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doc malloc zero

From: Kevin Ryde
Subject: doc malloc zero
Date: Mon, 17 May 2004 08:13:05 +1000
User-agent: Gnus/5.110002 (No Gnus v0.2) Emacs/21.3 (gnu/linux)

        * doc/autoconf-new.texi (Function Portability): Add note on malloc(0),
        cross referencing AC_FUNC_MALLOC.

     The ISO C99 standard says a call `malloc(0)' is implementation
     dependent, it may either return `NULL' (eg. OSF 4) or non-`NULL'
     (eg. GNU C Library).  `AC_FUNC_MALLOC' can be used to insist on
     non-`NULL' (*note Particular Functions::).

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