
   # Code from module fd-safer-flag:
   # Code from module fdopendir:
+  # Code from module ffs:
   # Code from module filename:
   # Code from module filenamecat-lgpl:
   # Code from module flexmember:
@@ -194,6 +195,7 @@ AC_DEFUN([gl_EARLY],
   # Code from module strerror-override:
   # Code from module strerror_r-posix:
   # Code from module string:
+  # Code from module strings:
   # Code from module strnlen:
   # Code from module strnlen1:
   # Code from module strstr:
@@ -329,6 +331,11 @@ AC_DEFUN([gl_INIT],
   fi
   gl_DIRENT_MODULE_INDICATOR([fdopendir])
   gl_MODULE_INDICATOR([fdopendir])
+  gl_FUNC_FFS
+  if test $HAVE_FFS = 0; then
+    AC_LIBOBJ([ffs])
+  fi
+  gl_STRINGS_MODULE_INDICATOR([ffs])
   gl_FILE_NAME_CONCAT_LGPL
   AC_C_FLEXIBLE_ARRAY_MEMBER
   gl_FLOAT_H
@@ -712,6 +719,7 @@ AC_DEFUN([gl_INIT],
   dnl For the modules argp, error.
   gl_MODULE_INDICATOR([strerror_r-posix])
   gl_HEADER_STRING_H
+  gl_HEADER_STRINGS_H
   gl_FUNC_STRNLEN
   if test $HAVE_DECL_STRNLEN = 0 || test $REPLACE_STRNLEN = 1; then
     AC_LIBOBJ([strnlen])
@@ -990,6 +998,7 @@ AC_DEFUN([gl_FILE_LIST], [
   lib/fd-safer-flag.c
   lib/fd-safer.c
   lib/fdopendir.c
+  lib/ffs.c
   lib/filename.h
   lib/filenamecat-lgpl.c
   lib/filenamecat.h
@@ -1130,6 +1139,7 @@ AC_DEFUN([gl_FILE_LIST], [
   lib/strerror.c
   lib/strerror_r.c
   lib/string.in.h
+  lib/strings.in.h
   lib/stripslash.c
   lib/strnlen.c
   lib/strnlen1.c
@@ -1204,6 +1214,7 @@ AC_DEFUN([gl_FILE_LIST], [
   m4/fcntl.m4
   m4/fcntl_h.m4
   m4/fdopendir.m4
+  m4/ffs.m4
   m4/filenamecat.m4
   m4/flexmember.m4
   m4/float_h.m4
@@ -1306,6 +1317,7 @@ AC_DEFUN([gl_FILE_LIST], [
   m4/strerror.m4
   m4/strerror_r.m4
   m4/string_h.m4
+  m4/strings_h.m4
   m4/strnlen.m4
   m4/strstr.m4
   m4/strtok_r.m4
diff --git a/gnulib/import/m4/strings_h.m4 b/gnulib/import/m4/strings_h.m4
new file mode 100644
index 00000000000..1dc2212ac67
--- /dev/null
+++ b/gnulib/import/m4/strings_h.m4
@@ -0,0 +1,52 @@
+# Configure a replacement for <strings.h>.
+# serial 6
+
+# Copyright (C) 2007, 2009-2021 Free Software Foundation, Inc.
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_HEADER_STRINGS_H],
+[
+  dnl Use AC_REQUIRE here, so that the default behavior below is expanded
+  dnl once only, before all statements that occur in other macros.
+  AC_REQUIRE([gl_HEADER_STRINGS_H_BODY])
+])
+
+AC_DEFUN([gl_HEADER_STRINGS_H_BODY],
+[
+  AC_REQUIRE([gl_HEADER_STRINGS_H_DEFAULTS])
+
+  gl_CHECK_NEXT_HEADERS([strings.h])
+  if test $ac_cv_header_strings_h = yes; then
+    HAVE_STRINGS_H=1
+  else
+    HAVE_STRINGS_H=0
+  fi
+  AC_SUBST([HAVE_STRINGS_H])
+
+  dnl Check for declarations of anything we want to poison if the
+  dnl corresponding gnulib module is not in use.
+  gl_WARN_ON_USE_PREPARE([[
+    /* Minix 3.1.8 has a bug: <sys/types.h> must be included before
+       <strings.h>.  */
+    #include <sys/types.h>
+    #include <strings.h>
+    ]], [ffs strcasecmp strncasecmp])
+])
+
+AC_DEFUN([gl_STRINGS_MODULE_INDICATOR],
+[
+  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
+  AC_REQUIRE([gl_HEADER_STRINGS_H_DEFAULTS])
+  gl_MODULE_INDICATOR_SET_VARIABLE([$1])
+])
+
+AC_DEFUN([gl_HEADER_STRINGS_H_DEFAULTS],
+[
+  GNULIB_FFS=0;            AC_SUBST([GNULIB_FFS])
+  dnl Assume proper GNU behavior unless another module says otherwise.
