File: gettext.m4

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# gettext.m4 serial 53 (gettext-0.15)
dnl Copyright (C) 1995-2006 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
dnl
dnl This file can can be used in projects which are not available under
dnl the GNU General Public License or the GNU Library General Public
dnl License but which still want to provide support for the GNU gettext
dnl functionality.
dnl Please note that the actual code of the GNU gettext library is covered
dnl by the GNU Library General Public License, and the rest of the GNU
dnl gettext package package is covered by the GNU General Public License.
dnl They are *not* in the public domain.

dnl Authors:
dnl   Ulrich Drepper <drepper@cygnus.com>, 1995-2000.
dnl   Bruno Haible <haible@clisp.cons.org>, 2000-2005.

dnl Macro to add for using GNU gettext.

dnl Usage: AM_GNU_GETTEXT([INTLSYMBOL], [NEEDSYMBOL], [INTLDIR]).
dnl INTLSYMBOL can be one of 'external', 'no-libtool', 'use-libtool'. The
dnl    default (if it is not specified or empty) is 'no-libtool'.
dnl    INTLSYMBOL should be 'external' for packages with no intl directory,
dnl    and 'no-libtool' or 'use-libtool' for packages with an intl directory.
dnl    If INTLSYMBOL is 'use-libtool', then a libtool library
dnl    $(top_builddir)/intl/libintl.la will be created (shared and/or static,
dnl    depending on --{enable,disable}-{shared,static} and on the presence of
dnl    AM-DISABLE-SHARED). If INTLSYMBOL is 'no-libtool', a static library
dnl    $(top_builddir)/intl/libintl.a will be created.
dnl If NEEDSYMBOL is specified and is 'need-ngettext', then GNU gettext
dnl    implementations (in libc or libintl) without the ngettext() function
dnl    will be ignored.  If NEEDSYMBOL is specified and is
dnl    'need-formatstring-macros', then GNU gettext implementations that don't
dnl    support the ISO C 99 <inttypes.h> formatstring macros will be ignored.
dnl INTLDIR is used to find the intl libraries.  If empty,
dnl    the value `$(top_builddir)/intl/' is used.
dnl
dnl The result of the configuration is one of three cases:
dnl 1) GNU gettext, as included in the intl subdirectory, will be compiled
dnl    and used.
dnl    Catalog format: GNU --> install in $(datadir)
dnl    Catalog extension: .mo after installation, .gmo in source tree
dnl 2) GNU gettext has been found in the system's C library.
dnl    Catalog format: GNU --> install in $(datadir)
dnl    Catalog extension: .mo after installation, .gmo in source tree
dnl 3) No internationalization, always use English msgid.
dnl    Catalog format: none
dnl    Catalog extension: none
dnl If INTLSYMBOL is 'external', only cases 2 and 3 can occur.
dnl The use of .gmo is historical (it was needed to avoid overwriting the
dnl GNU format catalogs when building on a platform with an X/Open gettext),
dnl but we keep it in order not to force irrelevant filename changes on the
dnl maintainers.
dnl
AC_DEFUN([AM_GNU_GETTEXT],
[
  dnl Argument checking.
  ifelse([$1], [], , [ifelse([$1], [external], , [ifelse([$1], [no-libtool], , [ifelse([$1], [use-libtool], ,
    [errprint([ERROR: invalid first argument to AM_GNU_GETTEXT
])])])])])
  ifelse([$2], [], , [ifelse([$2], [need-ngettext], , [ifelse([$2], [need-formatstring-macros], ,
    [errprint([ERROR: invalid second argument to AM_GNU_GETTEXT
])])])])
  define([gt_included_intl], ifelse([$1], [external], [no], [yes]))
  define([gt_libtool_suffix_prefix], ifelse([$1], [use-libtool], [l], []))

