Re: Initialization Of Static Pointer Variables

From	David Brown <david.brown@hesbynett.no>
Newsgroups	comp.lang.c
Subject	Re: Initialization Of Static Pointer Variables
Date	2026-08-22 13:12 +0200
Organization	A noiseless patient Spider
Message-ID	<116c07d$1274o$1@dont-email.me> (permalink)
References	<11681np$3s8jk$4@dont-email.me> <11683d0$jki7$1@artemis.inf.ed.ac.uk> <116a7vj$iojj$1@dont-email.me>

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On 21/08/2026 21:12, Chris M. Thomasson wrote:
> On 8/20/2026 4:42 PM, Richard Tobin wrote:
>> In article <11681np$3s8jk$4@dont-email.me>,
>> Lawrence D;Oliveiro  <ldo@nz.invalid> wrote:
>>
>>> The spec also says that all static variables are initialized to zero
>>> at program start time. Are pointer variables allowed to be given an
>>> all-zero bit pattern at this time? Or are they supposed to be
>>> initialized to the NULL value (if that's different) instead?
>>
>> ISO C 1999, 6.7.8:
>>
>> If an object that has automatic storage duration is not initialized
>> explicitly, its value is indeterminate. If an object that has static
>> storage duration is not initialized explicitly, then:
>>
>> — if it has pointer type, it is initialized to a null pointer;
> 
> Oh. I must have missed that one.
> 
> so:
> 
> static void* g_ptr;
> 
> 
> is guaranteed to be nullptr? Just to clarify...
> 
Yes.

Thread

Initialization Of Static Pointer Variables Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-08-20 23:14 +0000
  Re: Initialization Of Static Pointer Variables "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-08-20 16:28 -0700
    Re: Initialization Of Static Pointer Variables "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-08-20 16:29 -0700
  Re: Initialization Of Static Pointer Variables richard@cogsci.ed.ac.uk (Richard Tobin) - 2026-08-20 23:42 +0000
    Re: Initialization Of Static Pointer Variables "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-08-21 12:12 -0700
      Re: Initialization Of Static Pointer Variables David Brown <david.brown@hesbynett.no> - 2026-08-22 13:12 +0200
        Re: Initialization Of Static Pointer Variables steve g <Sgonedes1977@gmail.com> - 2026-08-23 16:01 -0400
          Re: Initialization Of Static Pointer Variables Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-08-23 22:16 +0000
          Re: Initialization Of Static Pointer Variables Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-08-23 15:29 -0700
            Re: Initialization Of Static Pointer Variables David Brown <david.brown@hesbynett.no> - 2026-08-24 10:16 +0200
              Re: Initialization Of Static Pointer Variables Richard Harnden <richard.nospam@gmail.invalid> - 2026-08-24 09:45 +0100
                Re: Initialization Of Static Pointer Variables Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-08-24 03:04 -0700
                Re: Initialization Of Static Pointer Variables David Brown <david.brown@hesbynett.no> - 2026-08-24 12:40 +0200
                Re: Initialization Of Static Pointer Variables Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-08-24 13:16 -0700
                Re: Initialization Of Static Pointer Variables David Brown <david.brown@hesbynett.no> - 2026-08-25 08:51 +0200
                Re: Initialization Of Static Pointer Variables Richard Harnden <richard.nospam@gmail.invalid> - 2026-08-25 12:20 +0100
                Re: Initialization Of Static Pointer Variables David Brown <david.brown@hesbynett.no> - 2026-08-25 14:15 +0200
                Re: Initialization Of Static Pointer Variables Richard Harnden <richard.nospam@gmail.invalid> - 2026-08-25 15:11 +0100
                Re: Initialization Of Static Pointer Variables David Brown <david.brown@hesbynett.no> - 2026-08-25 16:35 +0200
                Re: Initialization Of Static Pointer Variables richard@cogsci.ed.ac.uk (Richard Tobin) - 2026-08-25 16:19 +0000
                Re: Initialization Of Static Pointer Variables David Brown <david.brown@hesbynett.no> - 2026-08-25 20:07 +0200
                Re: Initialization Of Static Pointer Variables Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-08-25 21:49 +0000
                Re: Initialization Of Static Pointer Variables Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-08-25 21:47 +0000
          Re: Initialization Of Static Pointer Variables richard@cogsci.ed.ac.uk (Richard Tobin) - 2026-08-23 22:28 +0000
          Cryptographic zero initialization (was: Re: Initialization Of Static Pointer Variables) Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-08-24 19:26 +0800
  Re: Initialization Of Static Pointer Variables Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-08-20 16:52 -0700
  Re: Initialization Of Static Pointer Variables James Kuyper <jameskuyper@alumni.caltech.edu> - 2026-08-20 20:12 -0400
  Re: Initialization Of Static Pointer Variables bart <bc@freeuk.com> - 2026-08-21 01:16 +0100
    Re: Initialization Of Static Pointer Variables Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-08-20 17:53 -0700
    Re: Initialization Of Static Pointer Variables James Kuyper <jameskuyper@alumni.caltech.edu> - 2026-08-20 23:01 -0400
      Re: Initialization Of Static Pointer Variables Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-08-21 08:02 +0000
        Re: Initialization Of Static Pointer Variables scott@slp53.sl.home (Scott Lurndal) - 2026-08-21 14:53 +0000
          Re: Initialization Of Static Pointer Variables richard@cogsci.ed.ac.uk (Richard Tobin) - 2026-08-21 15:28 +0000
    Re: Initialization Of Static Pointer Variables David Brown <david.brown@hesbynett.no> - 2026-08-21 09:12 +0200
  Re: Initialization Of Static Pointer Variables David Brown <david.brown@hesbynett.no> - 2026-08-21 09:03 +0200
    Re: Initialization Of Static Pointer Variables Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-08-21 17:54 +0800
  Re: Initialization Of Static Pointer Variables Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-08-21 17:50 +0800
  Re: Initialization Of Static Pointer Variables Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-08-21 06:02 -0700

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