Update from gnulib

* admin/merge-gnulib (GNULIB_MODULES):
* cross/lib/getopt-pfx-core.h (optind):
* cross/lib/limits.in.h (BOOL_WIDTH):
* cross/lib/math.in.h:
* cross/lib/stpncpy.c (__stpncpy):
* cross/lib/string.in.h:
* lib/getopt-pfx-core.h (optind):
* lib/gnulib.mk.in (ANDROID_MIN_SDK):
(GL_COND_OBJ_STDIO_READ_CONDITION):
(LIBS):
(NDK_BUILD_AR):
(REPLACE__EXIT):
(libgnu_a_SOURCES):
* lib/limits.in.h (BOOL_WIDTH):
* lib/math.in.h:
* lib/stpncpy.c (__stpncpy):
* lib/string.in.h:
* m4/assert_h.m4 (gl_ASSERT_H):
* m4/fdopendir.m4 (gl_FUNC_FDOPENDIR):
* m4/getdelim.m4 (gl_FUNC_GETDELIM):
* m4/getline.m4 (gl_FUNC_GETLINE):
* m4/gnulib-common.m4 (gl_COMMON_BODY):
(gl_CONDITIONAL_HEADER):
(gl_CHECK_FUNCS_ANDROID):
* m4/gnulib-comp.m4 (gl_EARLY):
(gl_INIT):
(gl_FILE_LIST):
* m4/limits-h.m4:
* m4/lstat.m4 (gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK):
* m4/malloc.m4 (_AC_FUNC_MALLOC_IF):
* m4/printf.m4 (gl_PRINTF_SIZES_C99):
(gl_PRINTF_INFINITE):
(gl_PRINTF_INFINITE_LONG_DOUBLE):
(gl_PRINTF_DIRECTIVE_A):
(gl_PRINTF_DIRECTIVE_F):
(gl_PRINTF_FLAG_ZERO):
(gl_SNPRINTF_PRESENCE):
(gl_SNPRINTF_DIRECTIVE_N):
(gl_VSNPRINTF_ZEROSIZE_C99):
* m4/pselect.m4 (gl_FUNC_PSELECT):
* m4/readlink.m4 (gl_FUNC_READLINK):
* m4/realloc.m4 (_AC_FUNC_REALLOC_IF):
* m4/signbit.m4 (gl_SIGNBIT):
* m4/stpncpy.m4 (gl_FUNC_STPNCPY):
* m4/symlink.m4 (gl_FUNC_SYMLINK): Add gnulib module stpncpy.
* src/android.c: Include string.h.

16 files changed, 394 insertions, 101 deletions

diff --git a/m4/assert_h.m4 b/m4/assert_h.m4
index 3801452ef0d..d255855d313 100644
--- a/m4/assert_h.m4
+++ b/m4/assert_h.m4
@@ -46,10 +46,13 @@ AC_DEFUN([gl_ASSERT_H],
        gl_NEXT_HEADERS([assert.h])])
 
   dnl The "zz" puts this toward config.h's end, to avoid potential
-  dnl collisions with other definitions.  #undef assert so that
-  dnl programs are not tempted to use it without specifically
-  dnl including assert.h.  Break the #undef apart with a comment
-  dnl so that 'configure' does not comment it out.
+  dnl collisions with other definitions.
+  dnl #undef assert so that programs are not tempted to use it without
+  dnl specifically including assert.h.
+  dnl #undef __ASSERT_H__ so that on IRIX, when programs later include
+  dnl <assert.h>, this include actually defines assert.
+  dnl Break the #undef_s apart with a comment so that 'configure' does
+  dnl not comment them out.
   AH_VERBATIM([zzstatic_assert],
 [#if (!defined HAVE_C_STATIC_ASSERT && !defined assert \
      && (!defined __cplusplus \
@@ -57,6 +60,9 @@ AC_DEFUN([gl_ASSERT_H],
              && __GNUG__ < 6 && __clang_major__ < 6)))
  #include <assert.h>
  #undef/**/assert
+ #ifdef __sgi
+  #undef/**/__ASSERT_H__
+ #endif
  /* Solaris 11.4 <assert.h> defines static_assert as a macro with 2 arguments.
     We need it also to be invocable with a single argument.  */
  #if defined __sun && (__STDC_VERSION__ - 0 >= 201112L) && !defined __cplusplus
diff --git a/m4/fdopendir.m4 b/m4/fdopendir.m4
index 2c975397118..dfcc46c03e2 100644
--- a/m4/fdopendir.m4
+++ b/m4/fdopendir.m4
@@ -1,4 +1,4 @@
-# serial 14
+# serial 15
 # See if we need to provide fdopendir.
 
 dnl Copyright (C) 2009-2023 Free Software Foundation, Inc.
@@ -49,12 +49,12 @@ DIR *fdopendir (int);
          [gl_cv_func_fdopendir_works=yes],
          [gl_cv_func_fdopendir_works=no],
          [case "$host_os" in
-                     # Guess yes on glibc systems.
-            *-gnu*)  gl_cv_func_fdopendir_works="guessing yes" ;;
-                     # Guess yes on musl systems.
-            *-musl*) gl_cv_func_fdopendir_works="guessing yes" ;;
-                     # If we don't know, obey --enable-cross-guesses.
-            *)       gl_cv_func_fdopendir_works="$gl_cross_guess_normal" ;;
+                                # Guess yes on glibc systems.
+            *-gnu*)             gl_cv_func_fdopendir_works="guessing yes" ;;
+                                # Guess yes on musl systems.
