1 files changed, 216 insertions, 29 deletions

diff --git a/m4/iconv.m4 b/m4/iconv.m4
index 654c415..e593b72 100644
--- a/m4/iconv.m4
+++ b/m4/iconv.m4
@@ -1,5 +1,6 @@
-# iconv.m4 serial AM4 (gettext-0.11.3)
-dnl Copyright (C) 2000-2002 Free Software Foundation, Inc.
+# iconv.m4 serial 21
+dnl Copyright (C) 2000-2002, 2007-2014, 2016-2020 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.
@@ -21,6 +22,7 @@ AC_DEFUN([AM_ICONV_LINK],
 [
   dnl Some systems have iconv in libc, some have it in libiconv (OSF/1 and
   dnl those with the standalone portable GNU libiconv installed).
+  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
 
   dnl Search for libiconv and define LIBICONV, LTLIBICONV and INCICONV
   dnl accordingly.
@@ -29,34 +31,185 @@ AC_DEFUN([AM_ICONV_LINK],
   dnl Add $INCICONV to CPPFLAGS before performing the following checks,
   dnl because if the user has installed libiconv and not disabled its use
   dnl via --without-libiconv-prefix, he wants to use it. The first
-  dnl AC_TRY_LINK will then fail, the second AC_TRY_LINK will succeed.
+  dnl AC_LINK_IFELSE will then fail, the second AC_LINK_IFELSE will succeed.
   am_save_CPPFLAGS="$CPPFLAGS"
   AC_LIB_APPENDTOVAR([CPPFLAGS], [$INCICONV])
 
-  AC_CACHE_CHECK(for iconv, am_cv_func_iconv, [
+  AC_CACHE_CHECK([for iconv], [am_cv_func_iconv], [
     am_cv_func_iconv="no, consider installing GNU libiconv"
     am_cv_lib_iconv=no
-    AC_TRY_LINK([#include <stdlib.h>
-#include <iconv.h>],
-      [iconv_t cd = iconv_open("","");
-       iconv(cd,NULL,NULL,NULL,NULL);
-       iconv_close(cd);],
-      am_cv_func_iconv=yes)
+    AC_LINK_IFELSE(
+      [AC_LANG_PROGRAM(
+         [[
+#include <stdlib.h>
+#include <iconv.h>
+         ]],
+         [[iconv_t cd = iconv_open("","");
+           iconv(cd,NULL,NULL,NULL,NULL);
+           iconv_close(cd);]])],
+      [am_cv_func_iconv=yes])
     if test "$am_cv_func_iconv" != yes; then
       am_save_LIBS="$LIBS"
       LIBS="$LIBS $LIBICONV"
-      AC_TRY_LINK([#include <stdlib.h>
-#include <iconv.h>],
-        [iconv_t cd = iconv_open("","");
-         iconv(cd,NULL,NULL,NULL,NULL);
-         iconv_close(cd);],
-        am_cv_lib_iconv=yes
-        am_cv_func_iconv=yes)
+      AC_LINK_IFELSE(
+        [AC_LANG_PROGRAM(
+           [[
+#include <stdlib.h>
+#include <iconv.h>
+           ]],
+           [[iconv_t cd = iconv_open("","");
+             iconv(cd,NULL,NULL,NULL,NULL);
+             iconv_close(cd);]])],
+        [am_cv_lib_iconv=yes]
+        [am_cv_func_iconv=yes])
       LIBS="$am_save_LIBS"
     fi
   ])
   if test "$am_cv_func_iconv" = yes; then
-    AC_DEFINE(HAVE_ICONV, 1, [Define if you have the iconv() function.])
+    AC_CACHE_CHECK([for working iconv], [am_cv_func_iconv_works], [
+      dnl This tests against bugs in AIX 5.1, AIX 6.1..7.1, HP-UX 11.11,
+      dnl Solaris 10.
