Update from Gnulib by running admin/merge-gnulib

lib/filename.h

@@ -49,7 +49,10 @@ extern "C" {
                                any notion of "current directory".
    IS_RELATIVE_FILE_NAME(Filename)
                                tests whether Filename may be concatenated
-                               to a directory filename.
+                               to a directory filename to yield the name
+                               of a file relative to that directory.
+                               Watch out: IS_RELATIVE_FILE_NAME ("") is 1
+                               even though "" is not a relative file name.
    Note: On native Windows, OS/2, DOS, "c:" is neither an absolute nor a
    relative file name!
    IS_FILE_NAME_WITH_DIR(Filename)  tests whether Filename contains a device

lib/stdio-consolesafe.c

@@ -85,7 +85,7 @@ gl_consolesafe_fwrite (const void *ptr, size_t size, size_t nmemb, FILE *fp)
    specifiers as the mingw *printf functions.  */
 
 static int
-vasprintf (char **resultp, const char *format, va_list args)
+local_vasprintf (char **resultp, const char *format, va_list args)
 {
   /* First try: Use a stack-allocated buffer.  */
   char buf[2048];
@@ -123,6 +123,9 @@ vasprintf (char **resultp, const char *format, va_list args)
   return nbytes;
 }
 
+#  undef vasprintf
+#  define vasprintf local_vasprintf
+
 # endif
 
 /* Bypass the functions __mingw_[v][f]printf, that trigger a bug in msvcrt,

m4/getdelim.m4

@@ -1,5 +1,5 @@
 # getdelim.m4
-# serial 21
+# serial 22
 
 dnl Copyright (C) 2005-2007, 2009-2026 Free Software Foundation, Inc.
 dnl
@@ -37,7 +37,6 @@ AC_DEFUN([gl_FUNC_GETDELIM],
            gl_cv_func_working_getdelim=no ;;
          *)
            echo fooNbarN | tr -d '\012' | tr N '\012' > conftest.data
-           touch conftest.empty
            AC_RUN_IFELSE([AC_LANG_SOURCE([[
 #    include <stdio.h>
 #    include <stdlib.h>
@@ -68,36 +67,32 @@ AC_DEFUN([gl_FUNC_GETDELIM],
         free (line);
       }
       fclose (in);
-      {
-        /* Test that reading EOF as the first character sets the first byte
-           in the buffer to NUL.  This fails on glibc 2.42 and earlier.  */
-        in = fopen ("./conftest.empty", "r");
-        if (!in)
-          return 1;
-        char *line = malloc (1);
-        line[0] = 'A';
-        size_t siz = 1;
-        if (getdelim (&line, &siz, '\n', in) != -1 || line[0] != '\0')
-          result |= 8;
-        free (line);
-      }
-      fclose (in);
       return result;
     }
     ]])],
              [gl_cv_func_working_getdelim=yes],
              [gl_cv_func_working_getdelim=no],
-             [case "$host_os" in
+             [dnl We're cross compiling.
-                                    # Guess yes on musl.
+              dnl Guess it works on glibc2 systems and musl systems.
-                *-musl* | midipix*) gl_cv_func_working_getdelim="guessing yes" ;;
+              AC_EGREP_CPP([Lucky GNU user],
-                                    # Guess no on glibc.
+                [
-                *-gnu* | gnu*)      gl_cv_func_working_getdelim="guessing no" ;;
+#include <features.h>
-                *)                  gl_cv_func_working_getdelim="$gl_cross_guess_normal" ;;
+#ifdef __GNU_LIBRARY__
-              esac
+ #if (__GLIBC__ >= 2) && !defined __UCLIBC__
+  Lucky GNU user
+ #endif
+#endif
+                ],
+                [gl_cv_func_working_getdelim="guessing yes"],
+                [case "$host_os" in
+                   *-musl* | midipix*) gl_cv_func_working_getdelim="guessing yes" ;;
+                   *)                  gl_cv_func_working_getdelim="$gl_cross_guess_normal" ;;
+                 esac
+                ])
              ])
            ;;
        esac
-       rm -f conftest.data conftest.empty
+       rm -f conftest.data
       ])
     case "$gl_cv_func_working_getdelim" in
       *yes) ;;