+            *-musl* | midipix*) gl_cv_func_fdopendir_works="guessing yes" ;;
+                                # If we don't know, obey --enable-cross-guesses.
+            *)                  gl_cv_func_fdopendir_works="$gl_cross_guess_normal" ;;
           esac
          ])])
     case "$gl_cv_func_fdopendir_works" in
diff --git a/m4/getdelim.m4 b/m4/getdelim.m4
index d89aae5dffc..60555b9718b 100644
--- a/m4/getdelim.m4
+++ b/m4/getdelim.m4
@@ -1,4 +1,4 @@
-# getdelim.m4 serial 18
+# getdelim.m4 serial 19
 
 dnl Copyright (C) 2005-2007, 2009-2023 Free Software Foundation, Inc.
 dnl
@@ -82,8 +82,8 @@ AC_DEFUN([gl_FUNC_GETDELIM],
                 ],
                 [gl_cv_func_working_getdelim="guessing yes"],
                 [case "$host_os" in
-                   *-musl*) gl_cv_func_working_getdelim="guessing yes" ;;
-                   *)       gl_cv_func_working_getdelim="$gl_cross_guess_normal" ;;
+                   *-musl* | midipix*) gl_cv_func_working_getdelim="guessing yes" ;;
+                   *)                  gl_cv_func_working_getdelim="$gl_cross_guess_normal" ;;
                  esac
                 ])
              ])
diff --git a/m4/getline.m4 b/m4/getline.m4
index 1f2825c3361..83e7e9315f6 100644
--- a/m4/getline.m4
+++ b/m4/getline.m4
@@ -1,4 +1,4 @@
-# getline.m4 serial 32
+# getline.m4 serial 33
 
 dnl Copyright (C) 1998-2003, 2005-2007, 2009-2023 Free Software Foundation,
 dnl Inc.
@@ -76,8 +76,8 @@ AC_DEFUN([gl_FUNC_GETLINE],
             ],
             [am_cv_func_working_getline="guessing yes"],
             [case "$host_os" in
-               *-musl*) am_cv_func_working_getline="guessing yes" ;;
-               *)       am_cv_func_working_getline="$gl_cross_guess_normal" ;;
+               *-musl* | midipix*) am_cv_func_working_getline="guessing yes" ;;
+               *)                  am_cv_func_working_getline="$gl_cross_guess_normal" ;;
              esac
             ])
          ])
diff --git a/m4/gnulib-common.m4 b/m4/gnulib-common.m4
index c0181abdc50..c84a2afd9c5 100644
--- a/m4/gnulib-common.m4
+++ b/m4/gnulib-common.m4
@@ -1,4 +1,4 @@
-# gnulib-common.m4 serial 80
+# gnulib-common.m4 serial 82
 dnl Copyright (C) 2007-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -356,7 +356,7 @@ AC_DEFUN([gl_COMMON_BODY], [
    [[__maybe_unused__]] nevertheless produces a warning.  */
 #ifndef _GL_ATTRIBUTE_MAYBE_UNUSED
 # if defined __clang__ && defined __cplusplus
-#  if __clang_major__ >= 10
+#  if !defined __apple_build_version__ && __clang_major__ >= 10
 #   define _GL_ATTRIBUTE_MAYBE_UNUSED [[__maybe_unused__]]
 #  endif
 # elif defined __has_c_attribute
@@ -1095,6 +1095,113 @@ AC_DEFUN([gl_CONDITIONAL_HEADER],
   m4_popdef([gl_header_name])
 ])
 
+dnl Preparations for gl_CHECK_FUNCS_MACOS.
+AC_DEFUN([gl_PREPARE_CHECK_FUNCS_MACOS],
+[
+  AC_REQUIRE([AC_CANONICAL_HOST])
+  AC_REQUIRE([gl_COMPILER_CLANG])
+  AC_CACHE_CHECK([for compiler option needed when checking for future declarations],
+    [gl_cv_compiler_check_future_option],
+    [case "$host_os" in
+       dnl This is only needed on macOS.
+       darwin*)
+         if test $gl_cv_compiler_clang = yes; then
+           dnl Test whether the compiler supports the option
+           dnl '-Werror=unguarded-availability-new'.
+           save_ac_compile="$ac_compile"
+           ac_compile="$ac_compile -Werror=unguarded-availability-new"
+           AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]],[[]])],
+             [gl_cv_compiler_check_future_option='-Werror=unguarded-availability-new'],
+             [gl_cv_compiler_check_future_option=none])
+           ac_compile="$save_ac_compile"
+         else
+           gl_cv_compiler_check_future_option=none
+         fi
+         ;;
+       *) gl_cv_compiler_check_future_option=none ;;
+     esac
+    ])
+])
+
+dnl Pieces of the expansion of
+dnl gl_CHECK_FUNCS_ANDROID
+dnl gl_CHECK_FUNCS_MACOS
+dnl gl_CHECK_FUNCS_ANDROID_MACOS
+
+AC_DEFUN([gl_CHECK_FUNCS_DEFAULT_CASE],
+[
+         *)
+           AC_CHECK_FUNC([$1])
+           [gl_cv_onwards_func_][$1]=$[ac_cv_func_][$1]
+           ;;
+])
+
+AC_DEFUN([gl_CHECK_FUNCS_CASE_FOR_ANDROID],
+[
+         linux*-android*)
+           AC_CHECK_DECL([$1], , , [$2])
+           if test $[ac_cv_have_decl_][$1] = yes; then
+             AC_CHECK_FUNC([[$1]])
+             if test $[ac_cv_func_][$1] = yes; then
+               [gl_cv_onwards_func_][$1]=yes
+             else
+               dnl The function is declared but does not exist. This should not
+               dnl happen normally. But anyway, we know that a future version
+               dnl of Android will have the function.
