| 1 | # iconv.m4 serial 24
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| 2 | dnl Copyright (C) 2000-2002, 2007-2014, 2016-2021 Free Software Foundation,
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| 3 | dnl Inc.
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| 4 | dnl This file is free software; the Free Software Foundation
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| 5 | dnl gives unlimited permission to copy and/or distribute it,
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| 6 | dnl with or without modifications, as long as this notice is preserved.
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| 7 |
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| 8 | dnl From Bruno Haible.
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| 9 |
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| 10 | AC_PREREQ([2.64])
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| 11 |
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| 12 | dnl Note: AM_ICONV is documented in the GNU gettext manual
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| 13 | dnl <https://www.gnu.org/software/gettext/manual/html_node/AM_005fICONV.html>.
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| 14 | dnl Don't make changes that are incompatible with that documentation!
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| 15 |
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| 16 | AC_DEFUN([AM_ICONV_LINKFLAGS_BODY],
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| 17 | [
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| 18 | dnl Prerequisites of AC_LIB_LINKFLAGS_BODY.
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| 19 | AC_REQUIRE([AC_LIB_PREPARE_PREFIX])
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| 20 | AC_REQUIRE([AC_LIB_RPATH])
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| 21 |
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| 22 | dnl Search for libiconv and define LIBICONV, LTLIBICONV and INCICONV
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| 23 | dnl accordingly.
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| 24 | AC_LIB_LINKFLAGS_BODY([iconv])
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| 25 | ])
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| 26 |
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| 27 | AC_DEFUN([AM_ICONV_LINK],
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| 28 | [
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| 29 | dnl Some systems have iconv in libc, some have it in libiconv (OSF/1 and
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| 30 | dnl those with the standalone portable GNU libiconv installed).
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| 31 | AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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| 32 |
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| 33 | dnl Search for libiconv and define LIBICONV, LTLIBICONV and INCICONV
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| 34 | dnl accordingly.
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| 35 | AC_REQUIRE([AM_ICONV_LINKFLAGS_BODY])
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| 36 |
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| 37 | dnl Add $INCICONV to CPPFLAGS before performing the following checks,
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| 38 | dnl because if the user has installed libiconv and not disabled its use
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| 39 | dnl via --without-libiconv-prefix, he wants to use it. The first
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| 40 | dnl AC_LINK_IFELSE will then fail, the second AC_LINK_IFELSE will succeed.
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| 41 | am_save_CPPFLAGS="$CPPFLAGS"
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| 42 | AC_LIB_APPENDTOVAR([CPPFLAGS], [$INCICONV])
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| 43 |
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| 44 | AC_CACHE_CHECK([for iconv], [am_cv_func_iconv], [
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| 45 | am_cv_func_iconv="no, consider installing GNU libiconv"
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| 46 | am_cv_lib_iconv=no
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| 47 | AC_LINK_IFELSE(
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| 48 | [AC_LANG_PROGRAM(
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| 49 | [[
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| 50 | #include <stdlib.h>
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| 51 | #include <iconv.h>
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| 52 | ]],
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| 53 | [[iconv_t cd = iconv_open("","");
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| 54 | iconv(cd,NULL,NULL,NULL,NULL);
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| 55 | iconv_close(cd);]])],
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| 56 | [am_cv_func_iconv=yes])
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| 57 | if test "$am_cv_func_iconv" != yes; then
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| 58 | am_save_LIBS="$LIBS"
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| 59 | LIBS="$LIBS $LIBICONV"
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| 60 | AC_LINK_IFELSE(
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| 61 | [AC_LANG_PROGRAM(
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| 62 | [[
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| 63 | #include <stdlib.h>
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| 64 | #include <iconv.h>
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| 65 | ]],
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| 66 | [[iconv_t cd = iconv_open("","");
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| 67 | iconv(cd,NULL,NULL,NULL,NULL);
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| 68 | iconv_close(cd);]])],
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| 69 | [am_cv_lib_iconv=yes]
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| 70 | [am_cv_func_iconv=yes])
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| 71 | LIBS="$am_save_LIBS"
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| 72 | fi
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| 73 | ])
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| 74 | if test "$am_cv_func_iconv" = yes; then
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| 75 | AC_CACHE_CHECK([for working iconv], [am_cv_func_iconv_works], [
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| 76 | dnl This tests against bugs in AIX 5.1, AIX 6.1..7.1, HP-UX 11.11,
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| 77 | dnl Solaris 10.
