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[/] [openrisc/] [trunk/] [gnu-stable/] [gdb-7.2/] [gdb/] [gnulib/] [m4/] [stddef_h.m4] - Blame information for rev 816

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Line No. Rev Author Line
1 330 jeremybenn
dnl A placeholder for POSIX 2008 <stddef.h>, for platforms that have issues.
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# stddef_h.m4 serial 2
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dnl Copyright (C) 2009, 2010 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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  gl_MODULE_INDICATOR_SET_VARIABLE([$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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])

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