  AC_REQUIRE([AM_PO_SUBDIRS])dnl
  ifelse(gt_included_intl, yes, [
    AC_REQUIRE([AM_INTL_SUBDIR])dnl
  ])

  dnl Prerequisites of AC_LIB_LINKFLAGS_BODY.
  AC_REQUIRE([AC_LIB_PREPARE_PREFIX])
  AC_REQUIRE([AC_LIB_RPATH])

  dnl Sometimes libintl requires libiconv, so first search for libiconv.
  dnl Ideally we would do this search only after the
  dnl      if test "$USE_NLS" = "yes"; then
  dnl        if test "$gt_cv_func_gnugettext_libc" != "yes"; then
  dnl tests. But if configure.in invokes AM_ICONV after AM_GNU_GETTEXT
  dnl the configure script would need to contain the same shell code
  dnl again, outside any 'if'. There are two solutions:
  dnl - Invoke AM_ICONV_LINKFLAGS_BODY here, outside any 'if'.
  dnl - Control the expansions in more detail using AC_PROVIDE_IFELSE.
  dnl Since AC_PROVIDE_IFELSE is only in autoconf >= 2.52 and not
  dnl documented, we avoid it.
  ifelse(gt_included_intl, yes, , [
    AC_REQUIRE([AM_ICONV_LINKFLAGS_BODY])
  ])

  dnl Sometimes, on MacOS X, libintl requires linking with CoreFoundation.
  gt_INTL_MACOSX

  dnl Set USE_NLS.
  AC_REQUIRE([AM_NLS])

  ifelse(gt_included_intl, yes, [
    BUILD_INCLUDED_LIBINTL=no
    USE_INCLUDED_LIBINTL=no
  ])
  LIBINTL=
  LTLIBINTL=
  POSUB=

  dnl If we use NLS figure out what method
  if test "$USE_NLS" = "yes"; then
    gt_use_preinstalled_gnugettext=no
    ifelse(gt_included_intl, yes, [
      AC_MSG_CHECKING([whether included gettext is requested])
      AC_ARG_WITH(included-gettext,
        [  --with-included-gettext use the GNU gettext library included here],
        nls_cv_force_use_gnu_gettext=$withval,
        nls_cv_force_use_gnu_gettext=no)
      AC_MSG_RESULT($nls_cv_force_use_gnu_gettext)

      nls_cv_use_gnu_gettext="$nls_cv_force_use_gnu_gettext"
      if test "$nls_cv_force_use_gnu_gettext" != "yes"; then
    ])
        dnl User does not insist on using GNU NLS library.  Figure out what
        dnl to use.  If GNU gettext is available we use this.  Else we have
        dnl to fall back to GNU NLS library.

        dnl Add a version number to the cache macros.
        define([gt_api_version], ifelse([$2], [need-formatstring-macros], 3, ifelse([$2], [need-ngettext], 2, 1)))
        define([gt_cv_func_gnugettext_libc], [gt_cv_func_gnugettext]gt_api_version[_libc])
        define([gt_cv_func_gnugettext_libintl], [gt_cv_func_gnugettext]gt_api_version[_libintl])

        AC_CACHE_CHECK([for GNU gettext in libc], gt_cv_func_gnugettext_libc,
         [AC_TRY_LINK([#include <libintl.h>
]ifelse([$2], [need-formatstring-macros],
[[#ifndef __GNU_GETTEXT_SUPPORTED_REVISION
#define __GNU_GETTEXT_SUPPORTED_REVISION(major) ((major) == 0 ? 0 : -1)
#endif
typedef int array [2 * (__GNU_GETTEXT_SUPPORTED_REVISION(0) >= 1) - 1];
]], [])[extern int _nl_msg_cat_cntr;
extern int *_nl_domain_bindings;],
            [bindtextdomain ("", "");
return * gettext ("")]ifelse([$2], [need-ngettext], [ + * ngettext ("", "", 0)], [])[ + _nl_msg_cat_cntr + *_nl_domain_bindings],
            gt_cv_func_gnugettext_libc=yes,
            gt_cv_func_gnugettext_libc=no)])