+               [gl_cv_onwards_func_][$1]='future OS version'
+             fi
+           else
+             [gl_cv_onwards_func_][$1]='future OS version'
+           fi
+           ;;
+])
+
+AC_DEFUN([gl_CHECK_FUNCS_CASE_FOR_MACOS],
+[
+         darwin*)
+           if test "x$gl_cv_compiler_check_future_option" != "xnone"; then
+             dnl Use a compile test, not a link test.
+             save_ac_compile="$ac_compile"
+             ac_compile="$ac_compile $gl_cv_compiler_check_future_option"
+             save_ac_compile_for_check_decl="$ac_compile_for_check_decl"
+             ac_compile_for_check_decl="$ac_compile_for_check_decl $gl_cv_compiler_check_future_option"
+             unset [ac_cv_have_decl_][$1]
+             AC_CHECK_DECL([$1], , , [$2])
+             ac_compile="$save_ac_compile"
+             ac_compile_for_check_decl="$save_ac_compile_for_check_decl"
+             [ac_cv_func_][$1]="$[ac_cv_have_decl_][$1]"
+             if test $[ac_cv_func_][$1] = yes; then
+               [gl_cv_onwards_func_][$1]=yes
+             else
+               unset [ac_cv_have_decl_][$1]
+               AC_CHECK_DECL([$1], , , [$2])
+               if test $[ac_cv_have_decl_][$1] = yes; then
+                 [gl_cv_onwards_func_][$1]='future OS version'
+               else
+                 [gl_cv_onwards_func_][$1]=no
+               fi
+             fi
+           else
+             AC_CHECK_FUNC([$1])
+             [gl_cv_onwards_func_][$1]=$[ac_cv_func_][$1]
+           fi
+           ;;
+])
+
+AC_DEFUN([gl_CHECK_FUNCS_SET_RESULTS],
+[
+  case "$[gl_cv_onwards_func_][$1]" in
+    future*) [ac_cv_func_][$1]=no ;;
+    *)       [ac_cv_func_][$1]=$[gl_cv_onwards_func_][$1] ;;
+  esac
+  if test $[ac_cv_func_][$1] = yes; then
+    AC_DEFINE([HAVE_]m4_translit([[$1]],
+                                 [abcdefghijklmnopqrstuvwxyz],
+                                 [ABCDEFGHIJKLMNOPQRSTUVWXYZ]),
+              [1], [Define to 1 if you have the `$1' function.])
+  fi
+])
+
 dnl gl_CHECK_FUNCS_ANDROID([func], [[#include <foo.h>]])
 dnl is like AC_CHECK_FUNCS([func]), taking into account a portability problem
 dnl on Android.
@@ -1137,39 +1244,87 @@ AC_DEFUN([gl_CHECK_FUNCS_ANDROID],
     [[gl_cv_onwards_func_][$1]],
     [gl_SILENT([
        case "$host_os" in
-         linux*-android*)
-           AC_CHECK_DECL([$1], , , [$2])
-           if test $[ac_cv_have_decl_][$1] = yes; then
-             AC_CHECK_FUNC([[$1]])
-             if test $[ac_cv_func_][$1] = yes; then
-               [gl_cv_onwards_func_][$1]=yes
-             else
-               dnl The function is declared but does not exist. This should not
-               dnl happen normally. But anyway, we know that a future version
-               dnl of Android will have the function.
-               [gl_cv_onwards_func_][$1]='future OS version'
-             fi
-           else
-             [gl_cv_onwards_func_][$1]='future OS version'
-           fi
-           ;;
-         *)
-           AC_CHECK_FUNC([$1])
-           [gl_cv_onwards_func_][$1]=$[ac_cv_func_][$1]
-           ;;
+         gl_CHECK_FUNCS_CASE_FOR_ANDROID([$1], [$2])
+         gl_CHECK_FUNCS_DEFAULT_CASE([$1])
        esac
       ])
     ])
-  case "$[gl_cv_onwards_func_][$1]" in
-    future*) [ac_cv_func_][$1]=no ;;
-    *)       [ac_cv_func_][$1]=$[gl_cv_onwards_func_][$1] ;;
-  esac
-  if test $[ac_cv_func_][$1] = yes; then
-    AC_DEFINE([HAVE_]m4_translit([[$1]],
-                                 [abcdefghijklmnopqrstuvwxyz],
-                                 [ABCDEFGHIJKLMNOPQRSTUVWXYZ]),
-              [1], [Define to 1 if you have the `$1' function.])
-  fi
+  gl_CHECK_FUNCS_SET_RESULTS([$1])
+])
+
+dnl gl_CHECK_FUNCS_MACOS([func], [[#include <foo.h>]])
+dnl is like AC_CHECK_FUNCS([func]), taking into account a portability problem
+dnl on macOS.
+dnl
+dnl When code is compiled on macOS, it is in the context of a certain minimum
+dnl macOS version, that can be set through the option '-mmacosx-version-min='.
+dnl In other words, you don't compile for a specific version of macOS. You
+dnl compile for all versions of macOS, onwards from the given version.
+dnl Thus, the question "does the OS have the function func" has three possible
+dnl answers:
+dnl   - yes, in all versions starting from the given version,
+dnl   - no, in no version,
+dnl   - not in the given version, but in a later version of macOS.
