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Re: PATCH : free(NULL) in cpphash.c

To: zack at wolery dot cumb dot org
Subject: Re: PATCH : free(NULL) in cpphash.c
From: Mark Mitchell <mark at codesourcery dot com>
Date: Tue, 04 Apr 2000 22:20:00 -0700
Cc: phdm at macqel dot be, gcc-patches at gcc dot gnu dot org
Organization: CodeSourcery, LLC
References: <200004050449.GAA18235@mail.macqel.be><20000404215420.P2775@wolery.cumb.org>

>>>>> "Zack" == Zack Weinberg <zack@wolery.cumb.org> writes:

    Zack> free(NULL) is defined to be a no-op

I don't think that's true in ISO C.  In C++, `delete NULL' is defined
to be a no-op, but in ISO C, I believe that `free (NULL)' has
undefined behavior.  I have certainly programmed systems that would
crash when you tried this. :-(

--
Mark Mitchell                   mark@codesourcery.com
CodeSourcery, LLC               http://www.codesourcery.com

Follow-Ups:
- Re: PATCH : free(NULL) in cpphash.c
  - From: Zack Weinberg

References:
- PATCH : free(NULL) in cpphash.c
  - From: Philippe De Muyter
- Re: PATCH : free(NULL) in cpphash.c
  - From: Zack Weinberg

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