1# iconv.m4 serial 23 2dnl Copyright (C) 2000-2002, 2007-2014, 2016-2020 Free Software Foundation, 3dnl Inc. 4dnl This file is free software; the Free Software Foundation 5dnl gives unlimited permission to copy and/or distribute it, 6dnl with or without modifications, as long as this notice is preserved. 7 8dnl From Bruno Haible. 9 10AC_PREREQ([2.64]) 11 12dnl Note: AM_ICONV is documented in the GNU gettext manual 13dnl <https://www.gnu.org/software/gettext/manual/html_node/AM_005fICONV.html>. 14dnl Don't make changes that are incompatible with that documentation! 15 16AC_DEFUN([AM_ICONV_LINKFLAGS_BODY], 17[ 18 dnl Prerequisites of AC_LIB_LINKFLAGS_BODY. 19 AC_REQUIRE([AC_LIB_PREPARE_PREFIX]) 20 AC_REQUIRE([AC_LIB_RPATH]) 21 22 dnl Search for libiconv and define LIBICONV, LTLIBICONV and INCICONV 23 dnl accordingly. 24 AC_LIB_LINKFLAGS_BODY([iconv]) 25]) 26 27AC_DEFUN([AM_ICONV_LINK], 28[ 29 dnl Some systems have iconv in libc, some have it in libiconv (OSF/1 and 30 dnl those with the standalone portable GNU libiconv installed). 31 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles 32 33 dnl Search for libiconv and define LIBICONV, LTLIBICONV and INCICONV 34 dnl accordingly. 35 AC_REQUIRE([AM_ICONV_LINKFLAGS_BODY]) 36 37 dnl Add $INCICONV to CPPFLAGS before performing the following checks, 38 dnl because if the user has installed libiconv and not disabled its use 39 dnl via --without-libiconv-prefix, he wants to use it. The first 40 dnl AC_LINK_IFELSE will then fail, the second AC_LINK_IFELSE will succeed. 41 am_save_CPPFLAGS="$CPPFLAGS" 42 AC_LIB_APPENDTOVAR([CPPFLAGS], [$INCICONV]) 43 44 AC_CACHE_CHECK([for iconv], [am_cv_func_iconv], [ 45 am_cv_func_iconv="no, consider installing GNU libiconv" 46 am_cv_lib_iconv=no 47 AC_LINK_IFELSE( 48 [AC_LANG_PROGRAM( 49 [[ 50#include <stdlib.h> 51#include <iconv.h> 52 ]], 53 [[iconv_t cd = iconv_open("",""); 54 iconv(cd,NULL,NULL,NULL,NULL); 55 iconv_close(cd);]])], 56 [am_cv_func_iconv=yes]) 57 if test "$am_cv_func_iconv" != yes; then 58 am_save_LIBS="$LIBS" 59 LIBS="$LIBS $LIBICONV" 60 AC_LINK_IFELSE( 61 [AC_LANG_PROGRAM( 62 [[ 63#include <stdlib.h> 64#include <iconv.h> 65 ]], 66 [[iconv_t cd = iconv_open("",""); 67 iconv(cd,NULL,NULL,NULL,NULL); 68 iconv_close(cd);]])], 69 [am_cv_lib_iconv=yes] 70 [am_cv_func_iconv=yes]) 71 LIBS="$am_save_LIBS" 72 fi 73 ]) 74 if test "$am_cv_func_iconv" = yes; then 75 AC_CACHE_CHECK([for working iconv], [am_cv_func_iconv_works], [ 76 dnl This tests against bugs in AIX 5.1, AIX 6.1..7.1, HP-UX 11.11, 77 dnl Solaris 10. 