m4/getline.m4

@@ -1,5 +1,5 @@
 # getline.m4
-# serial 35
+# serial 36
 
 dnl Copyright (C) 1998-2003, 2005-2007, 2009-2026 Free Software Foundation,
 dnl Inc.
@@ -31,7 +31,6 @@ AC_DEFUN([gl_FUNC_GETLINE],
     AC_CACHE_CHECK([for working getline function],
       [am_cv_func_working_getline],
       [echo fooNbarN | tr -d '\012' | tr N '\012' > conftest.data
-       touch conftest.empty
        AC_RUN_IFELSE([AC_LANG_SOURCE([[
 #    include <stdio.h>
 #    include <stdlib.h>
@@ -62,34 +61,30 @@ AC_DEFUN([gl_FUNC_GETLINE],
         free (line);
       }
       fclose (in);
-      {
-        /* Test that reading EOF as the first character sets the first byte
-           in the buffer to NUL.  This fails on glibc 2.42 and earlier.  */
-        in = fopen ("./conftest.empty", "r");
-        if (!in)
-          return 1;
-        char *line = malloc (1);
-        line[0] = 'A';
-        size_t siz = 1;
-        if (getline (&line, &siz, in) != -1 || line[0] != '\0')
-          result |= 8;
-        free (line);
-      }
-      fclose (in);
       return result;
     }
     ]])],
          [am_cv_func_working_getline=yes],
          [am_cv_func_working_getline=no],
-         [case "$host_os" in
+         [dnl We're cross compiling.
-                                # Guess yes on musl.
+          dnl Guess it works on glibc2 systems and musl systems.
-            *-musl* | midipix*) am_cv_func_working_getline="guessing yes" ;;
+          AC_EGREP_CPP([Lucky GNU user],
-                                # Guess no on glibc.
+            [
-            *-gnu* | gnu*)      am_cv_func_working_getline="guessing no" ;;
+#include <features.h>
-            *)                  am_cv_func_working_getline="$gl_cross_guess_normal" ;;
+#ifdef __GNU_LIBRARY__
-          esac
+ #if (__GLIBC__ >= 2) && !defined __UCLIBC__
+  Lucky GNU user
+ #endif
+#endif
+            ],
+            [am_cv_func_working_getline="guessing yes"],
+            [case "$host_os" in
+               *-musl* | midipix*) am_cv_func_working_getline="guessing yes" ;;
+               *)                  am_cv_func_working_getline="$gl_cross_guess_normal" ;;
+             esac
+            ])
          ])
-       rm -f conftest.data conftest.empty
+       rm -f conftest.data
       ])
   else
     am_cv_func_working_getline=no

m4/selinux-selinux-h.m4

@@ -1,5 +1,5 @@
 # selinux-selinux-h.m4
-# serial 10   -*- Autoconf -*-
+# serial 12   -*- Autoconf -*-
 dnl Copyright (C) 2006-2007, 2009-2026 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -49,7 +49,7 @@ AC_DEFUN([gl_CHECK_HEADER_SELINUX_SELINUX_H],
       USE_SELINUX_SELINUX_H=0
     fi
 
-    case "$ac_cv_search_setfilecon:$ac_cv_header_selinux_selinux_h" in
+    case "$ac_cv_search_getfilecon_raw:$ac_cv_header_selinux_selinux_h" in
       no:*) # already warned
         ;;
       *:no)
@@ -79,15 +79,17 @@ AC_DEFUN([gl_LIBSELINUX],
   LIB_SELINUX=
   if test "$with_selinux" != no; then
     gl_saved_LIBS=$LIBS
-    AC_SEARCH_LIBS([setfilecon], [selinux],
+    dnl On Android, in Termux, prefer libandroid-selinux.so, because it
-                   [test "$ac_cv_search_setfilecon" = "none required" ||
+    dnl defines many more API functions than /system/lib/libselinux.so.
-                    LIB_SELINUX=$ac_cv_search_setfilecon])
+    AC_SEARCH_LIBS([getfilecon_raw], [android-selinux selinux],
+                   [test "$ac_cv_search_getfilecon_raw" = "none required" ||
+                    LIB_SELINUX=$ac_cv_search_getfilecon_raw])
     LIBS=$gl_saved_LIBS
   fi
   AC_SUBST([LIB_SELINUX])
 
   # Warn if SELinux is found but libselinux is absent;
-  if test "$ac_cv_search_setfilecon" = no; then
+  if test "$ac_cv_search_getfilecon_raw" = no; then
     if test "$host" = "$build" \
        && { test -d /sys/fs/selinux || test -d /selinux; }; then
       AC_MSG_WARN([This system supports SELinux but libselinux is missing.])