1 files changed, 82 insertions, 133 deletions

diff --git a/gl/m4/mbrtowc.m4 b/gl/m4/mbrtowc.m4
index bb393041..a49872fa 100644
--- a/gl/m4/mbrtowc.m4
+++ b/gl/m4/mbrtowc.m4
@@ -1,9 +1,11 @@
-# mbrtowc.m4 serial 38  -*- coding: utf-8 -*-
-dnl Copyright (C) 2001-2002, 2004-2005, 2008-2023 Free Software Foundation,
+# mbrtowc.m4
+# serial 47
+dnl Copyright (C) 2001-2002, 2004-2005, 2008-2026 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.
+dnl This file is offered as-is, without any warranty.
 
 AC_DEFUN([gl_FUNC_MBRTOWC],
 [
@@ -31,7 +33,6 @@ AC_DEFUN([gl_FUNC_MBRTOWC],
       REPLACE_MBRTOWC=1
     else
       gl_MBRTOWC_NULL_ARG1
-      gl_MBRTOWC_NULL_ARG2
       gl_MBRTOWC_RETVAL
       gl_MBRTOWC_NUL_RETVAL
       gl_MBRTOWC_STORES_INCOMPLETE
@@ -44,13 +45,6 @@ AC_DEFUN([gl_FUNC_MBRTOWC],
            REPLACE_MBRTOWC=1
            ;;
       esac
-      case "$gl_cv_func_mbrtowc_null_arg2" in
-        *yes) ;;
-        *) AC_DEFINE([MBRTOWC_NULL_ARG2_BUG], [1],
-             [Define if the mbrtowc function has the NULL string argument bug.])
-           REPLACE_MBRTOWC=1
-           ;;
-      esac
       case "$gl_cv_func_mbrtowc_retval" in
         *yes) ;;
         *) AC_DEFINE([MBRTOWC_RETVAL_BUG], [1],
@@ -91,20 +85,25 @@ AC_DEFUN([gl_FUNC_MBRTOWC],
   fi
   if test $REPLACE_MBSTATE_T = 1; then
     case "$host_os" in
-      mingw*) LIB_MBRTOWC= ;;
+      mingw* | windows*)
+        MBRTOWC_LIB=
+        ;;
       *)
         gl_WEAK_SYMBOLS
         case "$gl_cv_have_weak" in
-          *yes) LIB_MBRTOWC= ;;
-          *)    LIB_MBRTOWC="$LIBPTHREAD" ;;
+          *yes) MBRTOWC_LIB= ;;
+          *)    MBRTOWC_LIB="$LIBPTHREAD" ;;
         esac
         ;;
     esac
   else
-    LIB_MBRTOWC=
+    MBRTOWC_LIB=
   fi
-  dnl LIB_MBRTOWC is expected to be '-pthread' or '-lpthread' on AIX
+  dnl MBRTOWC_LIB is expected to be '-pthread' or '-lpthread' on AIX
   dnl with gcc or xlc, and empty otherwise.
+  AC_SUBST([MBRTOWC_LIB])
+  dnl For backward compatibility.
+  LIB_MBRTOWC="$MBRTOWC_LIB"
   AC_SUBST([LIB_MBRTOWC])
 ])
 
@@ -114,7 +113,7 @@ dnl Result is REPLACE_MBSTATE_T.
 dnl When this is set to 1, we replace both mbsinit() and mbrtowc(), in order to
 dnl avoid inconsistencies.
 
