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Date: Mon, 29 Oct 2007 15:43:09 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
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Subject: Re: How does Cygwin support Large files?
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On Oct 29 14:32, Hongliang Wang wrote:
> 
> Hello all, 
> 
> My platform is WindowsXP+SP2, Cygwin DLL release version is 1.5.24-2 
> 
> I am trying to make my program support large files, so in stdio.h I found
> 
> 356 #ifdef __LARGE64_FILES
> 357 #if !defined(__CYGWIN__) || defined(_COMPILING_NEWLIB)
> 
> However, when I tried to compile with _COMPILING_NEWLIB, it fails

Never do that.  It should only be set when compiling newlib itself.

> $ gcc -Wall -D_COMPILING_NEWLIB test.c -o test
> /cygdrive/c/DOCUME~1/wan/LOCALS~1/Temp/ccUmErSH.o:test.c:(.text+0x3a): undefined
>  reference to `_fopen64'
> collect2: ld returned 1 exit status
> 
> It seems as if fopen64 is mapped to _fopen64, while the latter is missing.
> 
> Could anybody tell me how to compile with _COMPILING_NEWLIB flag or how does Cygwin support large files?

Don't compile with _COMPILING_NEWLIB.  64 bit file access is the natural
file access type for Cygwin.  off_t is 8 bytes.  There are no foo64
functions for that reason.  Just use fopen and friends and you get 64
bit file access for free.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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