+      am_save_LIBS="$LIBS"
+      if test $am_cv_lib_iconv = yes; then
+        LIBS="$LIBS $LIBICONV"
+      fi
+      am_cv_func_iconv_works=no
+      for ac_iconv_const in '' 'const'; do
+        AC_RUN_IFELSE(
+          [AC_LANG_PROGRAM(
+             [[
+#include <iconv.h>
+#include <string.h>
+
+#ifndef ICONV_CONST
+# define ICONV_CONST $ac_iconv_const
+#endif
+             ]],
+             [[int result = 0;
+  /* Test against AIX 5.1 bug: Failures are not distinguishable from successful
+     returns.  */
+  {
+    iconv_t cd_utf8_to_88591 = iconv_open ("ISO8859-1", "UTF-8");
+    if (cd_utf8_to_88591 != (iconv_t)(-1))
+      {
+        static ICONV_CONST char input[] = "\342\202\254"; /* EURO SIGN */
+        char buf[10];
+        ICONV_CONST char *inptr = input;
+        size_t inbytesleft = strlen (input);
+        char *outptr = buf;
+        size_t outbytesleft = sizeof (buf);
+        size_t res = iconv (cd_utf8_to_88591,
+                            &inptr, &inbytesleft,
+                            &outptr, &outbytesleft);
+        if (res == 0)
+          result |= 1;
+        iconv_close (cd_utf8_to_88591);
+      }
+  }
+  /* Test against Solaris 10 bug: Failures are not distinguishable from
+     successful returns.  */
+  {
+    iconv_t cd_ascii_to_88591 = iconv_open ("ISO8859-1", "646");
+    if (cd_ascii_to_88591 != (iconv_t)(-1))
+      {
+        static ICONV_CONST char input[] = "\263";
+        char buf[10];
+        ICONV_CONST char *inptr = input;
+        size_t inbytesleft = strlen (input);
+        char *outptr = buf;
+        size_t outbytesleft = sizeof (buf);
+        size_t res = iconv (cd_ascii_to_88591,
+                            &inptr, &inbytesleft,
+                            &outptr, &outbytesleft);
+        if (res == 0)
+          result |= 2;
+        iconv_close (cd_ascii_to_88591);
+      }
+  }
+  /* Test against AIX 6.1..7.1 bug: Buffer overrun.  */
+  {
+    iconv_t cd_88591_to_utf8 = iconv_open ("UTF-8", "ISO-8859-1");
+    if (cd_88591_to_utf8 != (iconv_t)(-1))
+      {
+        static ICONV_CONST char input[] = "\304";
+        static char buf[2] = { (char)0xDE, (char)0xAD };
+        ICONV_CONST char *inptr = input;
+        size_t inbytesleft = 1;
+        char *outptr = buf;
+        size_t outbytesleft = 1;
+        size_t res = iconv (cd_88591_to_utf8,
+                            &inptr, &inbytesleft,
+                            &outptr, &outbytesleft);
+        if (res != (size_t)(-1) || outptr - buf > 1 || buf[1] != (char)0xAD)
+          result |= 4;
+        iconv_close (cd_88591_to_utf8);
+      }
+  }
+#if 0 /* This bug could be worked around by the caller.  */
+  /* Test against HP-UX 11.11 bug: Positive return value instead of 0.  */
+  {
+    iconv_t cd_88591_to_utf8 = iconv_open ("utf8", "iso88591");
+    if (cd_88591_to_utf8 != (iconv_t)(-1))
+      {
+        static ICONV_CONST char input[] = "\304rger mit b\366sen B\374bchen ohne Augenma\337";
+        char buf[50];
+        ICONV_CONST char *inptr = input;
+        size_t inbytesleft = strlen (input);
+        char *outptr = buf;
+        size_t outbytesleft = sizeof (buf);
+        size_t res = iconv (cd_88591_to_utf8,
+                            &inptr, &inbytesleft,
+                            &outptr, &outbytesleft);
+        if ((int)res > 0)
+          result |= 8;
+        iconv_close (cd_88591_to_utf8);
+      }
+  }
+#endif
+  /* Test against HP-UX 11.11 bug: No converter from EUC-JP to UTF-8 is
+     provided.  */
+  {
+    /* Try standardized names.  */
+    iconv_t cd1 = iconv_open ("UTF-8", "EUC-JP");
+    /* Try IRIX, OSF/1 names.  */
+    iconv_t cd2 = iconv_open ("UTF-8", "eucJP");
+    /* Try AIX names.  */
+    iconv_t cd3 = iconv_open ("UTF-8", "IBM-eucJP");
+    /* Try HP-UX names.  */
+    iconv_t cd4 = iconv_open ("utf8", "eucJP");
+    if (cd1 == (iconv_t)(-1) && cd2 == (iconv_t)(-1)
+        && cd3 == (iconv_t)(-1) && cd4 == (iconv_t)(-1))
+      result |= 16;
+    if (cd1 != (iconv_t)(-1))
+      iconv_close (cd1);
+    if (cd2 != (iconv_t)(-1))
+      iconv_close (cd2);
+    if (cd3 != (iconv_t)(-1))
+      iconv_close (cd3);
+    if (cd4 != (iconv_t)(-1))
+      iconv_close (cd4);
+  }
+  return result;
+]])],
+          [am_cv_func_iconv_works=yes], ,
+          [case "$host_os" in
+             aix* | hpux*) am_cv_func_iconv_works="guessing no" ;;
+             *)            am_cv_func_iconv_works="guessing yes" ;;
+           esac])
+        test "$am_cv_func_iconv_works" = no || break
+      done
+      LIBS="$am_save_LIBS"
+    ])
+    case "$am_cv_func_iconv_works" in
+      *no) am_func_iconv=no am_cv_lib_iconv=no ;;
+      *)   am_func_iconv=yes ;;
+    esac
+  else
+    am_func_iconv=no am_cv_lib_iconv=no
+  fi
+  if test "$am_func_iconv" = yes; then
+    AC_DEFINE([HAVE_ICONV], [1],
+      [Define if you have the iconv() function and it works.])