-AC_DEFUN([gl_MBSTATE_T_BROKEN],
+AC_DEFUN_ONCE([gl_MBSTATE_T_BROKEN],
 [
   AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
   AC_REQUIRE([AC_CANONICAL_HOST])
@@ -126,7 +125,7 @@ AC_DEFUN([gl_MBSTATE_T_BROKEN],
   dnl to override it, even if - like on MSVC - mbsinit() is only defined as
   dnl an inline function, not as a global function.
   if case "$host_os" in
-       mingw*) true ;;
+       mingw* | windows*) true ;;
        *) test $ac_cv_func_mbsinit = yes ;;
      esac \
     && test $ac_cv_func_mbrtowc = yes; then
@@ -154,7 +153,7 @@ AC_DEFUN([gl_MBRTOWC_INCOMPLETE_STATE],
 [
   AC_REQUIRE([AC_PROG_CC])
   AC_REQUIRE([gt_LOCALE_JA])
-  AC_REQUIRE([gt_LOCALE_FR_UTF8])
+  AC_REQUIRE([gt_LOCALE_EN_UTF8])
   AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
   AC_CACHE_CHECK([whether mbrtowc handles incomplete characters],
     [gl_cv_func_mbrtowc_incomplete_state],
@@ -163,10 +162,10 @@ AC_DEFUN([gl_MBRTOWC_INCOMPLETE_STATE],
       dnl is present.
 changequote(,)dnl
       case "$host_os" in
-                     # Guess no on AIX and OSF/1.
-        aix* | osf*) gl_cv_func_mbrtowc_incomplete_state="guessing no" ;;
-                     # Guess yes otherwise.
-        *)           gl_cv_func_mbrtowc_incomplete_state="guessing yes" ;;
+              # Guess no on AIX.
+        aix*) gl_cv_func_mbrtowc_incomplete_state="guessing no" ;;
+              # Guess yes otherwise.
+        *)    gl_cv_func_mbrtowc_incomplete_state="guessing yes" ;;
       esac
 changequote([,])dnl
       if test $LOCALE_JA != none; then
@@ -194,7 +193,7 @@ int main ()
           [gl_cv_func_mbrtowc_incomplete_state=no],
           [:])
       else
-        if test $LOCALE_FR_UTF8 != none; then
+        if test "$LOCALE_EN_UTF8" != none; then
           AC_RUN_IFELSE(
             [AC_LANG_SOURCE([[
 #include <locale.h>
@@ -202,7 +201,7 @@ int main ()
 #include <wchar.h>
 int main ()
 {
-  if (setlocale (LC_ALL, "$LOCALE_FR_UTF8") != NULL)
+  if (setlocale (LC_ALL, "$LOCALE_EN_UTF8") != NULL)
     {
       const char input[] = "B\303\274\303\237er"; /* "Büßer" */
       mbstate_t state;
@@ -282,7 +281,7 @@ dnl Result is gl_cv_func_mbrtowc_null_arg1.
 AC_DEFUN([gl_MBRTOWC_NULL_ARG1],
 [
   AC_REQUIRE([AC_PROG_CC])
-  AC_REQUIRE([gt_LOCALE_FR_UTF8])
+  AC_REQUIRE([gt_LOCALE_EN_UTF8])
   AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
   AC_CACHE_CHECK([whether mbrtowc handles a NULL pwc argument],
     [gl_cv_func_mbrtowc_null_arg1],
@@ -297,7 +296,7 @@ changequote(,)dnl
         *)        gl_cv_func_mbrtowc_null_arg1="guessing yes" ;;
       esac
 changequote([,])dnl
-      if test $LOCALE_FR_UTF8 != none; then
+      if test "$LOCALE_EN_UTF8" != none; then
         AC_RUN_IFELSE(
           [AC_LANG_SOURCE([[
 #include <locale.h>
@@ -308,7 +307,7 @@ int main ()
 {
   int result = 0;
 
-  if (setlocale (LC_ALL, "$LOCALE_FR_UTF8") != NULL)
+  if (setlocale (LC_ALL, "$LOCALE_EN_UTF8") != NULL)
     {
       char input[] = "\303\237er";
       mbstate_t state;
@@ -339,57 +338,6 @@ int main ()
     ])
 ])
 