        if test "$gt_cv_func_gnugettext_libc" != "yes"; then
          dnl Sometimes libintl requires libiconv, so first search for libiconv.
          ifelse(gt_included_intl, yes, , [
            AM_ICONV_LINK
          ])
          dnl Search for libintl and define LIBINTL, LTLIBINTL and INCINTL
          dnl accordingly. Don't use AC_LIB_LINKFLAGS_BODY([intl],[iconv])
          dnl because that would add "-liconv" to LIBINTL and LTLIBINTL
          dnl even if libiconv doesn't exist.
          AC_LIB_LINKFLAGS_BODY([intl])
          AC_CACHE_CHECK([for GNU gettext in libintl],
            gt_cv_func_gnugettext_libintl,
           [gt_save_CPPFLAGS="$CPPFLAGS"
            CPPFLAGS="$CPPFLAGS $INCINTL"
            gt_save_LIBS="$LIBS"
            LIBS="$LIBS $LIBINTL"
            dnl Now see whether libintl exists and does not depend on libiconv.
            AC_TRY_LINK([#include <libintl.h>
]ifelse([$2], [need-formatstring-macros],
[[#ifndef __GNU_GETTEXT_SUPPORTED_REVISION
#define __GNU_GETTEXT_SUPPORTED_REVISION(major) ((major) == 0 ? 0 : -1)
#endif
typedef int array [2 * (__GNU_GETTEXT_SUPPORTED_REVISION(0) >= 1) - 1];
]], [])[extern int _nl_msg_cat_cntr;
extern
#ifdef __cplusplus
"C"
#endif
const char *_nl_expand_alias (const char *);],
              [bindtextdomain ("", "");
return * gettext ("")]ifelse([$2], [need-ngettext], [ + * ngettext ("", "", 0)], [])[ + _nl_msg_cat_cntr + *_nl_expand_alias ("")],
              gt_cv_func_gnugettext_libintl=yes,
              gt_cv_func_gnugettext_libintl=no)
            dnl Now see whether libintl exists and depends on libiconv.
            if test "$gt_cv_func_gnugettext_libintl" != yes && test -n "$LIBICONV"; then
              LIBS="$LIBS $LIBICONV"
              AC_TRY_LINK([#include <libintl.h>
]ifelse([$2], [need-formatstring-macros],
[[#ifndef __GNU_GETTEXT_SUPPORTED_REVISION
#define __GNU_GETTEXT_SUPPORTED_REVISION(major) ((major) == 0 ? 0 : -1)
#endif
typedef int array [2 * (__GNU_GETTEXT_SUPPORTED_REVISION(0) >= 1) - 1];
]], [])[extern int _nl_msg_cat_cntr;
extern
#ifdef __cplusplus
"C"
#endif
const char *_nl_expand_alias (const char *);],
                [bindtextdomain ("", "");
return * gettext ("")]ifelse([$2], [need-ngettext], [ + * ngettext ("", "", 0)], [])[ + _nl_msg_cat_cntr + *_nl_expand_alias ("")],
               [LIBINTL="$LIBINTL $LIBICONV"
                LTLIBINTL="$LTLIBINTL $LTLIBICONV"
                gt_cv_func_gnugettext_libintl=yes
               ])
            fi
            CPPFLAGS="$gt_save_CPPFLAGS"
            LIBS="$gt_save_LIBS"])
        fi

        dnl If an already present or preinstalled GNU gettext() is found,
        dnl use it.  But if this macro is used in GNU gettext, and GNU
        dnl gettext is already preinstalled in libintl, we update this
        dnl libintl.  (Cf. the install rule in intl/Makefile.in.)
        if test "$gt_cv_func_gnugettext_libc" = "yes" \
           || { test "$gt_cv_func_gnugettext_libintl" = "yes" \
                && test "$PACKAGE" != gettext-runtime \
                && test "$PACKAGE" != gettext-tools; }; then
          gt_use_preinstalled_gnugettext=yes
        else
          dnl Reset the values set by searching for libintl.
          LIBINTL=
          LTLIBINTL=
          INCINTL=
        fi

    ifelse(gt_included_intl, yes, [
        if test "$gt_use_preinstalled_gnugettext" != "yes"; then
          dnl GNU gettext is not found in the C library.
          dnl Fall back on included GNU gettext library.
          nls_cv_use_gnu_gettext=yes
        fi
      fi

