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From: Hongliang Wang <loudwang AT msn DOT com>
To: <cygwin AT cygwin DOT com>
Subject: How does Cygwin support Large files?
Date: Mon, 29 Oct 2007 14:32:50 +0000
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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

$ cat test.c

#include 
#include 
#include 
#include 

int main(int argc, char *argv[])
{

                FILE *p= fopen64("test.c", "r");
                int c;

#ifdef _COMPILING_NEWLIB
                printf("newlib\n");
#endif

                p++;
                c= fgetc(p);
                printf("c= %d\n", c);
                return 0;
}

$ 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?

Many many thanks!
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