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doc AC_FUNC_CLOSEDIR_VOID cross compiling

From: Kevin Ryde
Subject: doc AC_FUNC_CLOSEDIR_VOID cross compiling
Date: Sun, 28 Mar 2004 06:59:38 +1000
User-agent: Gnus/5.110002 (No Gnus v0.2) Emacs/21.3 (gnu/linux) 
        * doc/autoconf.texi (Particular Functions): For AC_FUNC_CLOSEDIR_VOID,
        note pessimistic assumption when cross compiling.

New second paragraph:

 - Macro: AC_FUNC_CLOSEDIR_VOID
     If the `closedir' function does not return a meaningful value,
     define `CLOSEDIR_VOID'.  Otherwise, callers ought to check its
     return value for an error indicator.

     Currently this test is implemented by running a test program.  When
     cross compiling, the pessimistic assumption that `closedir' does
     not return a meaningful value is made.
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