      if test "$nls_cv_use_gnu_gettext" = "yes"; then
        dnl Mark actions used to generate GNU NLS library.
        BUILD_INCLUDED_LIBINTL=yes
        USE_INCLUDED_LIBINTL=yes
        LIBINTL="ifelse([$3],[],\${top_builddir}/intl,[$3])/libintl.[]gt_libtool_suffix_prefix[]a $LIBICONV $LIBTHREAD"
        LTLIBINTL="ifelse([$3],[],\${top_builddir}/intl,[$3])/libintl.[]gt_libtool_suffix_prefix[]a $LTLIBICONV $LTLIBTHREAD"
        LIBS=`echo " $LIBS " | sed -e 's/ -lintl / /' -e 's/^ //' -e 's/ $//'`
      fi

      CATOBJEXT=
      if test "$gt_use_preinstalled_gnugettext" = "yes" \
         || test "$nls_cv_use_gnu_gettext" = "yes"; then
        dnl Mark actions to use GNU gettext tools.
        CATOBJEXT=.gmo
      fi
    ])

    if test -n "$INTL_MACOSX_LIBS"; then
      if test "$gt_use_preinstalled_gnugettext" = "yes" \
         || test "$nls_cv_use_gnu_gettext" = "yes"; then
        dnl Some extra flags are needed during linking.
        LIBINTL="$LIBINTL $INTL_MACOSX_LIBS"
        LTLIBINTL="$LTLIBINTL $INTL_MACOSX_LIBS"
      fi
    fi

    if test "$gt_use_preinstalled_gnugettext" = "yes" \
       || test "$nls_cv_use_gnu_gettext" = "yes"; then
      AC_DEFINE(ENABLE_NLS, 1,
        [Define to 1 if translation of program messages to the user's native language
   is requested.])
    else
      USE_NLS=no
    fi
  fi

  AC_MSG_CHECKING([whether to use NLS])
  AC_MSG_RESULT([$USE_NLS])
  if test "$USE_NLS" = "yes"; then
    AC_MSG_CHECKING([where the gettext function comes from])
    if test "$gt_use_preinstalled_gnugettext" = "yes"; then
      if test "$gt_cv_func_gnugettext_libintl" = "yes"; then
        gt_source="external libintl"
      else
        gt_source="libc"
      fi
    else
      gt_source="included intl directory"
    fi
    AC_MSG_RESULT([$gt_source])
  fi

  if test "$USE_NLS" = "yes"; then

    if test "$gt_use_preinstalled_gnugettext" = "yes"; then
      if test "$gt_cv_func_gnugettext_libintl" = "yes"; then
        AC_MSG_CHECKING([how to link with libintl])
        AC_MSG_RESULT([$LIBINTL])
        AC_LIB_APPENDTOVAR([CPPFLAGS], [$INCINTL])
      fi

      dnl For backward compatibility. Some packages may be using this.
      AC_DEFINE(HAVE_GETTEXT, 1,
       [Define if the GNU gettext() function is already present or preinstalled.])
      AC_DEFINE(HAVE_DCGETTEXT, 1,
       [Define if the GNU dcgettext() function is already present or preinstalled.])
    fi

    dnl We need to process the po/ directory.
    POSUB=po
  fi

  ifelse(gt_included_intl, yes, [
    dnl If this is used in GNU gettext we have to set BUILD_INCLUDED_LIBINTL
    dnl to 'yes' because some of the testsuite requires it.
    if test "$PACKAGE" = gettext-runtime || test "$PACKAGE" = gettext-tools; then
      BUILD_INCLUDED_LIBINTL=yes
    fi

    dnl Make all variables we use known to autoconf.
    AC_SUBST(BUILD_INCLUDED_LIBINTL)
    AC_SUBST(USE_INCLUDED_LIBINTL)
    AC_SUBST(CATOBJEXT)

    dnl For backward compatibility. Some configure.ins may be using this.
    nls_cv_header_intl=
    nls_cv_header_libgt=

