m4/libunistring.m4

   1 # libunistring.m4 serial 7
   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.
   6
   7 dnl gl_LIBUNISTRING
   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.
  14
  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 m4_version_prereq([2.64],[AC_DEFUN_ONCE],[AC_DEFUN])([gl_LIBUNISTRING],
  19 [
  20   AC_BEFORE([$0], [gl_LIBUNISTRING_LIBSOURCE])
  21   AC_BEFORE([$0], [gl_LIBUNISTRING_LIBHEADER])
  22   AC_BEFORE([$0], [gl_LIBUNISTRING_LIB_PREPARE])
  23
  24   m4_ifdef([gl_LIBUNISTRING_OPTIONAL],
  25     [
  26       AC_MSG_CHECKING([whether included libunistring is requested])
  27       AC_ARG_WITH([included-libunistring],
  28         [  --with-included-libunistring  use the libunistring parts included here],
  29         [gl_libunistring_force_included=$withval],
  30         [gl_libunistring_force_included=no])
  31       AC_MSG_RESULT([$gl_libunistring_force_included])
  32       gl_libunistring_use_included="$gl_libunistring_force_included"
  33       if test "$gl_libunistring_use_included" = yes; then
  34         dnl Assume that libunistring is not installed until some other macro
  35         dnl explicitly invokes gl_LIBUNISTRING_CORE.
  36         if test -z "$HAVE_LIBUNISTRING"; then
  37           HAVE_LIBUNISTRING=no
  38         fi
  39         LIBUNISTRING=
  40         LTLIBUNISTRING=
  41       else
  42         gl_LIBUNISTRING_CORE
  43         if test $HAVE_LIBUNISTRING = no; then
  44           gl_libunistring_use_included=yes
  45           LIBUNISTRING=
  46           LTLIBUNISTRING=
  47         fi
  48       fi
  49     ],
  50     [gl_LIBUNISTRING_CORE])
  51 ])
  52
  53 AC_DEFUN([gl_LIBUNISTRING_CORE],
  54 [
  55   AC_REQUIRE([AM_ICONV])
  56   if test -n "$LIBICONV"; then
  57     dnl First, try to link without -liconv. libunistring often depends on
  58     dnl libiconv, but we don't know (and often don't need to know) where
  59     dnl libiconv is installed.
  60     AC_LIB_HAVE_LINKFLAGS([unistring], [],
  61       [#include <uniconv.h>], [u8_strconv_from_locale((char*)0);],
  62       [no, trying again together with libiconv])
  63     if test "$ac_cv_libunistring" != yes; then
  64       dnl Second try, with -liconv.
  65       dnl We have to erase the cached result of the first AC_LIB_HAVE_LINKFLAGS
  66       dnl invocation, otherwise the second one will not be run.
  67       unset ac_cv_libunistring
  68       glus_save_LIBS="$LIBS"
  69       LIBS="$LIBS $LIBICONV"
  70       AC_LIB_HAVE_LINKFLAGS([unistring], [],
  71         [#include <uniconv.h>], [u8_strconv_from_locale((char*)0);],
  72         [no, consider installing GNU libunistring])
  73       if test -n "$LIBUNISTRING"; then
  74         LIBUNISTRING="$LIBUNISTRING $LIBICONV"
  75         LTLIBUNISTRING="$LTLIBUNISTRING $LTLIBICONV"
  76       fi
  77       LIBS="$glus_save_LIBS"
  78     fi
  79   else
  80     AC_LIB_HAVE_LINKFLAGS([unistring], [],
  81       [#include <uniconv.h>], [u8_strconv_from_locale((char*)0);],
  82       [no, consider installing GNU libunistring])
  83   fi
  84   if test $HAVE_LIBUNISTRING = yes; then
  85     dnl Determine the installed version.
  86     AC_CACHE_CHECK([for libunistring version], [gl_cv_libunistring_version],
  87       [AC_COMPUTE_INT([gl_libunistring_hexversion],
  88                       [_LIBUNISTRING_VERSION],
  89                       [#include <unistring/version.h>])
  90        dnl Versions <= 0.9.3 had a hexversion of 0x0009.
  91        dnl Use other tests to distinguish them.
  92        if test $gl_libunistring_hexversion = 9; then
  93          dnl Version 0.9.2 introduced the header <unistring/cdefs.h>.
  94          AC_TRY_COMPILE([#include <unistring/cdefs.h>], ,
  95            [gl_cv_libunistring_version092=true],
  96            [gl_cv_libunistring_version092=false]);
  97          if $gl_cv_libunistring_version092; then
  98            dnl Version 0.9.3 changed a comment in <unistr.h>.
  99            gl_ABSOLUTE_HEADER_ONE([unistr.h])
 100            if test -n "$gl_cv_absolute_unistr_h" \
 101               && grep 'Copy no more than N units of SRC to DEST.  Return a pointer' $gl_cv_absolute_unistr_h > /dev/null; then
 102              dnl Detected version 0.9.3.
 103              gl_libunistring_hexversion=2307
 104            else
 105              dnl Detected version 0.9.2.
 106              gl_libunistring_hexversion=2306
 107            fi
 108          else
 109            dnl Version 0.9.1 introduced the type casing_suffix_context_t.
 110            AC_TRY_COMPILE([#include <unicase.h>
 111                            casing_suffix_context_t ct;], ,
 112              [gl_cv_libunistring_version091=true],
 113              [gl_cv_libunistring_version091=false])
 114            if $gl_cv_libunistring_version091; then
 115              dnl Detected version 0.9.1.
 116              gl_libunistring_hexversion=2305
 117            else
 118              dnl Detected version 0.9.
 119              gl_libunistring_hexversion=2304
 120            fi
 121          fi
 122        fi
 123        dnl Transform into the usual major.minor.subminor notation.
 124        gl_libunistring_major=`expr $gl_libunistring_hexversion / 65536`
 125        gl_libunistring_minor=`expr $gl_libunistring_hexversion / 256 % 256`
 126        gl_libunistring_subminor=`expr $gl_libunistring_hexversion % 256`
 127        gl_cv_libunistring_version="$gl_libunistring_major.$gl_libunistring_minor.$gl_libunistring_subminor"
 128       ])
 129     LIBUNISTRING_VERSION="$gl_cv_libunistring_version"
 130   fi
 131 ])