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Viewing changes to gnulib/m4/stddef_h.m4

  • Committer: Bazaar Package Importer
  • Author(s): Samuel Thibault
  • Date: 2010-01-12 23:48:47 UTC
  • mto: (1.1.4 upstream) (5.2.1 experimental)
  • mto: This revision was merged to the branch mainline in revision 8.
  • Revision ID: james.westby@ubuntu.com-20100112234847-ph9xdk3lrjdox6ks
Import upstream version 1.8.0

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gnulib/m4/stddef_h.m4
 
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dnl A placeholder for POSIX 2008 <stddef.h>, for platforms that have issues.
 
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# stddef_h.m4 serial 1
 
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dnl Copyright (C) 2009 Free Software Foundation, Inc.
 
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dnl This file is free software; the Free Software Foundation
 
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dnl gives unlimited permission to copy and/or distribute it,
 
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dnl with or without modifications, as long as this notice is preserved.
 
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AC_DEFUN([gl_STDDEF_H],
 
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[
 
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  AC_REQUIRE([gl_STDDEF_H_DEFAULTS])
 
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  AC_REQUIRE([gt_TYPE_WCHAR_T])
 
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  if test $gt_cv_c_wchar_t = no; then
 
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    HAVE_WCHAR_T=0
 
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    STDDEF_H=stddef.h
 
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  fi
 
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  AC_CACHE_CHECK([whether NULL can be used in arbitrary expressions],
 
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    [gl_cv_decl_null_works],
 
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    [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stddef.h>
 
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      int test[2 * (sizeof NULL == sizeof (void *)) -1];
 
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]])],
 
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      [gl_cv_decl_null_works=yes],
 
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      [gl_cv_decl_null_works=no])])
 
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  if test $gl_cv_decl_null_works = no; then
 
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    REPLACE_NULL=1
 
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    STDDEF_H=stddef.h
 
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  fi
 
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  if test -n "$STDDEF_H"; then
 
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    gl_CHECK_NEXT_HEADERS([stddef.h])
 
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  fi
 
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])
 
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AC_DEFUN([gl_STDDEF_MODULE_INDICATOR],
 
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[
 
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  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
 
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  AC_REQUIRE([gl_STDDEF_H_DEFAULTS])
 
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  GNULIB_[]m4_translit([$1],[abcdefghijklmnopqrstuvwxyz./-],[ABCDEFGHIJKLMNOPQRSTUVWXYZ___])=1
 
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])
 
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AC_DEFUN([gl_STDDEF_H_DEFAULTS],
 
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[
 
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  dnl Assume proper GNU behavior unless another module says otherwise.
 
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  REPLACE_NULL=0;                AC_SUBST([REPLACE_NULL])
 
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  HAVE_WCHAR_T=1;                AC_SUBST([HAVE_WCHAR_T])
 
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  STDDEF_H='';                   AC_SUBST([STDDEF_H])
 
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])