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From: Hongliang Wang <loudwang AT msn DOT com>
To: <cygwin AT cygwin DOT com>
Subject: RE: How does Cygwin support Large files?
Date: Mon, 29 Oct 2007 14:46:43 +0000
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Ok, Thanks!

> Date: Mon, 29 Oct 2007 15:43:09 +0100
> From: corinna-cygwin AT cygwin DOT com
> To: cygwin AT cygwin DOT com
> Subject: Re: How does Cygwin support Large files?
>
> 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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