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Re: How does Cygwin support Large files?
- From: Corinna Vinschen <corinna-cygwin at cygwin dot com>
- To: cygwin at cygwin dot com
- Date: Mon, 29 Oct 2007 15:43:09 +0100
- Subject: Re: How does Cygwin support Large files?
- References: <BAY106-W31B768234A8E2C3809C049C8910@phx.gbl>
- Reply-to: cygwin at cygwin dot com
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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