m4/libunistring.m4

   1 # libunistring.m4 serial 9
   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 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"
  23 dnl   warnings.
  24 m4_define([gl_libunistring_AC_DEFUN],
  25   m4_version_prereq([2.64],
  26     [[AC_DEFUN_ONCE(
  27         [$1], [$2])]],
  28     [[AC_DEFUN(
  29         [$1], [$2])]]))
  30 gl_libunistring_AC_DEFUN([gl_LIBUNISTRING],
  31 [
  32   AC_BEFORE([$0], [gl_LIBUNISTRING_MODULE])
  33   AC_BEFORE([$0], [gl_LIBUNISTRING_LIBHEADER])
  34   AC_BEFORE([$0], [gl_LIBUNISTRING_LIB_PREPARE])
  35
  36   m4_ifdef([gl_LIBUNISTRING_OPTIONAL],
  37     [
  38       AC_MSG_CHECKING([whether included libunistring is requested])
  39       AC_ARG_WITH([included-libunistring],
  40         [  --with-included-libunistring  use the libunistring parts included here],
  41         [gl_libunistring_force_included=$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
  49           HAVE_LIBUNISTRING=no
  50         fi
  51         LIBUNISTRING=
  52         LTLIBUNISTRING=
  53       else
  54         gl_LIBUNISTRING_CORE
  55         if test $HAVE_LIBUNISTRING = no; then
  56           gl_libunistring_use_included=yes
  57           LIBUNISTRING=
  58           LTLIBUNISTRING=
  59         fi
  60       fi
  61     ],
  62     [gl_LIBUNISTRING_CORE])
  63 ])
  64
  65 AC_DEFUN([gl_LIBUNISTRING_CORE],
  66 [
  67   AC_REQUIRE([AM_ICONV])
  68   if test -n "$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 $LTLIBICONV"
  88       fi
  89       LIBS="$glus_save_LIBS"
  90     fi
  91   else
  92     AC_LIB_HAVE_LINKFLAGS([unistring], [],
  93       [#include <uniconv.h>], [u8_strconv_from_locale((char*)0);],
  94       [no, consider installing GNU libunistring])
  95   fi
  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
 116            else
 117              dnl Detected version 0.9.2.
 118              gl_libunistring_hexversion=2306
 119            fi
 120          else
 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
 129            else
 130              dnl Detected version 0.9.
 131              gl_libunistring_hexversion=2304
 132            fi
 133          fi
 134        fi
 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"
 140       ])
 141     LIBUNISTRING_VERSION="$gl_cv_libunistring_version"
 142   fi
 143 ])