    dnl For backward compatibility. Some Makefiles may be using this.
    DATADIRNAME=share
    AC_SUBST(DATADIRNAME)

    dnl For backward compatibility. Some Makefiles may be using this.
    INSTOBJEXT=.mo
    AC_SUBST(INSTOBJEXT)

    dnl For backward compatibility. Some Makefiles may be using this.
    GENCAT=gencat
    AC_SUBST(GENCAT)

    dnl For backward compatibility. Some Makefiles may be using this.
    INTLOBJS=
    if test "$USE_INCLUDED_LIBINTL" = yes; then
      INTLOBJS="\$(GETTOBJS)"
    fi
    AC_SUBST(INTLOBJS)

    dnl Enable libtool support if the surrounding package wishes it.
    INTL_LIBTOOL_SUFFIX_PREFIX=gt_libtool_suffix_prefix
    AC_SUBST(INTL_LIBTOOL_SUFFIX_PREFIX)
  ])

  dnl For backward compatibility. Some Makefiles may be using this.
  INTLLIBS="$LIBINTL"
  AC_SUBST(INTLLIBS)

  dnl Make all documented variables known to autoconf.
  AC_SUBST(LIBINTL)
  AC_SUBST(LTLIBINTL)
  AC_SUBST(POSUB)
])


dnl Checks for all prerequisites of the intl subdirectory,
dnl except for INTL_LIBTOOL_SUFFIX_PREFIX (and possibly LIBTOOL), INTLOBJS,
dnl            USE_INCLUDED_LIBINTL, BUILD_INCLUDED_LIBINTL.
AC_DEFUN([AM_INTL_SUBDIR],
[
  AC_REQUIRE([AC_PROG_INSTALL])dnl
  AC_REQUIRE([AM_PROG_MKDIR_P])dnl defined by automake
  AC_REQUIRE([AC_PROG_CC])dnl
  AC_REQUIRE([AC_CANONICAL_HOST])dnl
  AC_REQUIRE([gt_GLIBC2])dnl
  AC_REQUIRE([AC_PROG_RANLIB])dnl
  AC_REQUIRE([gl_VISIBILITY])dnl
  AC_REQUIRE([gt_INTL_SUBDIR_CORE])dnl
  AC_REQUIRE([bh_C_SIGNED])dnl
  AC_REQUIRE([gl_AC_TYPE_LONG_LONG])dnl
  AC_REQUIRE([gt_TYPE_LONGDOUBLE])dnl
  AC_REQUIRE([gt_TYPE_WCHAR_T])dnl
  AC_REQUIRE([gt_TYPE_WINT_T])dnl
  AC_REQUIRE([gl_AC_HEADER_INTTYPES_H])
  AC_REQUIRE([gt_TYPE_INTMAX_T])
  AC_REQUIRE([gt_PRINTF_POSIX])
  AC_REQUIRE([gl_GLIBC21])dnl
  AC_REQUIRE([gl_XSIZE])dnl
  AC_REQUIRE([gt_INTL_MACOSX])dnl

  AC_CHECK_TYPE([ptrdiff_t], ,
    [AC_DEFINE([ptrdiff_t], [long],
       [Define as the type of the result of subtracting two pointers, if the system doesn't define it.])
    ])
  AC_CHECK_HEADERS([stddef.h stdlib.h string.h])
  AC_CHECK_FUNCS([asprintf fwprintf putenv setenv setlocale snprintf wcslen])

  dnl Use the _snprintf function only if it is declared (because on NetBSD it
  dnl is defined as a weak alias of snprintf; we prefer to use the latter).
  gt_CHECK_DECL(_snprintf, [#include <stdio.h>])
  gt_CHECK_DECL(_snwprintf, [#include <stdio.h>])

  dnl Use the *_unlocked functions only if they are declared.
  dnl (because some of them were defined without being declared in Solaris
  dnl 2.5.1 but were removed in Solaris 2.6, whereas we want binaries built
  dnl on Solaris 2.5.1 to run on Solaris 2.6).
  dnl Don't use AC_CHECK_DECLS because it isn't supported in autoconf-2.13.
  gt_CHECK_DECL(getc_unlocked, [#include <stdio.h>])

