1 # libunistring.m4 serial 8
2 dnl Copyright (C) 2009-2010 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
8 dnl Searches for an installed libunistring.
9 dnl If found, it sets and AC_SUBSTs HAVE_LIBUNISTRING=yes and the LIBUNISTRING
10 dnl and LTLIBUNISTRING variables, sets the LIBUNISTRING_VERSION variable, and
11 dnl augments the CPPFLAGS variable, and #defines HAVE_LIBUNISTRING to 1.
12 dnl Otherwise, it sets and AC_SUBSTs HAVE_LIBUNISTRING=no and LIBUNISTRING and
13 dnl LTLIBUNISTRING to empty.
15 dnl Define gl_LIBUNISTRING using AC_DEFUN_ONCE for Autoconf >= 2.64, in order
16 dnl to avoid warnings like
17 dnl "warning: AC_REQUIRE: `gl_LIBUNISTRING' was expanded before it was required".
18 dnl This is tricky because of the way 'aclocal' is implemented:
19 dnl - It requires defining an auxiliary macro whose name ends in AC_DEFUN.
20 dnl Otherwise aclocal's initial scan pass would miss the macro definition.
21 dnl - It requires a line break inside the AC_DEFUN_ONCE and AC_DEFUN expansions.
22 dnl Otherwise aclocal would emit many "Use of uninitialized value $1"
24 m4_define([gl_libunistring_AC_DEFUN],
25 m4_version_prereq([2.64],
30 gl_libunistring_AC_DEFUN([gl_LIBUNISTRING],
32 AC_BEFORE([$0], [gl_LIBUNISTRING_LIBSOURCE])
33 AC_BEFORE([$0], [gl_LIBUNISTRING_LIBHEADER])
34 AC_BEFORE([$0], [gl_LIBUNISTRING_LIB_PREPARE])
36 m4_ifdef([gl_LIBUNISTRING_OPTIONAL],
38 AC_MSG_CHECKING([whether included libunistring is requested])
39 AC_ARG_WITH([included-libunistring],
40 [ --with-included-libunistring use the libunistring parts included here],
41 [gl_libunistring_force_included=$withval],
42 [gl_libunistring_force_included=no])
43 AC_MSG_RESULT([$gl_libunistring_force_included])
44 gl_libunistring_use_included="$gl_libunistring_force_included"
45 if test "$gl_libunistring_use_included" = yes; then
46 dnl Assume that libunistring is not installed until some other macro
47 dnl explicitly invokes gl_LIBUNISTRING_CORE.
48 if test -z "$HAVE_LIBUNISTRING"; then
55 if test $HAVE_LIBUNISTRING = no; then
56 gl_libunistring_use_included=yes
62 [gl_LIBUNISTRING_CORE])
65 AC_DEFUN([gl_LIBUNISTRING_CORE],
67 AC_REQUIRE([AM_ICONV])
68 if test -n "$LIBICONV"; then
69 dnl First, try to link without -liconv. libunistring often depends on
70 dnl libiconv, but we don't know (and often don't need to know) where
71 dnl libiconv is installed.
72 AC_LIB_HAVE_LINKFLAGS([unistring], [],
73 [#include <uniconv.h>], [u8_strconv_from_locale((char*)0);],
74 [no, trying again together with libiconv])
75 if test "$ac_cv_libunistring" != yes; then
76 dnl Second try, with -liconv.
77 dnl We have to erase the cached result of the first AC_LIB_HAVE_LINKFLAGS
78 dnl invocation, otherwise the second one will not be run.
79 unset ac_cv_libunistring
80 glus_save_LIBS="$LIBS"
81 LIBS="$LIBS $LIBICONV"
82 AC_LIB_HAVE_LINKFLAGS([unistring], [],
83 [#include <uniconv.h>], [u8_strconv_from_locale((char*)0);],
84 [no, consider installing GNU libunistring])
85 if test -n "$LIBUNISTRING"; then
86 LIBUNISTRING="$LIBUNISTRING $LIBICONV"
87 LTLIBUNISTRING="$LTLIBUNISTRING $LTLIBICONV"
89 LIBS="$glus_save_LIBS"
92 AC_LIB_HAVE_LINKFLAGS([unistring], [],
93 [#include <uniconv.h>], [u8_strconv_from_locale((char*)0);],
94 [no, consider installing GNU libunistring])
96 if test $HAVE_LIBUNISTRING = yes; then
97 dnl Determine the installed version.
98 AC_CACHE_CHECK([for libunistring version], [gl_cv_libunistring_version],
99 [AC_COMPUTE_INT([gl_libunistring_hexversion],
100 [_LIBUNISTRING_VERSION],
101 [#include <unistring/version.h>])
102 dnl Versions <= 0.9.3 had a hexversion of 0x0009.
103 dnl Use other tests to distinguish them.
104 if test $gl_libunistring_hexversion = 9; then
105 dnl Version 0.9.2 introduced the header <unistring/cdefs.h>.
106 AC_TRY_COMPILE([#include <unistring/cdefs.h>], ,
107 [gl_cv_libunistring_version092=true],
108 [gl_cv_libunistring_version092=false]);
109 if $gl_cv_libunistring_version092; then
110 dnl Version 0.9.3 changed a comment in <unistr.h>.
111 gl_ABSOLUTE_HEADER_ONE([unistr.h])
112 if test -n "$gl_cv_absolute_unistr_h" \
113 && grep 'Copy no more than N units of SRC to DEST. Return a pointer' $gl_cv_absolute_unistr_h > /dev/null; then
114 dnl Detected version 0.9.3.
115 gl_libunistring_hexversion=2307
117 dnl Detected version 0.9.2.
118 gl_libunistring_hexversion=2306
121 dnl Version 0.9.1 introduced the type casing_suffix_context_t.
122 AC_TRY_COMPILE([#include <unicase.h>
123 casing_suffix_context_t ct;], ,
124 [gl_cv_libunistring_version091=true],
125 [gl_cv_libunistring_version091=false])
126 if $gl_cv_libunistring_version091; then
127 dnl Detected version 0.9.1.
128 gl_libunistring_hexversion=2305
130 dnl Detected version 0.9.
131 gl_libunistring_hexversion=2304
135 dnl Transform into the usual major.minor.subminor notation.
136 gl_libunistring_major=`expr $gl_libunistring_hexversion / 65536`
137 gl_libunistring_minor=`expr $gl_libunistring_hexversion / 256 % 256`
138 gl_libunistring_subminor=`expr $gl_libunistring_hexversion % 256`
139 gl_cv_libunistring_version="$gl_libunistring_major.$gl_libunistring_minor.$gl_libunistring_subminor"
141 LIBUNISTRING_VERSION="$gl_cv_libunistring_version"