78 am_save_LIBS="$LIBS" 79 if test $am_cv_lib_iconv = yes; then 80 LIBS="$LIBS $LIBICONV" 81 fi 82 am_cv_func_iconv_works=no 83 for ac_iconv_const in '' 'const'; do 84 AC_RUN_IFELSE( 85 [AC_LANG_PROGRAM( 86 [[ 87#include <iconv.h> 88#include <string.h> 89 90#ifndef ICONV_CONST 91# define ICONV_CONST $ac_iconv_const 92#endif 93 ]], 94 [[int result = 0; 95 /* Test against AIX 5.1 bug: Failures are not distinguishable from successful 96 returns. */ 97 { 98 iconv_t cd_utf8_to_88591 = iconv_open ("ISO8859-1", "UTF-8"); 99 if (cd_utf8_to_88591 != (iconv_t)(-1)) 100 { 101 static ICONV_CONST char input[] = "\342\202\254"; /* EURO SIGN */ 102 char buf[10]; 103 ICONV_CONST char *inptr = input; 104 size_t inbytesleft = strlen (input); 105 char *outptr = buf; 106 size_t outbytesleft = sizeof (buf); 107 size_t res = iconv (cd_utf8_to_88591, 108 &inptr, &inbytesleft, 109 &outptr, &outbytesleft); 110 if (res == 0) 111 result |= 1; 112 iconv_close (cd_utf8_to_88591); 113 } 114 } 115 /* Test against Solaris 10 bug: Failures are not distinguishable from 116 successful returns. */ 117 { 118 iconv_t cd_ascii_to_88591 = iconv_open ("ISO8859-1", "646"); 119 if (cd_ascii_to_88591 != (iconv_t)(-1)) 120 { 121 static ICONV_CONST char input[] = "\263"; 122 char buf[10]; 123 ICONV_CONST char *inptr = input; 124 size_t inbytesleft = strlen (input); 125 char *outptr = buf; 126 size_t outbytesleft = sizeof (buf); 127 size_t res = iconv (cd_ascii_to_88591, 128 &inptr, &inbytesleft, 129 &outptr, &outbytesleft); 130 if (res == 0) 131 result |= 2; 132 iconv_close (cd_ascii_to_88591); 133 } 134 } 135 /* Test against AIX 6.1..7.1 bug: Buffer overrun. */ 136 { 137 iconv_t cd_88591_to_utf8 = iconv_open ("UTF-8", "ISO-8859-1"); 138 if (cd_88591_to_utf8 != (iconv_t)(-1)) 139 { 140 static ICONV_CONST char input[] = "\304"; 141 static char buf[2] = { (char)0xDE, (char)0xAD }; 142 ICONV_CONST char *inptr = input; 143 size_t inbytesleft = 1; 144 char *outptr = buf; 145 size_t outbytesleft = 1; 146 size_t res = iconv (cd_88591_to_utf8, 147 &inptr, &inbytesleft, 148 &outptr, &outbytesleft); 149 if (res != (size_t)(-1) || outptr - buf > 1 || buf[1] != (char)0xAD) 150 result |= 4; 151 iconv_close (cd_88591_to_utf8); 152 } 153 } 154#if 0 /* This bug could be worked around by the caller. */ 155 /* Test against HP-UX 11.11 bug: Positive return value instead of 0. */ 156 { 157 iconv_t cd_88591_to_utf8 = iconv_open ("utf8", "iso88591"); 158 if (cd_88591_to_utf8 != (iconv_t)(-1)) 159 { 160 static ICONV_CONST char input[] = "\304rger mit b\366sen B\374bchen ohne Augenma\337"; 161 char buf[50]; 162 ICONV_CONST char *inptr = input; 163 size_t inbytesleft = strlen (input); 164 char *outptr = buf; 165 size_t outbytesleft = sizeof (buf); 166 size_t res = iconv (cd_88591_to_utf8, 167 &inptr, &inbytesleft, 168 &outptr, &outbytesleft); 169 if ((int)res > 0) 170 result |= 8; 171 iconv_close (cd_88591_to_utf8); 172 } 173 } 174#endif 175 /* Test against HP-UX 11.11 bug: No converter from EUC-JP to UTF-8 is 176 provided. */ 177 { 178 /* Try standardized names. */ 179 iconv_t cd1 = iconv_open ("UTF-8", "EUC-JP"); 180 /* Try IRIX, OSF/1 names. */ 181 iconv_t cd2 = iconv_open ("UTF-8", "eucJP"); 182 /* Try AIX names. */ 183 iconv_t cd3 = iconv_open ("UTF-8", "IBM-eucJP"); 184 /* Try HP-UX names. */ 185 iconv_t cd4 = iconv_open ("utf8", "eucJP"); 186 if (cd1 == (iconv_t)(-1) && cd2 == (iconv_t)(-1) 187 && cd3 == (iconv_t)(-1) && cd4 == (iconv_t)(-1)) 188 result |= 16; 189 if (cd1 != (iconv_t)(-1)) 190 iconv_close (cd1); 191 if (cd2 != (iconv_t)(-1)) 192 iconv_close (cd2); 193 if (cd3 != (iconv_t)(-1)) 194 iconv_close (cd3); 195 if (cd4 != (iconv_t)(-1)) 196 iconv_close (cd4); 197 } 198 return result; 199]])], 200 [am_cv_func_iconv_works=yes], , 201 [case "$host_os" in 202 aix* | hpux*) am_cv_func_iconv_works="guessing no" ;; 203 *) am_cv_func_iconv_works="guessing yes" ;; 204 esac]) 205 test "$am_cv_func_iconv_works" = no || break 206 done 207 LIBS="$am_save_LIBS" 208 ]) 209 case "$am_cv_func_iconv_works" in 210 *no) am_func_iconv=no am_cv_lib_iconv=no ;; 211 *) am_func_iconv=yes ;; 212 esac 213 else 214 am_func_iconv=no am_cv_lib_iconv=no 215 fi 216 if test "$am_func_iconv" = yes; then 217 AC_DEFINE([HAVE_ICONV], [1], 218 [Define if you have the iconv() function and it works.]) 219 fi 220 if test "$am_cv_lib_iconv" = yes; then 221 AC_MSG_CHECKING([how to link with libiconv]) 222 AC_MSG_RESULT([$LIBICONV]) 223 else 224 dnl If $LIBICONV didn't lead to a usable library, we don't need $INCICONV 225 dnl either. 226 CPPFLAGS="$am_save_CPPFLAGS" 227 LIBICONV= 228 LTLIBICONV= 229 fi 230 AC_SUBST([LIBICONV]) 231 AC_SUBST([LTLIBICONV]) 232]) 233 234dnl Define AM_ICONV using AC_DEFUN_ONCE, in order to avoid warnings like 235dnl "warning: AC_REQUIRE: `AM_ICONV' was expanded before it was required". 236dnl This is tricky because of the way 'aclocal' is implemented: 237dnl - It requires defining an auxiliary macro whose name ends in AC_DEFUN. 238dnl Otherwise aclocal's initial scan pass would miss the macro definition. 239dnl - It requires a line break inside the AC_DEFUN_ONCE and AC_DEFUN expansions. 240dnl Otherwise aclocal would emit many "Use of uninitialized value $1" 241dnl warnings. 242AC_DEFUN_ONCE([AM_ICONV], 243[ 244 AM_ICONV_LINK 245 if test "$am_cv_func_iconv" = yes; then 246 AC_CACHE_CHECK([whether iconv is compatible with its POSIX signature], 247 [gl_cv_iconv_nonconst], 248 [AC_COMPILE_IFELSE( 249 [AC_LANG_PROGRAM( 250 [[ 251#include <stdlib.h> 252#include <iconv.h> 253extern 254#ifdef __cplusplus 255"C" 256#endif 257size_t iconv (iconv_t cd, char * *inbuf, size_t *inbytesleft, char * *outbuf, size_t *outbytesleft); 258 ]], 259 [[]])], 260 [gl_cv_iconv_nonconst=yes], 261 [gl_cv_iconv_nonconst=no]) 262 ]) 263 else 264 dnl When compiling GNU libiconv on a system that does not have iconv yet, 265 dnl pick the POSIX compliant declaration without 'const'. 266 gl_cv_iconv_nonconst=yes 267 fi 268 if test $gl_cv_iconv_nonconst = yes; then 269 iconv_arg1="" 270 else 271 iconv_arg1="const" 272 fi 273 AC_DEFINE_UNQUOTED([ICONV_CONST], [$iconv_arg1], 274 [Define as const if the declaration of iconv() needs const.]) 275 dnl Also substitute ICONV_CONST in the gnulib generated <iconv.h>. 276 m4_ifdef([gl_ICONV_H_DEFAULTS], 277 [AC_REQUIRE([gl_ICONV_H_DEFAULTS]) 278 if test $gl_cv_iconv_nonconst != yes; then 279 ICONV_CONST="const" 280 fi 281 ]) 282]) 283