  case $gt_cv_func_printf_posix in
    *yes) HAVE_POSIX_PRINTF=1 ;;
    *) HAVE_POSIX_PRINTF=0 ;;
  esac
  AC_SUBST([HAVE_POSIX_PRINTF])
  if test "$ac_cv_func_asprintf" = yes; then
    HAVE_ASPRINTF=1
  else
    HAVE_ASPRINTF=0
  fi
  AC_SUBST([HAVE_ASPRINTF])
  if test "$ac_cv_func_snprintf" = yes; then
    HAVE_SNPRINTF=1
  else
    HAVE_SNPRINTF=0
  fi
  AC_SUBST([HAVE_SNPRINTF])
  if test "$ac_cv_func_wprintf" = yes; then
    HAVE_WPRINTF=1
  else
    HAVE_WPRINTF=0
  fi
  AC_SUBST([HAVE_WPRINTF])

  AM_LANGINFO_CODESET
  gt_LC_MESSAGES

  dnl Compilation on mingw and Cygwin needs special Makefile rules, because
  dnl 1. when we install a shared library, we must arrange to export
  dnl    auxiliary pointer variables for every exported variable,
  dnl 2. when we install a shared library and a static library simultaneously,
  dnl    the include file specifies __declspec(dllimport) and therefore we
  dnl    must arrange to define the auxiliary pointer variables for the
  dnl    exported variables _also_ in the static library.
  if test "$enable_shared" = yes; then
    case "$host_os" in
      cygwin*) is_woe32dll=yes ;;
      *) is_woe32dll=no ;;
    esac
  else
    is_woe32dll=no
  fi
  WOE32DLL=$is_woe32dll
  AC_SUBST([WOE32DLL])

  dnl Rename some macros and functions used for locking.
  AH_BOTTOM([
#define __libc_lock_t                   gl_lock_t
#define __libc_lock_define              gl_lock_define
#define __libc_lock_define_initialized  gl_lock_define_initialized
#define __libc_lock_init                gl_lock_init
#define __libc_lock_lock                gl_lock_lock
#define __libc_lock_unlock              gl_lock_unlock
#define __libc_lock_recursive_t                   gl_recursive_lock_t
#define __libc_lock_define_recursive              gl_recursive_lock_define
#define __libc_lock_define_initialized_recursive  gl_recursive_lock_define_initialized
#define __libc_lock_init_recursive                gl_recursive_lock_init
#define __libc_lock_lock_recursive                gl_recursive_lock_lock
#define __libc_lock_unlock_recursive              gl_recursive_lock_unlock
#define glthread_in_use  libintl_thread_in_use
#define glthread_lock_init     libintl_lock_init
#define glthread_lock_lock     libintl_lock_lock
#define glthread_lock_unlock   libintl_lock_unlock
#define glthread_lock_destroy  libintl_lock_destroy
#define glthread_rwlock_init     libintl_rwlock_init
#define glthread_rwlock_rdlock   libintl_rwlock_rdlock
#define glthread_rwlock_wrlock   libintl_rwlock_wrlock
#define glthread_rwlock_unlock   libintl_rwlock_unlock
#define glthread_rwlock_destroy  libintl_rwlock_destroy
#define glthread_recursive_lock_init     libintl_recursive_lock_init
#define glthread_recursive_lock_lock     libintl_recursive_lock_lock
#define glthread_recursive_lock_unlock   libintl_recursive_lock_unlock
#define glthread_recursive_lock_destroy  libintl_recursive_lock_destroy
#define glthread_once                 libintl_once
#define glthread_once_call            libintl_once_call
#define glthread_once_singlethreaded  libintl_once_singlethreaded
])
])