+dnl
+dnl In detail, this works as follows:
+dnl If func was added to, say, macOS version 13, then the libc has the
+dnl symbol func always, whereas the header file <foo.h> declares func
+dnl conditionally with a special availability attribute:
+dnl   ... func (...) __attribute__((availability(macos,introduced=13.0)));
+dnl Thus, when compiling with "clang mmacosx-version-min=13", there is no
+dnl warning about the use of func, and the resulting binary
+dnl   - runs fine on macOS 13,
+dnl   - aborts with a dyld "Symbol not found" message on macOS 12.
+dnl Whereas, when compiling with "clang mmacosx-version-min=12", there is a
+dnl   warning: 'func' is only available on macOS 13.0 or newer
+dnl   [-Wunguarded-availability-new],
+dnl and the resulting binary
+dnl   - runs fine on macOS 13,
+dnl   - crashes with a SIGSEGV (signal 11) on macOS 12.
+dnl
+dnl This macro sets two variables:
+dnl   - gl_cv_onwards_func_<func>   to yes / no / "future OS version"
+dnl   - ac_cv_func_<func>           to yes / no / no
+dnl The first variable allows to distinguish all three cases.
+dnl The second variable is set, so that an invocation
+dnl   gl_CHECK_FUNCS_MACOS([func], [[#include <foo.h>]])
+dnl can be used as a drop-in replacement for
+dnl   AC_CHECK_FUNCS([func]).
+AC_DEFUN([gl_CHECK_FUNCS_MACOS],
+[
+  AC_REQUIRE([AC_CANONICAL_HOST])
+  AC_REQUIRE([gl_PREPARE_CHECK_FUNCS_MACOS])
+  AC_CACHE_CHECK([for [$1]],
+    [[gl_cv_onwards_func_][$1]],
+    [gl_SILENT([
+       case "$host_os" in
+         gl_CHECK_FUNCS_CASE_FOR_MACOS([$1], [$2])
+         gl_CHECK_FUNCS_DEFAULT_CASE([$1])
+       esac
+      ])
+    ])
+  gl_CHECK_FUNCS_SET_RESULTS([$1])
+])
+
+dnl gl_CHECK_FUNCS_ANDROID_MACOS([func], [[#include <foo.h>]])
+dnl is like AC_CHECK_FUNCS([func]), taking into account a portability problem
+dnl on Android and on macOS.
+dnl It is the combination of gl_CHECK_FUNCS_ANDROID and gl_CHECK_FUNCS_MACOS.
+AC_DEFUN([gl_CHECK_FUNCS_ANDROID_MACOS],
+[
+  AC_REQUIRE([AC_CANONICAL_HOST])
+  AC_REQUIRE([gl_PREPARE_CHECK_FUNCS_MACOS])
+  AC_CACHE_CHECK([for [$1]],
+    [[gl_cv_onwards_func_][$1]],
+    [gl_SILENT([
+       case "$host_os" in
+         gl_CHECK_FUNCS_CASE_FOR_ANDROID([$1], [$2])
+         gl_CHECK_FUNCS_CASE_FOR_MACOS([$1], [$2])
+         gl_CHECK_FUNCS_DEFAULT_CASE([$1])
+       esac
+      ])
+    ])
+  gl_CHECK_FUNCS_SET_RESULTS([$1])
 ])
 
 dnl Expands to some code for use in .c programs that, on native Windows, defines
diff --git a/m4/gnulib-comp.m4 b/m4/gnulib-comp.m4
index 55444bc1450..fa9e589778f 100644
--- a/m4/gnulib-comp.m4
+++ b/m4/gnulib-comp.m4
@@ -195,6 +195,7 @@ AC_DEFUN([gl_EARLY],
   # Code from module stdio:
   # Code from module stdlib:
   # Code from module stpcpy:
+  # Code from module stpncpy:
   # Code from module string:
   # Code from module strnlen:
   # Code from module strtoimax:
@@ -619,6 +620,13 @@ AC_DEFUN([gl_INIT],
     gl_PREREQ_STPCPY
   ])
   gl_STRING_MODULE_INDICATOR([stpcpy])
+  gl_FUNC_STPNCPY
+  gl_CONDITIONAL([GL_COND_OBJ_STPNCPY],
+                 [test $HAVE_STPNCPY = 0 || test $REPLACE_STPNCPY = 1])
+  AM_COND_IF([GL_COND_OBJ_STPNCPY], [
+    gl_PREREQ_STPNCPY
+  ])
+  gl_STRING_MODULE_INDICATOR([stpncpy])
   gl_STRING_H
   gl_STRING_H_REQUIRE_DEFAULTS
   AC_PROG_MKDIR_P
@@ -1587,6 +1595,7 @@ AC_DEFUN([gl_FILE_LIST], [
   lib/stdio.in.h
   lib/stdlib.in.h
   lib/stpcpy.c
+  lib/stpncpy.c
   lib/str-two-way.h
   lib/strftime.h
   lib/string.in.h
@@ -1758,6 +1767,7 @@ AC_DEFUN([gl_FILE_LIST], [
   m4/stdio_h.m4
   m4/stdlib_h.m4
   m4/stpcpy.m4
+  m4/stpncpy.m4
   m4/string_h.m4
   m4/strnlen.m4
   m4/strtoimax.m4
diff --git a/m4/limits-h.m4 b/m4/limits-h.m4
index 5088fa16fd3..4f8ce41098a 100644
--- a/m4/limits-h.m4
+++ b/m4/limits-h.m4
@@ -23,6 +23,7 @@ AC_DEFUN_ONCE([gl_LIMITS_H],
             int wb = WORD_BIT;
             int ullw = ULLONG_WIDTH;
             int bw = BOOL_WIDTH;
+            int bm = BOOL_MAX;
           ]])],
        [gl_cv_header_limits_width=yes],
        [gl_cv_header_limits_width=no])])
diff --git a/m4/lstat.m4 b/m4/lstat.m4
index 7e667fb187a..2bc46697934 100644
--- a/m4/lstat.m4
+++ b/m4/lstat.m4
@@ -1,4 +1,4 @@
-# serial 33
+# serial 34
 