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| 78 | am_save_LIBS="$LIBS"
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| 79 | if test $am_cv_lib_iconv = yes; then
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| 80 | LIBS="$LIBS $LIBICONV"
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| 81 | fi
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| 82 | am_cv_func_iconv_works=no
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| 83 | for ac_iconv_const in '' 'const'; do
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| 84 | AC_RUN_IFELSE(
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| 85 | [AC_LANG_PROGRAM(
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| 86 | [[
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| 87 | #include <iconv.h>
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| 88 | #include <string.h>
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| 89 |
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| 90 | #ifndef ICONV_CONST
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| 91 | # define ICONV_CONST $ac_iconv_const
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| 92 | #endif
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| 93 | ]],
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| 94 | [[int result = 0;
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| 95 | /* Test against AIX 5.1...7.2 bug: Failures are not distinguishable from
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| 96 | successful returns. This is even documented in
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| 97 | <https://www.ibm.com/support/knowledgecenter/ssw_aix_72/i_bostechref/iconv.html> */
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| 98 | {
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| 99 | iconv_t cd_utf8_to_88591 = iconv_open ("ISO8859-1", "UTF-8");
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| 100 | if (cd_utf8_to_88591 != (iconv_t)(-1))
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| 101 | {
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| 102 | static ICONV_CONST char input[] = "\342\202\254"; /* EURO SIGN */
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| 103 | char buf[10];
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| 104 | ICONV_CONST char *inptr = input;
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| 105 | size_t inbytesleft = strlen (input);
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| 106 | char *outptr = buf;
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| 107 | size_t outbytesleft = sizeof (buf);
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| 108 | size_t res = iconv (cd_utf8_to_88591,
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| 109 | &inptr, &inbytesleft,
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| 110 | &outptr, &outbytesleft);
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| 111 | if (res == 0)
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| 112 | result |= 1;
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| 113 | iconv_close (cd_utf8_to_88591);
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| 114 | }
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| 115 | }
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| 116 | /* Test against Solaris 10 bug: Failures are not distinguishable from
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| 117 | successful returns. */
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| 118 | {
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| 119 | iconv_t cd_ascii_to_88591 = iconv_open ("ISO8859-1", "646");
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| 120 | if (cd_ascii_to_88591 != (iconv_t)(-1))
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| 121 | {
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| 122 | static ICONV_CONST char input[] = "\263";
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| 123 | char buf[10];
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| 124 | ICONV_CONST char *inptr = input;
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| 125 | size_t inbytesleft = strlen (input);
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| 126 | char *outptr = buf;
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| 127 | size_t outbytesleft = sizeof (buf);
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| 128 | size_t res = iconv (cd_ascii_to_88591,
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| 129 | &inptr, &inbytesleft,
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| 130 | &outptr, &outbytesleft);
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| 131 | if (res == 0)
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| 132 | result |= 2;
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| 133 | iconv_close (cd_ascii_to_88591);
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| 134 | }
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| 135 | }
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| 136 | /* Test against AIX 6.1..7.1 bug: Buffer overrun. */
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| 137 | {
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| 138 | iconv_t cd_88591_to_utf8 = iconv_open ("UTF-8", "ISO-8859-1");
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| 139 | if (cd_88591_to_utf8 != (iconv_t)(-1))
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| 140 | {
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| 141 | static ICONV_CONST char input[] = "\304";
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| 142 | static char buf[2] = { (char)0xDE, (char)0xAD };
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| 143 | ICONV_CONST char *inptr = input;
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| 144 | size_t inbytesleft = 1;
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| 145 | char *outptr = buf;
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| 146 | size_t outbytesleft = 1;
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| 147 | size_t res = iconv (cd_88591_to_utf8,
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| 148 | &inptr, &inbytesleft,