dnl Checks for the core files of the intl subdirectory:
dnl   dcigettext.c
dnl   eval-plural.h
dnl   explodename.c
dnl   finddomain.c
dnl   gettextP.h
dnl   gmo.h
dnl   hash-string.h hash-string.c
dnl   l10nflist.c
dnl   libgnuintl.h.in (except the *printf stuff)
dnl   loadinfo.h
dnl   loadmsgcat.c
dnl   localealias.c
dnl   log.c
dnl   plural-exp.h plural-exp.c
dnl   plural.y
dnl Used by libglocale.
AC_DEFUN([gt_INTL_SUBDIR_CORE],
[
  AC_REQUIRE([AC_C_INLINE])dnl
  AC_REQUIRE([AC_TYPE_SIZE_T])dnl
  AC_REQUIRE([gl_AC_HEADER_STDINT_H])
  AC_REQUIRE([AC_FUNC_ALLOCA])dnl
  AC_REQUIRE([AC_FUNC_MMAP])dnl
  AC_REQUIRE([gt_INTDIV0])dnl
  AC_REQUIRE([gl_AC_TYPE_UINTMAX_T])dnl
  AC_REQUIRE([gl_HEADER_INTTYPES_H])dnl
  AC_REQUIRE([gt_INTTYPES_PRI])dnl
  AC_REQUIRE([gl_LOCK])dnl

  AC_TRY_LINK(
    [int foo (int a) { a = __builtin_expect (a, 10); return a == 10 ? 0 : 1; }],
    [],
    [AC_DEFINE([HAVE_BUILTIN_EXPECT], 1,
       [Define to 1 if the compiler understands __builtin_expect.])])

  AC_CHECK_HEADERS([argz.h limits.h unistd.h sys/param.h])
  AC_CHECK_FUNCS([getcwd getegid geteuid getgid getuid mempcpy munmap \
    stpcpy strcasecmp strdup strtoul tsearch argz_count argz_stringify \
    argz_next __fsetlocking])

  dnl Use the *_unlocked functions only if they are declared.
  dnl (because some of them were defined without being declared in Solaris
  dnl 2.5.1 but were removed in Solaris 2.6, whereas we want binaries built
  dnl on Solaris 2.5.1 to run on Solaris 2.6).
  dnl Don't use AC_CHECK_DECLS because it isn't supported in autoconf-2.13.
  gt_CHECK_DECL(feof_unlocked, [#include <stdio.h>])
  gt_CHECK_DECL(fgets_unlocked, [#include <stdio.h>])

  AM_ICONV

  dnl glibc >= 2.4 has a NL_LOCALE_NAME macro when _GNU_SOURCE is defined,
  dnl and a _NL_LOCALE_NAME macro always.
  AC_CACHE_CHECK([for NL_LOCALE_NAME macro], gt_cv_nl_locale_name,
    [AC_TRY_LINK([#include <langinfo.h>
#include <locale.h>],
      [char* cs = nl_langinfo(_NL_LOCALE_NAME(LC_MESSAGES));],
      gt_cv_nl_locale_name=yes,
      gt_cv_nl_locale_name=no)
    ])
  if test $gt_cv_nl_locale_name = yes; then
    AC_DEFINE(HAVE_NL_LOCALE_NAME, 1,
      [Define if you have <langinfo.h> and it defines the NL_LOCALE_NAME macro if _GNU_SOURCE is defined.])
  fi

  dnl intl/plural.c is generated from intl/plural.y. It requires bison,
  dnl because plural.y uses bison specific features. It requires at least
  dnl bison-1.26 because earlier versions generate a plural.c that doesn't
  dnl compile.
  dnl bison is only needed for the maintainer (who touches plural.y). But in
  dnl order to avoid separate Makefiles or --enable-maintainer-mode, we put
  dnl the rule in general Makefile. Now, some people carelessly touch the
  dnl files or have a broken "make" program, hence the plural.c rule will
  dnl sometimes fire. To avoid an error, defines BISON to ":" if it is not
  dnl present or too old.
  AC_CHECK_PROGS([INTLBISON], [bison])
  if test -z "$INTLBISON"; then
    ac_verc_fail=yes
  else
    dnl Found it, now check the version.
    AC_MSG_CHECKING([version of bison])
changequote(<<,>>)dnl
    ac_prog_version=`$INTLBISON --version 2>&1 | sed -n 's/^.*GNU Bison.* \([0-9]*\.[0-9.]*\).*$/\1/p'`
    case $ac_prog_version in
      '') ac_prog_version="v. ?.??, bad"; ac_verc_fail=yes;;
      1.2[6-9]* | 1.[3-9][0-9]* | [2-9].*)
changequote([,])dnl
         ac_prog_version="$ac_prog_version, ok"; ac_verc_fail=no;;
      *) ac_prog_version="$ac_prog_version, bad"; ac_verc_fail=yes;;
    esac
    AC_MSG_RESULT([$ac_prog_version])
  fi
  if test $ac_verc_fail = yes; then
    INTLBISON=:
  fi
])