 # Copyright (C) 1997-2001, 2003-2023 Free Software Foundation, Inc.
 #
@@ -56,6 +56,9 @@ AC_DEFUN([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK],
           linux-* | linux)
             # Guess yes on Linux systems.
             gl_cv_func_lstat_dereferences_slashed_symlink="guessing yes" ;;
+          midipix*)
+            # Guess yes on systems that emulate the Linux system calls.
+            gl_cv_func_lstat_dereferences_slashed_symlink="guessing yes" ;;
           *-gnu* | gnu*)
             # Guess yes on glibc systems.
             gl_cv_func_lstat_dereferences_slashed_symlink="guessing yes" ;;
diff --git a/m4/malloc.m4 b/m4/malloc.m4
index 554029243d1..bc580176f5f 100644
--- a/m4/malloc.m4
+++ b/m4/malloc.m4
@@ -1,4 +1,4 @@
-# malloc.m4 serial 28
+# malloc.m4 serial 29
 dnl Copyright (C) 2007, 2009-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -25,7 +25,7 @@ AC_DEFUN([_AC_FUNC_MALLOC_IF],
        [case "$host_os" in
           # Guess yes on platforms where we know the result.
           *-gnu* | freebsd* | netbsd* | openbsd* | bitrig* \
-          | gnu* | *-musl* | midnightbsd* \
+          | gnu* | *-musl* | midipix* | midnightbsd* \
           | hpux* | solaris* | cygwin* | mingw* | msys* )
             ac_cv_func_malloc_0_nonnull="guessing yes" ;;
           # If we don't know, obey --enable-cross-guesses.
diff --git a/m4/printf.m4 b/m4/printf.m4
index 4e65abc6e69..de98a870e98 100644
--- a/m4/printf.m4
+++ b/m4/printf.m4
@@ -1,4 +1,4 @@
-# printf.m4 serial 73
+# printf.m4 serial 74
 dnl Copyright (C) 2003, 2007-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -63,7 +63,7 @@ changequote(,)dnl
                                  # Guess yes on glibc systems.
            *-gnu* | gnu*)        gl_cv_func_printf_sizes_c99="guessing yes";;
                                  # Guess yes on musl systems.
-           *-musl*)              gl_cv_func_printf_sizes_c99="guessing yes";;
+           *-musl* | midipix*)   gl_cv_func_printf_sizes_c99="guessing yes";;
                                  # Guess yes on FreeBSD >= 5.
            freebsd[1-4].*)       gl_cv_func_printf_sizes_c99="guessing no";;
            freebsd* | kfreebsd*) gl_cv_func_printf_sizes_c99="guessing yes";;
@@ -244,7 +244,7 @@ changequote(,)dnl
                                  # Guess yes on glibc systems.
            *-gnu* | gnu*)        gl_cv_func_printf_infinite="guessing yes";;
                                  # Guess yes on musl systems.
-           *-musl*)              gl_cv_func_printf_infinite="guessing yes";;
+           *-musl* | midipix*)   gl_cv_func_printf_infinite="guessing yes";;
                                  # Guess yes on FreeBSD >= 6.
            freebsd[1-5].*)       gl_cv_func_printf_infinite="guessing no";;
            freebsd* | kfreebsd*) gl_cv_func_printf_infinite="guessing yes";;
@@ -467,7 +467,7 @@ changequote(,)dnl
                                          # Guess yes on glibc systems.
                    *-gnu* | gnu*)        gl_cv_func_printf_infinite_long_double="guessing yes";;
                                          # Guess yes on musl systems.
-                   *-musl*)              gl_cv_func_printf_infinite_long_double="guessing yes";;
+                   *-musl* | midipix*)   gl_cv_func_printf_infinite_long_double="guessing yes";;
                                          # Guess yes on FreeBSD >= 6.
                    freebsd[1-5].*)       gl_cv_func_printf_infinite_long_double="guessing no";;
                    freebsd* | kfreebsd*) gl_cv_func_printf_infinite_long_double="guessing yes";;
@@ -591,7 +591,7 @@ int main ()
                [gl_cv_func_printf_directive_a="guessing no"])
              ;;
                                  # Guess yes on musl systems.
-           *-musl*)              gl_cv_func_printf_directive_a="guessing yes";;
+           *-musl* | midipix*)   gl_cv_func_printf_directive_a="guessing yes";;
                                  # Guess no on Android.
            linux*-android*)      gl_cv_func_printf_directive_a="guessing no";;
                                  # Guess no on native Windows.
@@ -643,7 +643,7 @@ changequote(,)dnl
                                  # Guess yes on glibc systems.
            *-gnu* | gnu*)        gl_cv_func_printf_directive_f="guessing yes";;
                                  # Guess yes on musl systems.
-           *-musl*)              gl_cv_func_printf_directive_f="guessing yes";;
+           *-musl* | midipix*)   gl_cv_func_printf_directive_f="guessing yes";;
                                  # Guess yes on FreeBSD >= 6.
            freebsd[1-5].*)       gl_cv_func_printf_directive_f="guessing no";;
            freebsd* | kfreebsd*) gl_cv_func_printf_directive_f="guessing yes";;
@@ -990,18 +990,18 @@ int main ()
         [
 changequote(,)dnl
          case "$host_os" in
-                            # Guess yes on glibc systems.
