Message-Id: <199810031650.MAA15449@delorie.com>
Comments: Authenticated sender is <mert0407 AT sable DOT ox DOT ac DOT uk>
From: "George Foot" <george DOT foot AT merton DOT ox DOT ac DOT uk>
To: Steve Chapel <schapel AT utilicom DOT com>
Date: Sat, 3 Oct 1998 17:48:04 +0000
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Subject: Re: Linker error [SOLUTION]
Reply-to: mert0407 AT sable DOT ox DOT ac DOT uk
CC: djgpp AT delorie DOT com
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On  3 Oct 98 at 2:31, Steve Chapel wrote:

> After considerable effort, I solved all my problems. Here's how:
...
> 2) Added the line:
>      SET LFN=Y
>    to C:\AUTOEXEC.BAT to enable support for "long file names".
> 
> These suggestions are well buried in the DJGPP FAQ! I can't imagine
> anyone compiling C++ without the long file name support.

While I haven't tried C++ with recent versions, I'm sure it is 
possible (and quite simple) to use it without LFN support -- 
otherwise people on Windows NT and plain DOS systems wouldn't 
be able to use it (since djgpp can't use long filenames yet on 
those systems).

The key thing is to decide at the start whether or not you want 
to use long filenames.  If you do, then use a Windows unzip 
program and "set LFN=y" in your environment.  If you don't, use 
a DOS unzip program (which doesn't understand long filenames) 
and "set LFN=n" in your environment (yes, do it explicitly 
because the default is changing in v2.02).  The DOS unzip 
program will truncate the long filenames to 8.3 format when it 
creates the files, and with LFN disabled djgpp will do the 
same.

The problem occurs when you use a Windows unzip program and 
leave LFN disabled, or use a DOS unzip program with LFN 
enabled.

> 3) Set the DOS Window properties to:
>      Memory | Extended | Auto
>      Memory | DPMI | Auto

It's recommended to set the DPMI memory quota to 65535, which 
is not on the list but is the maximum value that you can type 
into the box.

I don't think these problems are too deeply buried in the FAQ.  
Chapter 8 is entitled "Compile-time and Link-time Problems".  
Within that chapter, section 1 is entitled "GCC can't find 
header files/libraries", and among other things suggests 
increasing the `FILES' quota in config.sys.  Section 2 is 
entitled "GCC can't find C++ headers" and tells you about the 
possible problems related to LFN support.

To demonstrate another (perhaps quicker) way to find this 
information, type `i' (for "index") followed by "header".  It 
immediately pointed me to section 8.2, and pressing `,' (for 
"next entry") took me around several sections solving problems 
related to header files.

-- 
george DOT foot AT merton DOT oxford DOT ac DOT uk