dnl Checks for special options needed on MacOS X.
dnl Defines INTL_MACOSX_LIBS.
AC_DEFUN([gt_INTL_MACOSX],
[
  dnl Check for API introduced in MacOS X 10.2.
  AC_CACHE_CHECK([for CFPreferencesCopyAppValue],
    gt_cv_func_CFPreferencesCopyAppValue,
    [gt_save_LIBS="$LIBS"
     LIBS="$LIBS -Wl,-framework -Wl,CoreFoundation"
     AC_TRY_LINK([#include <CoreFoundation/CFPreferences.h>],
       [CFPreferencesCopyAppValue(NULL, NULL)],
       [gt_cv_func_CFPreferencesCopyAppValue=yes],
       [gt_cv_func_CFPreferencesCopyAppValue=no])
     LIBS="$gt_save_LIBS"])
  if test $gt_cv_func_CFPreferencesCopyAppValue = yes; then
    AC_DEFINE([HAVE_CFPREFERENCESCOPYAPPVALUE], 1,
      [Define to 1 if you have the MacOS X function CFPreferencesCopyAppValue in the CoreFoundation framework.])
  fi
  dnl Check for API introduced in MacOS X 10.3.
  AC_CACHE_CHECK([for CFLocaleCopyCurrent], gt_cv_func_CFLocaleCopyCurrent,
    [gt_save_LIBS="$LIBS"
     LIBS="$LIBS -Wl,-framework -Wl,CoreFoundation"
     AC_TRY_LINK([#include <CoreFoundation/CFLocale.h>], [CFLocaleCopyCurrent();],
       [gt_cv_func_CFLocaleCopyCurrent=yes],
       [gt_cv_func_CFLocaleCopyCurrent=no])
     LIBS="$gt_save_LIBS"])
  if test $gt_cv_func_CFLocaleCopyCurrent = yes; then
    AC_DEFINE([HAVE_CFLOCALECOPYCURRENT], 1,
      [Define to 1 if you have the MacOS X function CFLocaleCopyCurrent in the CoreFoundation framework.])
  fi
  INTL_MACOSX_LIBS=
  if test $gt_cv_func_CFPreferencesCopyAppValue = yes || test $gt_cv_func_CFLocaleCopyCurrent = yes; then
    INTL_MACOSX_LIBS="-Wl,-framework -Wl,CoreFoundation"
  fi
  AC_SUBST([INTL_MACOSX_LIBS])
])


dnl gt_CHECK_DECL(FUNC, INCLUDES)
dnl Check whether a function is declared.
AC_DEFUN([gt_CHECK_DECL],
[
  AC_CACHE_CHECK([whether $1 is declared], ac_cv_have_decl_$1,
    [AC_TRY_COMPILE([$2], [
#ifndef $1
  char *p = (char *) $1;
#endif
], ac_cv_have_decl_$1=yes, ac_cv_have_decl_$1=no)])
  if test $ac_cv_have_decl_$1 = yes; then
    gt_value=1
  else
    gt_value=0
  fi
  AC_DEFINE_UNQUOTED([HAVE_DECL_]translit($1, [a-z], [A-Z]), [$gt_value],
    [Define to 1 if you have the declaration of `$1', and to 0 if you don't.])
])


dnl Usage: AM_GNU_GETTEXT_VERSION([gettext-version])
AC_DEFUN([AM_GNU_GETTEXT_VERSION], [])