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dnl A placeholder for ISO C99 <wchar.h>, for platforms that have issues.

dnl Copyright (C) 2007, 2009, 2010 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 Written by Eric Blake.

# wchar.m4 serial 4

AC_DEFUN([gl_WCHAR_H],

[

  AC_REQUIRE([gl_WCHAR_H_DEFAULTS])

  AC_CACHE_CHECK([whether <wchar.h> is standalone],

    [gl_cv_header_wchar_h_standalone],

    [AC_COMPILE_IFELSE([[#include <wchar.h>

wchar_t w;]],

      [gl_cv_header_wchar_h_standalone=yes],

      [gl_cv_header_wchar_h_standalone=no])])

  if test $gl_cv_header_wchar_h_standalone != yes; then

    WCHAR_H=wchar.h

  fi

  dnl Prepare for creating substitute <wchar.h>.

  dnl Do it always: WCHAR_H may be empty here but can be set later.

  dnl Check for <wchar.h> (missing in Linux uClibc when built without wide

  dnl character support).

  AC_CHECK_HEADERS_ONCE([wchar.h])

  if test $ac_cv_header_wchar_h = yes; then

    HAVE_WCHAR_H=1

  else

    HAVE_WCHAR_H=0

  fi

  AC_SUBST([HAVE_WCHAR_H])

  gl_CHECK_NEXT_HEADERS([wchar.h])

])

AC_DEFUN([gl_WCHAR_MODULE_INDICATOR],

[

  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.

  AC_REQUIRE([gl_WCHAR_H_DEFAULTS])

  GNULIB_[]m4_translit([$1],[abcdefghijklmnopqrstuvwxyz./-],[ABCDEFGHIJKLMNOPQRSTUVWXYZ___])=1

])

AC_DEFUN([gl_WCHAR_H_DEFAULTS],

[

  GNULIB_WCWIDTH=0; AC_SUBST([GNULIB_WCWIDTH])

  dnl Assume proper GNU behavior unless another module says otherwise.

  HAVE_DECL_WCWIDTH=1; AC_SUBST([HAVE_DECL_WCWIDTH])

  REPLACE_WCWIDTH=0;   AC_SUBST([REPLACE_WCWIDTH])

  WCHAR_H=

  AC_SUBST([WCHAR_H])

])