-           *-gnu* | gnu*)   gl_cv_func_printf_flag_zero="guessing yes";;
-                            # Guess yes on musl systems.
-           *-musl*)         gl_cv_func_printf_flag_zero="guessing yes";;
-                            # Guess yes on BeOS.
-           beos*)           gl_cv_func_printf_flag_zero="guessing yes";;
-                            # Guess no on Android.
-           linux*-android*) gl_cv_func_printf_flag_zero="guessing no";;
-                            # Guess no on native Windows.
-           mingw*)          gl_cv_func_printf_flag_zero="guessing no";;
-                            # If we don't know, obey --enable-cross-guesses.
-           *)               gl_cv_func_printf_flag_zero="$gl_cross_guess_normal";;
+                               # Guess yes on glibc systems.
+           *-gnu* | gnu*)      gl_cv_func_printf_flag_zero="guessing yes";;
+                               # Guess yes on musl systems.
+           *-musl* | midipix*) gl_cv_func_printf_flag_zero="guessing yes";;
+                               # Guess yes on BeOS.
+           beos*)              gl_cv_func_printf_flag_zero="guessing yes";;
+                               # Guess no on Android.
+           linux*-android*)    gl_cv_func_printf_flag_zero="guessing no";;
+                               # Guess no on native Windows.
+           mingw*)             gl_cv_func_printf_flag_zero="guessing no";;
+                               # If we don't know, obey --enable-cross-guesses.
+           *)                  gl_cv_func_printf_flag_zero="$gl_cross_guess_normal";;
          esac
 changequote([,])dnl
         ])
@@ -1239,7 +1239,7 @@ changequote(,)dnl
                                  # Guess yes on glibc systems.
            *-gnu* | gnu*)        gl_cv_func_snprintf_truncation_c99="guessing yes";;
                                  # Guess yes on musl systems.
-           *-musl*)              gl_cv_func_snprintf_truncation_c99="guessing yes";;
+           *-musl* | midipix*)   gl_cv_func_snprintf_truncation_c99="guessing yes";;
                                  # Guess yes on FreeBSD >= 5.
            freebsd[1-4].*)       gl_cv_func_snprintf_truncation_c99="guessing no";;
            freebsd* | kfreebsd*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
@@ -1344,7 +1344,7 @@ changequote(,)dnl
                                  # Guess yes on glibc systems.
            *-gnu* | gnu*)        gl_cv_func_snprintf_retval_c99="guessing yes";;
                                  # Guess yes on musl systems.
-           *-musl*)              gl_cv_func_snprintf_retval_c99="guessing yes";;
+           *-musl* | midipix*)   gl_cv_func_snprintf_retval_c99="guessing yes";;
                                  # Guess yes on FreeBSD >= 5.
            freebsd[1-4].*)       gl_cv_func_snprintf_retval_c99="guessing no";;
            freebsd* | kfreebsd*) gl_cv_func_snprintf_retval_c99="guessing yes";;
@@ -1447,7 +1447,7 @@ int main ()
                                  ;;
 changequote(,)dnl
                                  # Guess yes on musl systems.
-           *-musl*)              gl_cv_func_snprintf_directive_n="guessing yes";;
+           *-musl* | midipix*)   gl_cv_func_snprintf_directive_n="guessing yes";;
                                  # Guess yes on FreeBSD >= 5.
            freebsd[1-4].*)       gl_cv_func_snprintf_directive_n="guessing no";;
            freebsd* | kfreebsd*) gl_cv_func_snprintf_directive_n="guessing yes";;
@@ -1604,7 +1604,7 @@ changequote(,)dnl
                                  # Guess yes on glibc systems.
            *-gnu* | gnu*)        gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
                                  # Guess yes on musl systems.
-           *-musl*)              gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
+           *-musl* | midipix*)   gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
                                  # Guess yes on FreeBSD >= 5.
            freebsd[1-4].*)       gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
            freebsd* | kfreebsd*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
diff --git a/m4/pselect.m4 b/m4/pselect.m4
index 9f2b282cee0..6c3d1b8f97f 100644
--- a/m4/pselect.m4
+++ b/m4/pselect.m4
@@ -1,4 +1,4 @@
-# pselect.m4 serial 10
+# pselect.m4 serial 11
 dnl Copyright (C) 2011-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -54,6 +54,8 @@ AC_DEFUN([gl_FUNC_PSELECT],
            case "$host_os" in
                              # Guess yes on Linux systems.
             linux-* | linux) gl_cv_func_pselect_detects_ebadf="guessing yes" ;;
+                             # Guess yes on systems that emulate the Linux system calls.