   fi
   if test "$am_cv_lib_iconv" = yes; then
     AC_MSG_CHECKING([how to link with libiconv])
@@ -68,34 +221,68 @@ AC_DEFUN([AM_ICONV_LINK],
     LIBICONV=
     LTLIBICONV=
   fi
-  AC_SUBST(LIBICONV)
-  AC_SUBST(LTLIBICONV)
+  AC_SUBST([LIBICONV])
+  AC_SUBST([LTLIBICONV])
 ])
 
-AC_DEFUN([AM_ICONV],
+dnl Define AM_ICONV using AC_DEFUN_ONCE for Autoconf >= 2.64, in order to
+dnl avoid warnings like
+dnl "warning: AC_REQUIRE: `AM_ICONV' was expanded before it was required".
+dnl This is tricky because of the way 'aclocal' is implemented:
+dnl - It requires defining an auxiliary macro whose name ends in AC_DEFUN.
+dnl   Otherwise aclocal's initial scan pass would miss the macro definition.
+dnl - It requires a line break inside the AC_DEFUN_ONCE and AC_DEFUN expansions.
+dnl   Otherwise aclocal would emit many "Use of uninitialized value $1"
+dnl   warnings.
+m4_define([gl_iconv_AC_DEFUN],
+  m4_version_prereq([2.64],
+    [[AC_DEFUN_ONCE(
+        [$1], [$2])]],
+    [m4_ifdef([gl_00GNULIB],
+       [[AC_DEFUN_ONCE(
+           [$1], [$2])]],
+       [[AC_DEFUN(
+           [$1], [$2])]])]))
+gl_iconv_AC_DEFUN([AM_ICONV],
 [
   AM_ICONV_LINK
   if test "$am_cv_func_iconv" = yes; then
     AC_MSG_CHECKING([for iconv declaration])
-    AC_CACHE_VAL(am_cv_proto_iconv, [
-      AC_TRY_COMPILE([
+    AC_CACHE_VAL([am_cv_proto_iconv], [
+      AC_COMPILE_IFELSE(
+        [AC_LANG_PROGRAM(
+           [[
 #include <stdlib.h>
 #include <iconv.h>
 extern
 #ifdef __cplusplus
 "C"
 #endif
-#if defined(__STDC__) || defined(__cplusplus)
+#if defined(__STDC__) || defined(_MSC_VER) || defined(__cplusplus)
 size_t iconv (iconv_t cd, char * *inbuf, size_t *inbytesleft, char * *outbuf, size_t *outbytesleft);
 #else
 size_t iconv();
 #endif
-], [], am_cv_proto_iconv_arg1="", am_cv_proto_iconv_arg1="const")
+           ]],
+           [[]])],
+        [am_cv_proto_iconv_arg1=""],
+        [am_cv_proto_iconv_arg1="const"])
       am_cv_proto_iconv="extern size_t iconv (iconv_t cd, $am_cv_proto_iconv_arg1 char * *inbuf, size_t *inbytesleft, char * *outbuf, size_t *outbytesleft);"])
     am_cv_proto_iconv=`echo "[$]am_cv_proto_iconv" | tr -s ' ' | sed -e 's/( /(/'`
-    AC_MSG_RESULT([$]{ac_t:-
-         }[$]am_cv_proto_iconv)
-    AC_DEFINE_UNQUOTED(ICONV_CONST, $am_cv_proto_iconv_arg1,
-      [Define as const if the declaration of iconv() needs const.])
+    AC_MSG_RESULT([
+         $am_cv_proto_iconv])
+  else
+    dnl When compiling GNU libiconv on a system that does not have iconv yet,
+    dnl pick the POSIX compliant declaration without 'const'.
+    am_cv_proto_iconv_arg1=""
   fi
+  AC_DEFINE_UNQUOTED([ICONV_CONST], [$am_cv_proto_iconv_arg1],
+    [Define as const if the declaration of iconv() needs const.])
+  dnl Also substitute ICONV_CONST in the gnulib generated <iconv.h>.
+  m4_ifdef([gl_ICONV_H_DEFAULTS],
+    [AC_REQUIRE([gl_ICONV_H_DEFAULTS])
+     if test -n "$am_cv_proto_iconv_arg1"; then
+       ICONV_CONST="const"
+     fi
+    ])
 ])