iconv.m4 (9542B)
1 # iconv.m4 serial 24 2 dnl Copyright (C) 2000-2002, 2007-2014, 2016-2021 Free Software Foundation, 3 dnl Inc. 4 dnl This file is free software; the Free Software Foundation 5 dnl gives unlimited permission to copy and/or distribute it, 6 dnl with or without modifications, as long as this notice is preserved. 7 8 dnl From Bruno Haible. 9 10 AC_PREREQ([2.64]) 11 12 dnl Note: AM_ICONV is documented in the GNU gettext manual 13 dnl <https://www.gnu.org/software/gettext/manual/html_node/AM_005fICONV.html>. 14 dnl Don't make changes that are incompatible with that documentation! 15 16 AC_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 27 AC_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...7.2 bug: Failures are not distinguishable from 96 successful returns. This is even documented in 97 <https://www.ibm.com/support/knowledgecenter/ssw_aix_72/i_bostechref/iconv.html> */ 98 { 99 iconv_t cd_utf8_to_88591 = iconv_open ("ISO8859-1", "UTF-8"); 100 if (cd_utf8_to_88591 != (iconv_t)(-1)) 101 { 102 static ICONV_CONST char input[] = "\342\202\254"; /* EURO SIGN */ 103 char buf[10]; 104 ICONV_CONST char *inptr = input; 105 size_t inbytesleft = strlen (input); 106 char *outptr = buf; 107 size_t outbytesleft = sizeof (buf); 108 size_t res = iconv (cd_utf8_to_88591, 109 &inptr, &inbytesleft, 110 &outptr, &outbytesleft); 111 if (res == 0) 112 result |= 1; 113 iconv_close (cd_utf8_to_88591); 114 } 115 } 116 /* Test against Solaris 10 bug: Failures are not distinguishable from 117 successful returns. */ 118 { 119 iconv_t cd_ascii_to_88591 = iconv_open ("ISO8859-1", "646"); 120 if (cd_ascii_to_88591 != (iconv_t)(-1)) 121 { 122 static ICONV_CONST char input[] = "\263"; 123 char buf[10]; 124 ICONV_CONST char *inptr = input; 125 size_t inbytesleft = strlen (input); 126 char *outptr = buf; 127 size_t outbytesleft = sizeof (buf); 128 size_t res = iconv (cd_ascii_to_88591, 129 &inptr, &inbytesleft, 130 &outptr, &outbytesleft); 131 if (res == 0) 132 result |= 2; 133 iconv_close (cd_ascii_to_88591); 134 } 135 } 136 /* Test against AIX 6.1..7.1 bug: Buffer overrun. */ 137 { 138 iconv_t cd_88591_to_utf8 = iconv_open ("UTF-8", "ISO-8859-1"); 139 if (cd_88591_to_utf8 != (iconv_t)(-1)) 140 { 141 static ICONV_CONST char input[] = "\304"; 142 static char buf[2] = { (char)0xDE, (char)0xAD }; 143 ICONV_CONST char *inptr = input; 144 size_t inbytesleft = 1; 145 char *outptr = buf; 146 size_t outbytesleft = 1; 147 size_t res = iconv (cd_88591_to_utf8, 148 &inptr, &inbytesleft, 149 &outptr, &outbytesleft); 150 if (res != (size_t)(-1) || outptr - buf > 1 || buf[1] != (char)0xAD) 151 result |= 4; 152 iconv_close (cd_88591_to_utf8); 153 } 154 } 155 #if 0 /* This bug could be worked around by the caller. */ 156 /* Test against HP-UX 11.11 bug: Positive return value instead of 0. */ 157 { 158 iconv_t cd_88591_to_utf8 = iconv_open ("utf8", "iso88591"); 159 if (cd_88591_to_utf8 != (iconv_t)(-1)) 160 { 161 static ICONV_CONST char input[] = "\304rger mit b\366sen B\374bchen ohne Augenma\337"; 162 char buf[50]; 163 ICONV_CONST char *inptr = input; 164 size_t inbytesleft = strlen (input); 165 char *outptr = buf; 166 size_t outbytesleft = sizeof (buf); 167 size_t res = iconv (cd_88591_to_utf8, 168 &inptr, &inbytesleft, 169 &outptr, &outbytesleft); 170 if ((int)res > 0) 171 result |= 8; 172 iconv_close (cd_88591_to_utf8); 173 } 174 } 175 #endif 176 /* Test against HP-UX 11.11 bug: No converter