+  HAVE_FFS=1;              AC_SUBST([HAVE_FFS])
+  HAVE_STRCASECMP=1;       AC_SUBST([HAVE_STRCASECMP])
+  HAVE_DECL_STRNCASECMP=1; AC_SUBST([HAVE_DECL_STRNCASECMP])
+])
diff --git a/gnulib/import/strings.in.h b/gnulib/import/strings.in.h
new file mode 100644
index 00000000000..dbbf94b4d4c
--- /dev/null
+++ b/gnulib/import/strings.in.h
@@ -0,0 +1,122 @@
+/* A substitute <strings.h>.
+
+   Copyright (C) 2007-2021 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, 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/>.  */
+
+#ifndef _@GUARD_PREFIX@_STRINGS_H
+
+#if __GNUC__ >= 3
+@PRAGMA_SYSTEM_HEADER@
+#endif
+@PRAGMA_COLUMNS@
+
+/* Minix 3.1.8 has a bug: <sys/types.h> must be included before <strings.h>.
+   But avoid namespace pollution on glibc systems.  */
+#if defined __minix && !defined __GLIBC__
+# include <sys/types.h>
+#endif
+
+/* The include_next requires a split double-inclusion guard.  */
+#if @HAVE_STRINGS_H@
+# @INCLUDE_NEXT@ @NEXT_STRINGS_H@
+#endif
+
+#ifndef _@GUARD_PREFIX@_STRINGS_H
+#define _@GUARD_PREFIX@_STRINGS_H
+
+#if ! @HAVE_DECL_STRNCASECMP@
+/* Get size_t.  */
+# include <stddef.h>
+#endif
+
+
+/* The definitions of _GL_FUNCDECL_RPL etc. are copied here.  */
+
+/* The definition of _GL_ARG_NONNULL is copied here.  */
+
+/* The definition of _GL_WARN_ON_USE is copied here.  */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+  /* Find the index of the least-significant set bit.  */
+#if @GNULIB_FFS@
+# if !@HAVE_FFS@
+_GL_FUNCDECL_SYS (ffs, int, (int i));
+# endif
+_GL_CXXALIAS_SYS (ffs, int, (int i));
+_GL_CXXALIASWARN (ffs);
+#elif defined GNULIB_POSIXCHECK
+# undef ffs
+# if HAVE_RAW_DECL_FFS
+_GL_WARN_ON_USE (ffs, "ffs is not portable - use the ffs module");
+# endif
+#endif
+
+/* Compare strings S1 and S2, ignoring case, returning less than, equal to or
+   greater than zero if S1 is lexicographically less than, equal to or greater
+   than S2.
+   Note: This function does not work in multibyte locales.  */
+#if ! @HAVE_STRCASECMP@
+extern int strcasecmp (char const *s1, char const *s2)
+     _GL_ARG_NONNULL ((1, 2));
+#endif
+#if defined GNULIB_POSIXCHECK
+/* strcasecmp() does not work with multibyte strings:
+   POSIX says that it operates on "strings", and "string" in POSIX is defined
+   as a sequence of bytes, not of characters.   */
+# undef strcasecmp
+# if HAVE_RAW_DECL_STRCASECMP
+_GL_WARN_ON_USE (strcasecmp, "strcasecmp cannot work correctly on character "
+                 "strings in multibyte locales - "
+                 "use mbscasecmp if you care about "
+                 "internationalization, or use c_strcasecmp , "
+                 "gnulib module c-strcase) if you want a locale "
+                 "independent function");
+# endif
+#endif
+
+/* Compare no more than N bytes of strings S1 and S2, ignoring case,
+   returning less than, equal to or greater than zero if S1 is
+   lexicographically less than, equal to or greater than S2.
+   Note: This function cannot work correctly in multibyte locales.  */
+#if ! @HAVE_DECL_STRNCASECMP@
+extern int strncasecmp (char const *s1, char const *s2, size_t n)
+     _GL_ARG_NONNULL ((1, 2));
+#endif
+#if defined GNULIB_POSIXCHECK
+/* strncasecmp() does not work with multibyte strings:
+   POSIX says that it operates on "strings", and "string" in POSIX is defined
+   as a sequence of bytes, not of characters.  */
+# undef strncasecmp
+# if HAVE_RAW_DECL_STRNCASECMP
+_GL_WARN_ON_USE (strncasecmp, "strncasecmp cannot work correctly on character "
+                 "strings in multibyte locales - "
+                 "use mbsncasecmp or mbspcasecmp if you care about "
+                 "internationalization, or use c_strncasecmp , "
+                 "gnulib module c-strcase) if you want a locale "
+                 "independent function");
+# endif
+#endif
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _@GUARD_PREFIX@_STRING_H */
+#endif /* _@GUARD_PREFIX@_STRING_H */
diff --git a/gnulib/update-gnulib.sh b/gnulib/update-gnulib.sh
index cbe4ee6adfc..e8bb5965269 100755
--- a/gnulib/update-gnulib.sh
+++ b/gnulib/update-gnulib.sh
@@ -36,6 +36,7 @@ IMPORTED_GNULIB_MODULES="\
     dirent \
     dirfd \
     errno \
+    ffs \
     fnmatch-gnu \
     frexpl \
     gendocs \