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Re: [Bug-gnulib] dirname.h self-contained?
From: |
James Youngman |
Subject: |
Re: [Bug-gnulib] dirname.h self-contained? |
Date: |
26 May 2003 23:31:30 +0100 |
User-agent: |
Gnus/5.09 (Gnus v5.9.0) Emacs/21.3 |
Oskar Liljeblad <address@hidden> writes:
> Also, browsing the other gnulib modules I encountered this:
> Most of the time stddef.h is included unconditionally, but
> sometimes it is included like this (regex.h):
>
> #if !defined _POSIX_C_SOURCE && !defined _POSIX_SOURCE && defined VMS
> /* VMS doesn't have `size_t' in <sys/types.h>, even though POSIX says it
> should be there. */
> # include <stddef.h>
> #endif
There must be a reason why the inclusion of stddef.h isn't done
whenever we determine that it's available, but I don't know what it
is.
> sometimes like this (fnmatch.c):
>
> #if defined STDC_HEADERS || defined _LIBC
> # include <stddef.h>
> # include <stdlib.h>
> #endif
This will certainly work; AC_HEADER_STDC causes STDC_HEADERS to be
#defined if stdlib.h, stdarg.h, string.h and float.h are all
available.
I suppose there might be systems where stddef.h and stdlib.h are
available but don't define size_t, but I' dnot say it's worth worrying
about the possibility overmuch.
> or like this (localcharset.c):
>
> #if HAVE_STDDEF_H
> # include <stddef.h>
> #endif
This is plainly correct.
>
> or (printf-args.h):
>
> #ifdef HAVE_WCHAR_T
> # include <stddef.h>
> #endif
This does, on the face of it, seem a bit odd. However, there is
method to it. What's happening is that the gt_TYPE_WCHAR_T macro in
m4/wchar_t.m4 #includes <stddef.h> in a test program, and determines
if wchar_t is thus available. Hence if this test works, we know that
not only is wchar_t is available, but it lives in <stddef.h>. So that
code snippet looks a bit odd, but it's correct.
--
James Youngman
Manchester, UK.
- [Bug-gnulib] dirname.h self-contained?, Oskar Liljeblad, 2003/05/26
- Re: [Bug-gnulib] dirname.h self-contained?,
James Youngman <=
- Re: [Bug-gnulib] dirname.h self-contained?, Jim Meyering, 2003/05/27
- Re: [Bug-gnulib] dirname.h self-contained?, Bruno Haible, 2003/05/27
- Re: [Bug-gnulib] dirname.h self-contained?, Paul Eggert, 2003/05/27
- Re: [Bug-gnulib] dirname.h self-contained?, Bruno Haible, 2003/05/27
- Re: [Bug-gnulib] dirname.h self-contained?, Jeff Bailey, 2003/05/27
- Re: [Bug-gnulib] dirname.h self-contained?, Paul Eggert, 2003/05/29
- Re: [Bug-gnulib] dirname.h self-contained?, Paul Eggert, 2003/05/29
- Re: [Bug-gnulib] dirname.h self-contained?, Jim Meyering, 2003/05/30
- Re: [Bug-gnulib] dirname.h self-contained?, Bruno Haible, 2003/05/30