from EUC-JP to UTF-8 is 177 provided. */ 178 { 179 /* Try standardized names. */ 180 iconv_t cd1 = iconv_open ("UTF-8", "EUC-JP"); 181 /* Try IRIX, OSF/1 names. */ 182 iconv_t cd2 = iconv_open ("UTF-8", "eucJP"); 183 /* Try AIX names. */ 184 iconv_t cd3 = iconv_open ("UTF-8", "IBM-eucJP"); 185 /* Try HP-UX names. */ 186 iconv_t cd4 = iconv_open ("utf8", "eucJP"); 187 if (cd1 == (iconv_t)(-1) && cd2 == (iconv_t)(-1) 188 && cd3 == (iconv_t)(-1) && cd4 == (iconv_t)(-1)) 189 result |= 16; 190 if (cd1 != (iconv_t)(-1)) 191 iconv_close (cd1); 192 if (cd2 != (iconv_t)(-1)) 193 iconv_close (cd2); 194 if (cd3 != (iconv_t)(-1)) 195 iconv_close (cd3); 196 if (cd4 != (iconv_t)(-1)) 197 iconv_close (cd4); 198 } 199 return result; 200 ]])], 201 [am_cv_func_iconv_works=yes], , 202 [case "$host_os" in 203 aix* | hpux*) am_cv_func_iconv_works="guessing no" ;; 204 *) am_cv_func_iconv_works="guessing yes" ;; 205 esac]) 206 test "$am_cv_func_iconv_works" = no || break 207 done 208 LIBS="$am_save_LIBS" 209 ]) 210 case "$am_cv_func_iconv_works" in 211 *no) am_func_iconv=no am_cv_lib_iconv=no ;; 212 *) am_func_iconv=yes ;; 213 esac 214 else 215 am_func_iconv=no am_cv_lib_iconv=no 216 fi 217 if test "$am_func_iconv" = yes; then 218 AC_DEFINE([HAVE_ICONV], [1], 219 [Define if you have the iconv() function and it works.]) 220 fi 221 if test "$am_cv_lib_iconv" = yes; then 222 AC_MSG_CHECKING([how to link with libiconv]) 223 AC_MSG_RESULT([$LIBICONV]) 224 else 225 dnl If $LIBICONV didn't lead to a usable library, we don't need $INCICONV 226 dnl either. 227 CPPFLAGS="$am_save_CPPFLAGS" 228 LIBICONV= 229 LTLIBICONV= 230 fi 231 AC_SUBST([LIBICONV]) 232 AC_SUBST([LTLIBICONV]) 233 ]) 234 235 dnl Define AM_ICONV using AC_DEFUN_ONCE, in order to avoid warnings like 236 dnl "warning: AC_REQUIRE: `AM_ICONV' was expanded before it was required". 237 dnl This is tricky because of the way 'aclocal' is implemented: 238 dnl - It requires defining an auxiliary macro whose name ends in AC_DEFUN. 239 dnl Otherwise aclocal's initial scan pass would miss the macro definition. 240 dnl - It requires a line break inside the AC_DEFUN_ONCE and AC_DEFUN expansions. 241 dnl Otherwise aclocal would emit many "Use of uninitialized value $1" 242 dnl warnings. 243 AC_DEFUN_ONCE([AM_ICONV], 244 [ 245 AM_ICONV_LINK 246 if test "$am_cv_func_iconv" = yes; then 247 AC_CACHE_CHECK([whether iconv is compatible with its POSIX signature], 248 [gl_cv_iconv_nonconst], 249 [AC_COMPILE_IFELSE( 250 [AC_LANG_PROGRAM( 251 [[ 252 #include <stdlib.h> 253 #include <iconv.h> 254 extern 255 #ifdef __cplusplus 256 "C" 257 #endif 258 size_t iconv (iconv_t cd, char * *inbuf, size_t *inbytesleft, char * *outbuf, size_t *outbytesleft); 259 ]], 260 [[]])], 261 [gl_cv_iconv_nonconst=yes], 262 [gl_cv_iconv_nonconst=no]) 263 ]) 264 else 265 dnl When compiling GNU libiconv on a system that does not have iconv yet, 266 dnl pick the POSIX compliant declaration without 'const'. 267 gl_cv_iconv_nonconst=yes 268 fi 269 if test $gl_cv_iconv_nonconst = yes; then 270 iconv_arg1="" 271 else 272 iconv_arg1="const" 273 fi 274 AC_DEFINE_UNQUOTED([ICONV_CONST], [$iconv_arg1], 275 [Define as const if the declaration of iconv() needs const.]) 276 dnl Also substitute ICONV_CONST in the gnulib generated <iconv.h>. 277 m4_ifdef([gl_ICONV_H_DEFAULTS], 278 [AC_REQUIRE([gl_ICONV_H_DEFAULTS]) 279 if test $gl_cv_iconv_nonconst != yes; then 280 ICONV_CONST="const" 281 fi 282 ]) 283 ])