m4/libunistring.m4

   1 # libunistring.m4 serial 6
   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 AC_DEFUN([gl_LIBUNISTRING],
  16 [
  17   AC_BEFORE([$0], [gl_LIBUNISTRING_LIBSOURCE])
  18   AC_BEFORE([$0], [gl_LIBUNISTRING_LIBHEADER])
  19   AC_BEFORE([$0], [gl_LIBUNISTRING_LIB_PREPARE])
  20
  21   m4_ifdef([gl_LIBUNISTRING_OPTIONAL],
  22     [
  23       AC_MSG_CHECKING([whether included libunistring is requested])
  24       AC_ARG_WITH([included-libunistring],
  25         [  --with-included-libunistring  use the libunistring parts included here],
  26         [gl_libunistring_force_included=$withval],
  27         [gl_libunistring_force_included=no])
  28       AC_MSG_RESULT([$gl_libunistring_force_included])
  29       gl_libunistring_use_included="$gl_libunistring_force_included"
  30       if test "$gl_libunistring_use_included" = yes; then
  31         dnl Assume that libunistring is not installed until some other macro
  32         dnl explicitly invokes gl_LIBUNISTRING_CORE.
  33         if test -z "$HAVE_LIBUNISTRING"; then
  34           HAVE_LIBUNISTRING=no
  35         fi
  36         LIBUNISTRING=
  37         LTLIBUNISTRING=
  38       else
  39         gl_LIBUNISTRING_CORE
  40         if test $HAVE_LIBUNISTRING = no; then
  41           gl_libunistring_use_included=yes
  42           LIBUNISTRING=
  43           LTLIBUNISTRING=
  44         fi
  45       fi
  46     ],
  47     [gl_LIBUNISTRING_CORE])
  48 ])
  49
  50 AC_DEFUN([gl_LIBUNISTRING_CORE],
  51 [
  52   AC_REQUIRE([AM_ICONV])
  53   if test -n "$LIBICONV"; then
  54     dnl First, try to link without -liconv. libunistring often depends on
  55     dnl libiconv, but we don't know (and often don't need to know) where
  56     dnl libiconv is installed.
  57     AC_LIB_HAVE_LINKFLAGS([unistring], [],
  58       [#include <uniconv.h>], [u8_strconv_from_locale((char*)0);],
  59       [no, trying again together with libiconv])
  60     if test "$ac_cv_libunistring" != yes; then
  61       dnl Second try, with -liconv.
  62       dnl We have to erase the cached result of the first AC_LIB_HAVE_LINKFLAGS
  63       dnl invocation, otherwise the second one will not be run.
  64       unset ac_cv_libunistring
  65       glus_save_LIBS="$LIBS"
  66       LIBS="$LIBS $LIBICONV"
  67       AC_LIB_HAVE_LINKFLAGS([unistring], [],
  68         [#include <uniconv.h>], [u8_strconv_from_locale((char*)0);],
  69         [no, consider installing GNU libunistring])
  70       if test -n "$LIBUNISTRING"; then
  71         LIBUNISTRING="$LIBUNISTRING $LIBICONV"
  72         LTLIBUNISTRING="$LTLIBUNISTRING $LTLIBICONV"
  73       fi
  74       LIBS="$glus_save_LIBS"
  75     fi
  76   else
  77     AC_LIB_HAVE_LINKFLAGS([unistring], [],
  78       [#include <uniconv.h>], [u8_strconv_from_locale((char*)0);],
  79       [no, consider installing GNU libunistring])
  80   fi
  81   if test $HAVE_LIBUNISTRING = yes; then
  82     dnl Determine the installed version.
  83     AC_CACHE_CHECK([for libunistring version], [gl_cv_libunistring_version],
  84       [AC_COMPUTE_INT([gl_libunistring_hexversion],
  85                       [_LIBUNISTRING_VERSION],
  86                       [#include <unistring/version.h>])
  87        dnl Versions <= 0.9.3 had a hexversion of 0x0009.
  88        dnl Use other tests to distinguish them.
  89        if test $gl_libunistring_hexversion = 9; then
  90          dnl Version 0.9.2 introduced the header <unistring/cdefs.h>.
  91          AC_TRY_COMPILE([#include <unistring/cdefs.h>], ,
  92            [gl_cv_libunistring_version092=true],
  93            [gl_cv_libunistring_version092=false]);
  94          if $gl_cv_libunistring_version092; then
  95            dnl Version 0.9.3 changed a comment in <unistr.h>.
  96            gl_ABSOLUTE_HEADER_ONE([unistr.h])
  97            if test -n "$gl_cv_absolute_unistr_h" \
  98               && grep 'Copy no more than N units of SRC to DEST.  Return a pointer' $gl_cv_absolute_unistr_h > /dev/null; then
  99              dnl Detected version 0.9.3.
 100              gl_libunistring_hexversion=2307
 101            else
 102              dnl Detected version 0.9.2.
 103              gl_libunistring_hexversion=2306
 104            fi
 105          else
 106            dnl Version 0.9.1 introduced the type casing_suffix_context_t.
 107            AC_TRY_COMPILE([#include <unicase.h>
 108                            casing_suffix_context_t ct;], ,
 109              [gl_cv_libunistring_version091=true],
 110              [gl_cv_libunistring_version091=false])
 111            if $gl_cv_libunistring_version091; then
 112              dnl Detected version 0.9.1.
 113              gl_libunistring_hexversion=2305
 114            else
 115              dnl Detected version 0.9.
 116              gl_libunistring_hexversion=2304
 117            fi
 118          fi
 119        fi
 120        dnl Transform into the usual major.minor.subminor notation.
 121        gl_libunistring_major=`expr $gl_libunistring_hexversion / 65536`
 122        gl_libunistring_minor=`expr $gl_libunistring_hexversion / 256 % 256`
 123        gl_libunistring_subminor=`expr $gl_libunistring_hexversion % 256`
 124        gl_cv_libunistring_version="$gl_libunistring_major.$gl_libunistring_minor.$gl_libunistring_subminor"
 125       ])
 126     LIBUNISTRING_VERSION="$gl_cv_libunistring_version"
 127   fi
 128 ])