-dnl Test whether mbrtowc supports a NULL string argument correctly.
-dnl Result is gl_cv_func_mbrtowc_null_arg2.
-
-AC_DEFUN([gl_MBRTOWC_NULL_ARG2],
-[
-  AC_REQUIRE([AC_PROG_CC])
-  AC_REQUIRE([gt_LOCALE_FR_UTF8])
-  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
-  AC_CACHE_CHECK([whether mbrtowc handles a NULL string argument],
-    [gl_cv_func_mbrtowc_null_arg2],
-    [
-      dnl Initial guess, used when cross-compiling or when no suitable locale
-      dnl is present.
-changequote(,)dnl
-      case "$host_os" in
-              # Guess no on OSF/1.
-        osf*) gl_cv_func_mbrtowc_null_arg2="guessing no" ;;
-              # Guess yes otherwise.
-        *)    gl_cv_func_mbrtowc_null_arg2="guessing yes" ;;
-      esac
-changequote([,])dnl
-      if test $LOCALE_FR_UTF8 != none; then
-        AC_RUN_IFELSE(
-          [AC_LANG_SOURCE([[
-#include <locale.h>
-#include <string.h>
-#include <wchar.h>
-int main ()
-{
-  if (setlocale (LC_ALL, "$LOCALE_FR_UTF8") != NULL)
-    {
-      mbstate_t state;
-      wchar_t wc;
-      int ret;
-
-      memset (&state, '\0', sizeof (mbstate_t));
-      wc = (wchar_t) 0xBADFACE;
-      mbrtowc (&wc, NULL, 5, &state);
-      /* Check that wc was not modified.  */
-      if (wc != (wchar_t) 0xBADFACE)
-        return 2;
-    }
-  return 0;
-}]])],
-          [gl_cv_func_mbrtowc_null_arg2=yes],
-          [gl_cv_func_mbrtowc_null_arg2=no],
-          [:])
-      fi
-    ])
-])
-
 dnl Test whether mbrtowc, when parsing the end of a multibyte character,
 dnl correctly returns the number of bytes that were needed to complete the
 dnl character (not the total number of bytes of the multibyte character).
@@ -398,7 +346,7 @@ dnl Result is gl_cv_func_mbrtowc_retval.
 AC_DEFUN([gl_MBRTOWC_RETVAL],
 [
   AC_REQUIRE([AC_PROG_CC])
-  AC_REQUIRE([gt_LOCALE_FR_UTF8])
+  AC_REQUIRE([gt_LOCALE_EN_UTF8])
   AC_REQUIRE([gt_LOCALE_JA])
   AC_REQUIRE([AC_CANONICAL_HOST])
   AC_CACHE_CHECK([whether mbrtowc has a correct return value],
@@ -408,14 +356,16 @@ AC_DEFUN([gl_MBRTOWC_RETVAL],
       dnl is present.
 changequote(,)dnl
       case "$host_os" in
-                                   # Guess no on HP-UX, Solaris, native Windows.
-        hpux* | solaris* | mingw*) gl_cv_func_mbrtowc_retval="guessing no" ;;
-                                   # Guess yes otherwise.
-        *)                         gl_cv_func_mbrtowc_retval="guessing yes" ;;
+          # Guess no on HP-UX, Solaris, native Windows.
+        hpux* | solaris* | mingw* | windows*)
+          gl_cv_func_mbrtowc_retval="guessing no" ;;
+          # Guess yes otherwise.
+        *)
+          gl_cv_func_mbrtowc_retval="guessing yes" ;;
       esac
 changequote([,])dnl
-      if test $LOCALE_FR_UTF8 != none || test $LOCALE_JA != none \
-         || { case "$host_os" in mingw*) true;; *) false;; esac; }; then
+      if test "$LOCALE_EN_UTF8" != none || test $LOCALE_JA != none \
+         || { case "$host_os" in mingw* | windows*) true;; *) false;; esac; }; then
         AC_RUN_IFELSE(
           [AC_LANG_SOURCE([[
 #include <locale.h>
@@ -426,7 +376,8 @@ int main ()
   int result = 0;
   int found_some_locale = 0;
   /* This fails on Solaris.  */
-  if (setlocale (LC_ALL, "$LOCALE_FR_UTF8") != NULL)
+  if (strcmp ("$LOCALE_EN_UTF8", "none") != 0
+      && setlocale (LC_ALL, "$LOCALE_EN_UTF8") != NULL)
     {
       char input[] = "B\303\274\303\237er"; /* "Büßer" */
       mbstate_t state;
@@ -442,7 +393,8 @@ int main ()
       found_some_locale = 1;
     }
   /* This fails on HP-UX 11.11.  */
-  if (setlocale (LC_ALL, "$LOCALE_JA") != NULL)
+  if (strcmp ("$LOCALE_JA", "none") != 0
+      && setlocale (LC_ALL, "$LOCALE_JA") != NULL)
     {
       char input[] = "B\217\253\344\217\251\316er"; /* "Büßer" */
       mbstate_t state;
@@ -577,13 +529,13 @@ AC_DEFUN([gl_MBRTOWC_STORES_INCOMPLETE],
      dnl is present.
 changequote(,)dnl
      case "$host_os" in
-               # Guess yes on native Windows.
-       mingw*) gl_cv_func_mbrtowc_stores_incomplete="guessing yes" ;;
-       *)      gl_cv_func_mbrtowc_stores_incomplete="guessing no" ;;
+                          # Guess yes on native Windows.
+       mingw* | windows*) gl_cv_func_mbrtowc_stores_incomplete="guessing yes" ;;
+       *)                 gl_cv_func_mbrtowc_stores_incomplete="guessing no" ;;
      esac
 changequote([,])dnl
      case "$host_os" in
-       mingw*)
+       mingw* | windows*)
          AC_RUN_IFELSE(
            [AC_LANG_SOURCE([[
 #include <locale.h>
@@ -639,8 +591,8 @@ int main ()
            [:])
          ;;
        *)
-         AC_REQUIRE([gt_LOCALE_FR_UTF8])
-         if test $LOCALE_FR_UTF8 != none; then
+         AC_REQUIRE([gt_LOCALE_EN_UTF8])
+         if test "$LOCALE_EN_UTF8" != none; then
            AC_RUN_IFELSE(
              [AC_LANG_SOURCE([[
 #include <locale.h>
@@ -648,7 +600,7 @@ int main ()
 #include <wchar.h>
 int main ()
 {
-  if (setlocale (LC_ALL, "$LOCALE_FR_UTF8") != NULL)
+  if (setlocale (LC_ALL, "$LOCALE_EN_UTF8") != NULL)
     {
       wchar_t wc = (wchar_t) 0xBADFACE;
       mbstate_t state;
@@ -677,50 +629,46 @@ AC_DEFUN([gl_MBRTOWC_EMPTY_INPUT],
   AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
   AC_CACHE_CHECK([whether mbrtowc works on empty input],
     [gl_cv_func_mbrtowc_empty_input],
-    [
-      dnl Initial guess, used when cross-compiling or when no suitable locale
-      dnl is present.
-changequote(,)dnl
-      case "$host_os" in
-                              # Guess no on AIX and glibc systems.
-        aix* | *-gnu* | gnu*) gl_cv_func_mbrtowc_empty_input="guessing no" ;;
-                              # Guess yes on native Windows.
-        mingw*)               gl_cv_func_mbrtowc_empty_input="guessing yes" ;;
-        *)                    gl_cv_func_mbrtowc_empty_input="guessing yes" ;;
-      esac
-changequote([,])dnl
-      AC_RUN_IFELSE(
-        [AC_LANG_SOURCE([[
-           #include <wchar.h>
-           static wchar_t wc;
-           static mbstate_t mbs;
-           int
-           main (void)
-           {
-             return mbrtowc (&wc, "", 0, &mbs) != (size_t) -2;
-           }]])],
-        [gl_cv_func_mbrtowc_empty_input=yes],
-        [gl_cv_func_mbrtowc_empty_input=no],
-        [:])
+    [AC_RUN_IFELSE(
+       [AC_LANG_SOURCE([[
+          #include <wchar.h>
+          static wchar_t wc;
+          static mbstate_t mbs;
+          int
+          main (void)
+          {
+            return mbrtowc (&wc, "", 0, &mbs) != (size_t) -2;
+          }]])],
+       [gl_cv_func_mbrtowc_empty_input=yes],
+       [gl_cv_func_mbrtowc_empty_input=no],
+       [case "$host_os" in
+                                # Guess no on AIX and glibc systems.
+          aix* | *-gnu* | gnu*) gl_cv_func_mbrtowc_empty_input="guessing no" ;;
+                                # Guess no on Android.
+          linux*-android*)      gl_cv_func_mbrtowc_empty_input="guessing no" ;;
+                                # Guess no on native Windows.
+          mingw* | windows*)    gl_cv_func_mbrtowc_empty_input="guessing no" ;;
+          *)                    gl_cv_func_mbrtowc_empty_input="guessing yes" ;;
+        esac
+       ])
     ])
 ])
 
