[TriLUG] compiling binaries w/ large file support

[Douglas Kojetin]

Hi All-

This question is a bit out of my realm of knowledge (i'm not a 
programmer; i more or less hack at things until they work -- but mostly 
in scripting languages), but I'm desperate for a workaround.   I have 
the source code (C) to a program that I use on a regular basis.  The 
code was initially written years ago, and while it has been updated on 
a regular basis, one thing apparently lacks that I am having trouble 
with:  large file support.

Specifically, I am working with many input files (in this particular 
case, # = 14723 ... each about 284K).  The output file the program 
creates for this particular conversion is approximately 2.2G.  I get to 
a certain point where the conversion coredumps (and it spits out this 
number: 2147481600).  A search on Google for that number reveals a few 
people have seen this filesize limit (with other programs/processes).  
Apparently the way to resolve this issue is to recode/compile the 
binary for large file support (LFS).  According to a few websites, they 
suggest adding this to CPFLAGS in the Makefile:

-D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE

I did this, but it did not appear to resolve the issue.  I also noticed 
that I could use the program 'strace' to see if the file open's used 
the O_LARGEFILE flag -- which they apparently do not.

I know the most efficient way of getting this resolved might be to have 
the original author of the code do it, but can anyone point me toward 
some references in adding the O_LARGEFILE flag in the file open's?  
(i'm using gcc, by the way).

Thanks,
Doug