3 dnl Copyright (C) 2009-2024 Free Software Foundation, 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 dnl This file is offered as-is, without any warranty.
12 dnl Searches for an installed libunistring.
13 dnl If found, it sets and AC_SUBSTs HAVE_LIBUNISTRING=yes and the LIBUNISTRING
14 dnl and LTLIBUNISTRING variables, sets the LIBUNISTRING_VERSION variable, and
15 dnl augments the CPPFLAGS variable, and #defines HAVE_LIBUNISTRING to 1.
16 dnl Otherwise, it sets and AC_SUBSTs HAVE_LIBUNISTRING=no and LIBUNISTRING and
17 dnl LTLIBUNISTRING to empty.
19 dnl Define gl_LIBUNISTRING using AC_DEFUN_ONCE, in order dnl to avoid warnings
21 dnl "warning: AC_REQUIRE: `gl_LIBUNISTRING' was expanded before it was required".
22 dnl This is tricky because of the way 'aclocal' is implemented:
23 dnl - It requires defining an auxiliary macro whose name ends in AC_DEFUN.
24 dnl Otherwise aclocal's initial scan pass would miss the macro definition.
25 dnl - It requires a line break inside the AC_DEFUN_ONCE and AC_DEFUN expansions.
26 dnl Otherwise aclocal would emit many "Use of uninitialized value $1"
28 AC_DEFUN_ONCE([gl_LIBUNISTRING],
30 AC_BEFORE([$0], [gl_LIBUNISTRING_MODULE])
31 AC_BEFORE([$0], [gl_LIBUNISTRING_LIBHEADER])
32 AC_BEFORE([$0], [gl_LIBUNISTRING_LIB_PREPARE])
34 m4_ifdef([gl_LIBUNISTRING_OPTIONAL],
36 AC_MSG_CHECKING([whether included libunistring is requested])
37 AC_ARG_WITH([included-libunistring],
38 [ --with-included-libunistring use the libunistring parts included here],
39 [gl_libunistring_force_included=$withval],
40 [gl_libunistring_force_included=no])
41 AC_MSG_RESULT([$gl_libunistring_force_included])
42 gl_libunistring_use_included="$gl_libunistring_force_included"
43 if test "$gl_libunistring_use_included" = yes; then
44 dnl Assume that libunistring is not installed until some other macro
45 dnl explicitly invokes gl_LIBUNISTRING_CORE.
46 if test -z "$HAVE_LIBUNISTRING"; then
53 if test $HAVE_LIBUNISTRING = no; then
54 gl_libunistring_use_included=yes
60 [gl_LIBUNISTRING_CORE])
63 AC_DEFUN([gl_LIBUNISTRING_CORE],
65 AC_REQUIRE([AM_ICONV])
66 if test -n "$LIBICONV"; then
67 dnl First, try to link without -liconv. libunistring often depends on
68 dnl libiconv, but we don't know (and often don't need to know) where
69 dnl libiconv is installed.
70 AC_LIB_HAVE_LINKFLAGS([unistring], [],
71 [#include <uniconv.h>], [u8_strconv_from_locale((char*)0);],
72 [no, trying again together with libiconv])
73 if test "$ac_cv_libunistring" != yes; then
74 dnl Second try, with -liconv.
75 dnl We have to erase the cached result of the first AC_LIB_HAVE_LINKFLAGS
76 dnl invocation, otherwise the second one will not be run.
77 unset ac_cv_libunistring
78 glus_saved_LIBS="$LIBS"
79 LIBS="$LIBS $LIBICONV"
80 AC_LIB_HAVE_LINKFLAGS([unistring], [],
81 [#include <uniconv.h>], [u8_strconv_from_locale((char*)0);],
82 [no, consider installing GNU libunistring])
83 if test -n "$LIBUNISTRING"; then
84 LIBUNISTRING="$LIBUNISTRING $LIBICONV"
85 LTLIBUNISTRING="$LTLIBUNISTRING $LTLIBICONV"
87 LIBS="$glus_saved_LIBS"
90 AC_LIB_HAVE_LINKFLAGS([unistring], [],
91 [#include <uniconv.h>], [u8_strconv_from_locale((char*)0);],
92 [no, consider installing GNU libunistring])
94 if test $HAVE_LIBUNISTRING = yes; then
95 dnl Determine the installed version.
96 AC_CACHE_CHECK([for libunistring version], [gl_cv_libunistring_version],
97 [AC_COMPUTE_INT([gl_libunistring_hexversion],
98 [_LIBUNISTRING_VERSION],
99 [#include <unistring/version.h>])
100 dnl Versions <= 0.9.3 had a hexversion of 0x0009.
101 dnl Use other tests to distinguish them.
102 if test $gl_libunistring_hexversion = 9; then
103 dnl Version 0.9.2 introduced the header <unistring/cdefs.h>.
105 [AC_LANG_PROGRAM([[#include <unistring/cdefs.h>]], [[]])],
106 [gl_cv_libunistring_version092=true],
107 [gl_cv_libunistring_version092=false])
108 if $gl_cv_libunistring_version092; then
109 dnl Version 0.9.3 changed a comment in <unistr.h>.
110 gl_ABSOLUTE_HEADER_ONE([unistr.h])
111 if test -n "$gl_cv_absolute_unistr_h" \
112 && grep 'Copy no more than N units of SRC to DEST. Return a pointer' $gl_cv_absolute_unistr_h > /dev/null; then
113 dnl Detected version 0.9.3.
114 gl_libunistring_hexversion=2307
116 dnl Detected version 0.9.2.
117 gl_libunistring_hexversion=2306
120 dnl Version 0.9.1 introduced the type casing_suffix_context_t.
123 [[#include <unicase.h>
124 casing_suffix_context_t ct;]],
126 [gl_cv_libunistring_version091=true],
127 [gl_cv_libunistring_version091=false])
128 if $gl_cv_libunistring_version091; then
129 dnl Detected version 0.9.1.
130 gl_libunistring_hexversion=2305
132 dnl Detected version 0.9.
133 gl_libunistring_hexversion=2304
137 dnl Transform into the usual major.minor.subminor notation.
138 gl_libunistring_major=`expr $gl_libunistring_hexversion / 65536`
139 gl_libunistring_minor=`expr $gl_libunistring_hexversion / 256 % 256`
140 gl_libunistring_subminor=`expr $gl_libunistring_hexversion % 256`
141 gl_cv_libunistring_version="$gl_libunistring_major.$gl_libunistring_minor.$gl_libunistring_subminor"
143 LIBUNISTRING_VERSION="$gl_cv_libunistring_version"