 dnl Test whether mbrtowc reports encoding errors in the C locale.
 dnl Although POSIX was never intended to allow this, the GNU C Library
 dnl and other implementations do it.  See:
-dnl https://sourceware.org/bugzilla/show_bug.cgi?id=19932
+dnl https://sourceware.org/PR19932
+dnl POSIX has now clarified it:
+dnl <https://pubs.opengroup.org/onlinepubs/9699919799/functions/mbrtowc.html>
+dnl says: "In the POSIX locale an [EILSEQ] error cannot occur since all byte
+dnl values are valid characters."
 
 AC_DEFUN([gl_MBRTOWC_C_LOCALE],
 [
   AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
   AC_CACHE_CHECK([whether the C locale is free of encoding errors],
     [gl_cv_func_mbrtowc_C_locale_sans_EILSEQ],
-    [
-     dnl Initial guess, used when cross-compiling or when no suitable locale
-     dnl is present.
-     gl_cv_func_mbrtowc_C_locale_sans_EILSEQ="$gl_cross_guess_normal"
-
-     AC_RUN_IFELSE(
+    [AC_RUN_IFELSE(
        [AC_LANG_PROGRAM(
           [[#include <limits.h>
             #include <locale.h>
@@ -741,13 +689,14 @@ AC_DEFUN([gl_MBRTOWC_C_LOCALE],
               }
             return 0;
           ]])],
-      [gl_cv_func_mbrtowc_C_locale_sans_EILSEQ=yes],
-      [gl_cv_func_mbrtowc_C_locale_sans_EILSEQ=no],
-      [case "$host_os" in
-                 # Guess yes on native Windows.
-         mingw*) gl_cv_func_mbrtowc_C_locale_sans_EILSEQ="guessing yes" ;;
-       esac
-      ])
+       [gl_cv_func_mbrtowc_C_locale_sans_EILSEQ=yes],
+       [gl_cv_func_mbrtowc_C_locale_sans_EILSEQ=no],
+       [case "$host_os" in
+                             # Guess yes on native Windows.
+          mingw* | windows*) gl_cv_func_mbrtowc_C_locale_sans_EILSEQ="guessing yes" ;;
+          *)                 gl_cv_func_mbrtowc_C_locale_sans_EILSEQ="$gl_cross_guess_normal" ;;
+        esac
+       ])
     ])
 ])