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dnl A placeholder for POSIX 2008 <stddef.h>, for platforms that have issues.

# stddef_h.m4 serial 2

dnl Copyright (C) 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.

AC_DEFUN([gl_STDDEF_H],

[

  AC_REQUIRE([gl_STDDEF_H_DEFAULTS])

  AC_REQUIRE([gt_TYPE_WCHAR_T])

  if test $gt_cv_c_wchar_t = no; then

    HAVE_WCHAR_T=0

    STDDEF_H=stddef.h

  fi

  AC_CACHE_CHECK([whether NULL can be used in arbitrary expressions],

    [gl_cv_decl_null_works],

    [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stddef.h>

      int test[2 * (sizeof NULL == sizeof (void *)) -1];

]])],

      [gl_cv_decl_null_works=yes],

      [gl_cv_decl_null_works=no])])

  if test $gl_cv_decl_null_works = no; then

    REPLACE_NULL=1

    STDDEF_H=stddef.h

  fi

  if test -n "$STDDEF_H"; then

    gl_CHECK_NEXT_HEADERS([stddef.h])

  fi

])

AC_DEFUN([gl_STDDEF_MODULE_INDICATOR],

[

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

  AC_REQUIRE([gl_STDDEF_H_DEFAULTS])

  gl_MODULE_INDICATOR_SET_VARIABLE([$1])

])

AC_DEFUN([gl_STDDEF_H_DEFAULTS],

[

  dnl Assume proper GNU behavior unless another module says otherwise.

  REPLACE_NULL=0;                AC_SUBST([REPLACE_NULL])

  HAVE_WCHAR_T=1;                AC_SUBST([HAVE_WCHAR_T])

  STDDEF_H='';                   AC_SUBST([STDDEF_H])

])