+            midipix*)        gl_cv_func_pselect_detects_ebadf="guessing yes" ;;
                              # Guess yes on glibc systems.
             *-gnu* | gnu*)   gl_cv_func_pselect_detects_ebadf="guessing yes" ;;
                              # If we don't know, obey --enable-cross-guesses.
diff --git a/m4/readlink.m4 b/m4/readlink.m4
index 078b93aa9dc..f1d41d2b113 100644
--- a/m4/readlink.m4
+++ b/m4/readlink.m4
@@ -1,4 +1,4 @@
-# readlink.m4 serial 16
+# readlink.m4 serial 17
 dnl Copyright (C) 2003, 2007, 2009-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -38,6 +38,9 @@ AC_DEFUN([gl_FUNC_READLINK],
             # Guess yes on Linux or glibc systems.
             linux-* | linux | *-gnu* | gnu*)
               gl_cv_func_readlink_trailing_slash="guessing yes" ;;
+            # Guess yes on systems that emulate the Linux system calls.
+            midipix*)
+              gl_cv_func_readlink_trailing_slash="guessing yes" ;;
             # Guess no on AIX or HP-UX.
             aix* | hpux*)
               gl_cv_func_readlink_trailing_slash="guessing no" ;;
@@ -75,6 +78,9 @@ AC_DEFUN([gl_FUNC_READLINK],
             # Guess yes on Linux or glibc systems.
             linux-* | linux | *-gnu* | gnu*)
               gl_cv_func_readlink_truncate="guessing yes" ;;
+            # Guess yes on systems that emulate the Linux system calls.
+            midipix*)
+              gl_cv_func_readlink_truncate="guessing yes" ;;
             # Guess no on AIX or HP-UX.
             aix* | hpux*)
               gl_cv_func_readlink_truncate="guessing no" ;;
diff --git a/m4/realloc.m4 b/m4/realloc.m4
index d22138fc7ac..26053914cbe 100644
--- a/m4/realloc.m4
+++ b/m4/realloc.m4
@@ -1,4 +1,4 @@
-# realloc.m4 serial 26
+# realloc.m4 serial 27
 dnl Copyright (C) 2007, 2009-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -25,7 +25,7 @@ AC_DEFUN([_AC_FUNC_REALLOC_IF],
        [case "$host_os" in
           # Guess yes on platforms where we know the result.
           *-gnu* | freebsd* | netbsd* | openbsd* | bitrig* \
-          | gnu* | *-musl* | midnightbsd* \
+          | gnu* | *-musl* | midipix* | midnightbsd* \
           | hpux* | solaris* | cygwin* | mingw* | msys* )
             ac_cv_func_realloc_0_nonnull="guessing yes" ;;
           # If we don't know, obey --enable-cross-guesses.
diff --git a/m4/signbit.m4 b/m4/signbit.m4
index f957884340d..2fea73f854c 100644
--- a/m4/signbit.m4
+++ b/m4/signbit.m4
@@ -1,4 +1,4 @@
-# signbit.m4 serial 20
+# signbit.m4 serial 21
 dnl Copyright (C) 2007-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -29,14 +29,14 @@ AC_DEFUN([gl_SIGNBIT],
         [gl_cv_func_signbit=yes],
         [gl_cv_func_signbit=no],
         [case "$host_os" in
-                          # Guess yes on glibc systems.
-           *-gnu* | gnu*) gl_cv_func_signbit="guessing yes" ;;
-                          # Guess yes on musl systems.
-           *-musl*)       gl_cv_func_signbit="guessing yes" ;;
-                          # Guess yes on native Windows.
-           mingw*)        gl_cv_func_signbit="guessing yes" ;;
-                          # If we don't know, obey --enable-cross-guesses.
-           *)             gl_cv_func_signbit="$gl_cross_guess_normal" ;;
+                               # Guess yes on glibc systems.
+           *-gnu* | gnu*)      gl_cv_func_signbit="guessing yes" ;;
+                               # Guess yes on musl systems.
+           *-musl* | midipix*) gl_cv_func_signbit="guessing yes" ;;
+                               # Guess yes on native Windows.
+           mingw*)             gl_cv_func_signbit="guessing yes" ;;
+                               # If we don't know, obey --enable-cross-guesses.
+           *)                  gl_cv_func_signbit="$gl_cross_guess_normal" ;;
          esac
         ])
     ])
@@ -63,19 +63,19 @@ AC_DEFUN([gl_SIGNBIT],
         [gl_cv_func_signbit_builtins=yes],
         [gl_cv_func_signbit_builtins=no],
         [case "$host_os" in
-                          # Guess yes on glibc systems.
-           *-gnu* | gnu*) gl_cv_func_signbit_builtins="guessing yes" ;;
-                          # Guess yes on musl systems.
-           *-musl*)       gl_cv_func_signbit_builtins="guessing yes" ;;
-                          # Guess yes on mingw, no on MSVC.
-           mingw*)        if test -n "$GCC"; then
-                            gl_cv_func_signbit_builtins="guessing yes"
-                          else
-                            gl_cv_func_signbit_builtins="guessing no"
-                          fi
-                          ;;
-                          # If we don't know, obey --enable-cross-guesses.
-           *)             gl_cv_func_signbit_builtins="$gl_cross_guess_normal" ;;
+                               # Guess yes on glibc systems.
+           *-gnu* | gnu*)      gl_cv_func_signbit_builtins="guessing yes" ;;
+                               # Guess yes on musl systems.
+           *-musl* | midipix*) gl_cv_func_signbit_builtins="guessing yes" ;;
+                               # Guess yes on mingw, no on MSVC.
+           mingw*)             if test -n "$GCC"; then
+                                 gl_cv_func_signbit_builtins="guessing yes"
+                               else
+                                 gl_cv_func_signbit_builtins="guessing no"
+                               fi
+                               ;;
+                               # If we don't know, obey --enable-cross-guesses.