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| 149 | &outptr, &outbytesleft);
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| 150 | if (res != (size_t)(-1) || outptr - buf > 1 || buf[1] != (char)0xAD)
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| 151 | result |= 4;
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| 152 | iconv_close (cd_88591_to_utf8);
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| 153 | }
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| 154 | }
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| 155 | #if 0 /* This bug could be worked around by the caller. */
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| 156 | /* Test against HP-UX 11.11 bug: Positive return value instead of 0. */
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| 157 | {
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| 158 | iconv_t cd_88591_to_utf8 = iconv_open ("utf8", "iso88591");
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| 159 | if (cd_88591_to_utf8 != (iconv_t)(-1))
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| 160 | {
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| 161 | static ICONV_CONST char input[] = "\304rger mit b\366sen B\374bchen ohne Augenma\337";
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| 162 | char buf[50];
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| 163 | ICONV_CONST char *inptr = input;
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| 164 | size_t inbytesleft = strlen (input);
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| 165 | char *outptr = buf;
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| 166 | size_t outbytesleft = sizeof (buf);
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| 167 | size_t res = iconv (cd_88591_to_utf8,
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| 168 | &inptr, &inbytesleft,
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| 169 | &outptr, &outbytesleft);
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| 170 | if ((int)res > 0)
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| 171 | result |= 8;
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| 172 | iconv_close (cd_88591_to_utf8);
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| 173 | }
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| 174 | }
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| 175 | #endif
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| 176 | /* Test against HP-UX 11.11 bug: No converter from EUC-JP to UTF-8 is
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| 177 | provided. */
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| 178 | {
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| 179 | /* Try standardized names. */
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| 180 | iconv_t cd1 = iconv_open ("UTF-8", "EUC-JP");
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| 181 | /* Try IRIX, OSF/1 names. */
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| 182 | iconv_t cd2 = iconv_open ("UTF-8", "eucJP");
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| 183 | /* Try AIX names. */
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| 184 | iconv_t cd3 = iconv_open ("UTF-8", "IBM-eucJP");
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| 185 | /* Try HP-UX names. */
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| 186 | iconv_t cd4 = iconv_open ("utf8", "eucJP");
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| 187 | if (cd1 == (iconv_t)(-1) && cd2 == (iconv_t)(-1)
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| 188 | && cd3 == (iconv_t)(-1) && cd4 == (iconv_t)(-1))
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| 189 | result |= 16;
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| 190 | if (cd1 != (iconv_t)(-1))
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| 191 | iconv_close (cd1);
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| 192 | if (cd2 != (iconv_t)(-1))
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| 193 | iconv_close (cd2);
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| 194 | if (cd3 != (iconv_t)(-1))
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| 195 | iconv_close (cd3);
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| 196 | if (cd4 != (iconv_t)(-1))
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| 197 | iconv_close (cd4);
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| 198 | }
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| 199 | return result;
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| 200 | ]])],
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| 201 | [am_cv_func_iconv_works=yes], ,
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| 202 | [case "$host_os" in
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| 203 | aix* | hpux*) am_cv_func_iconv_works="guessing no" ;;
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| 204 | *) am_cv_func_iconv_works="guessing yes" ;;
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| 205 | esac])
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| 206 | test "$am_cv_func_iconv_works" = no || break
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| 207 | done
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| 208 | LIBS="$am_save_LIBS"
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| 209 | ])
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| 210 | case "$am_cv_func_iconv_works" in
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| 211 | *no) am_func_iconv=no am_cv_lib_iconv=no ;;
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| 212 | *) am_func_iconv=yes ;;
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| 213 | esac
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| 214 | else
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| 215 | am_func_iconv=no am_cv_lib_iconv=no
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| 216 | fi
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| 217 | if test "$am_func_iconv" = yes; then
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| 218 | AC_DEFINE([HAVE_ICONV], [1],
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| 219 | [Define if you have the iconv() function and it works.])