+           *)                  gl_cv_func_signbit_builtins="$gl_cross_guess_normal" ;;
          esac
         ])
     ])
diff --git a/m4/stpncpy.m4 b/m4/stpncpy.m4
new file mode 100644
index 00000000000..073607004be
--- /dev/null
+++ b/m4/stpncpy.m4
@@ -0,0 +1,108 @@
+# stpncpy.m4 serial 22
+dnl Copyright (C) 2002-2003, 2005-2007, 2009-2023 Free Software Foundation,
+dnl 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_STPNCPY],
+[
+  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+
+  dnl Persuade glibc <string.h> to declare stpncpy().
+  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
+  dnl The stpncpy() declaration in lib/string.in.h uses 'restrict'.
+  AC_REQUIRE([AC_C_RESTRICT])
+
+  AC_REQUIRE([gl_STRING_H_DEFAULTS])
+
+  dnl Both glibc and AIX (4.3.3, 5.1) have an stpncpy() function
+  dnl declared in <string.h>. Its side effects are the same as those
+  dnl of strncpy():
+  dnl      stpncpy (dest, src, n)
+  dnl overwrites dest[0..n-1], min(strlen(src),n) bytes coming from src,
+  dnl and the remaining bytes being NULs.  However, the return value is
+  dnl   in glibc:   dest + min(strlen(src),n)
+  dnl   in AIX:     dest + max(0,n-1)
+  dnl Only the glibc return value is useful in practice.
+
+  AC_CHECK_DECLS_ONCE([stpncpy])
+  gl_CHECK_FUNCS_ANDROID([stpncpy], [[#include <string.h>]])
+  if test $ac_cv_func_stpncpy = yes; then
+    AC_CACHE_CHECK([for working stpncpy], [gl_cv_func_stpncpy], [
+      AC_RUN_IFELSE(
+        [AC_LANG_SOURCE([[
+#include <stdlib.h>
+#include <string.h> /* for strcpy */
+/* The stpncpy prototype is missing in <string.h> on AIX 4.  */
+#if !HAVE_DECL_STPNCPY
+extern
+# ifdef __cplusplus
+"C"
+# endif
+char *stpncpy (char *dest, const char *src, size_t n);
+#endif
+int main ()
+{
+  int result = 0;
+  const char *src = "Hello";
+  char dest[10];
+  /* AIX 4.3.3 and AIX 5.1 stpncpy() returns dest+1 here.  */
+  {
+    strcpy (dest, "\377\377\377\377\377\377");
+    if (stpncpy (dest, src, 2) != dest + 2)
+      result |= 1;
+  }
+  /* AIX 4.3.3 and AIX 5.1 stpncpy() returns dest+4 here.  */
+  {
+    strcpy (dest, "\377\377\377\377\377\377");
+    if (stpncpy (dest, src, 5) != dest + 5)
+      result |= 2;
+  }
+  /* AIX 4.3.3 and AIX 5.1 stpncpy() returns dest+6 here.  */
+  {
+    strcpy (dest, "\377\377\377\377\377\377");
+    if (stpncpy (dest, src, 7) != dest + 5)
+      result |= 4;
+  }
+  return result;
+}
+]])],
+        [gl_cv_func_stpncpy=yes],
+        [gl_cv_func_stpncpy=no],
+        [dnl Guess yes on glibc systems and musl systems.
+         AC_EGREP_CPP([Thanks for using GNU], [
+#include <features.h>
+#ifdef __GNU_LIBRARY__
+  Thanks for using GNU
+#endif
+],         [gl_cv_func_stpncpy="guessing yes"],
+           [case "$host_os" in
+              *-musl* | midipix*) gl_cv_func_stpncpy="guessing yes" ;;
+              *)                  gl_cv_func_stpncpy="$gl_cross_guess_normal" ;;
+            esac
+           ])
+        ])
+    ])
+    case "$gl_cv_func_stpncpy" in
+      *yes)
+        AC_DEFINE([HAVE_STPNCPY], [1],
+          [Define if you have the stpncpy() function and it works.])
+        ;;
+      *)
+        REPLACE_STPNCPY=1
+        ;;
+    esac
+  else
+    HAVE_STPNCPY=0
+    case "$gl_cv_onwards_func_stpncpy" in
+      future*) REPLACE_STPNCPY=1 ;;
+    esac
+  fi
+])
+
+# Prerequisites of lib/stpncpy.c.
+AC_DEFUN([gl_PREREQ_STPNCPY], [
+  :
+])
diff --git a/m4/symlink.m4 b/m4/symlink.m4
index 7796ec8bbc0..52d6c115ca5 100644
--- a/m4/symlink.m4
+++ b/m4/symlink.m4
@@ -1,4 +1,4 @@
-# serial 9
+# serial 10
 # See if we need to provide symlink replacement.
 
 dnl Copyright (C) 2009-2023 Free Software Foundation, Inc.
@@ -38,6 +38,8 @@ AC_DEFUN([gl_FUNC_SYMLINK],
          [case "$host_os" in
                              # Guess yes on Linux systems.
             linux-* | linux) gl_cv_func_symlink_works="guessing yes" ;;
+                             # Guess yes on systems that emulate the Linux system calls.
+            midipix*)        gl_cv_func_symlink_works="guessing yes" ;;
                              # Guess yes on glibc systems.
             *-gnu* | gnu*)   gl_cv_func_symlink_works="guessing yes" ;;
                              # If we don't know, obey --enable-cross-guesses.