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| 220 | fi
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| 221 | if test "$am_cv_lib_iconv" = yes; then
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| 222 | AC_MSG_CHECKING([how to link with libiconv])
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| 223 | AC_MSG_RESULT([$LIBICONV])
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| 224 | else
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| 225 | dnl If $LIBICONV didn't lead to a usable library, we don't need $INCICONV
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| 226 | dnl either.
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| 227 | CPPFLAGS="$am_save_CPPFLAGS"
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| 228 | LIBICONV=
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| 229 | LTLIBICONV=
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| 230 | fi
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| 231 | AC_SUBST([LIBICONV])
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| 232 | AC_SUBST([LTLIBICONV])
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| 233 | ])
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| 234 |
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| 235 | dnl Define AM_ICONV using AC_DEFUN_ONCE, in order to avoid warnings like
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| 236 | dnl "warning: AC_REQUIRE: `AM_ICONV' was expanded before it was required".
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| 237 | dnl This is tricky because of the way 'aclocal' is implemented:
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| 238 | dnl - It requires defining an auxiliary macro whose name ends in AC_DEFUN.
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| 239 | dnl Otherwise aclocal's initial scan pass would miss the macro definition.
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| 240 | dnl - It requires a line break inside the AC_DEFUN_ONCE and AC_DEFUN expansions.
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| 241 | dnl Otherwise aclocal would emit many "Use of uninitialized value $1"
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| 242 | dnl warnings.
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| 243 | AC_DEFUN_ONCE([AM_ICONV],
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| 244 | [
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| 245 | AM_ICONV_LINK
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| 246 | if test "$am_cv_func_iconv" = yes; then
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| 247 | AC_CACHE_CHECK([whether iconv is compatible with its POSIX signature],
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| 248 | [gl_cv_iconv_nonconst],
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| 249 | [AC_COMPILE_IFELSE(
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| 250 | [AC_LANG_PROGRAM(
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| 251 | [[
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| 252 | #include <stdlib.h>
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| 253 | #include <iconv.h>
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| 254 | extern
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| 255 | #ifdef __cplusplus
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| 256 | "C"
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| 257 | #endif
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| 258 | size_t iconv (iconv_t cd, char * *inbuf, size_t *inbytesleft, char * *outbuf, size_t *outbytesleft);
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| 259 | ]],
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| 260 | [[]])],
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| 261 | [gl_cv_iconv_nonconst=yes],
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| 262 | [gl_cv_iconv_nonconst=no])
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| 263 | ])
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| 264 | else
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| 265 | dnl When compiling GNU libiconv on a system that does not have iconv yet,
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| 266 | dnl pick the POSIX compliant declaration without 'const'.
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| 267 | gl_cv_iconv_nonconst=yes
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| 268 | fi
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| 269 | if test $gl_cv_iconv_nonconst = yes; then
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| 270 | iconv_arg1=""
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| 271 | else
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| 272 | iconv_arg1="const"
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| 273 | fi
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| 274 | AC_DEFINE_UNQUOTED([ICONV_CONST], [$iconv_arg1],
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| 275 | [Define as const if the declaration of iconv() needs const.])
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| 276 | dnl Also substitute ICONV_CONST in the gnulib generated <iconv.h>.
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| 277 | m4_ifdef([gl_ICONV_H_DEFAULTS],
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| 278 | [AC_REQUIRE([gl_ICONV_H_DEFAULTS])
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| 279 | if test $gl_cv_iconv_nonconst != yes; then
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| 280 | ICONV_CONST="const"
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| 281 | fi
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| 282 | ])
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| 283 | ])
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