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Mail Archives: cygwin/2000/11/12/18:28:03

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Date: Sun, 12 Nov 2000 18:26:08 -0500
Message-Id: <200011122326.SAA15068@envy.delorie.com>
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From: DJ Delorie <dj AT delorie DOT com>
To: dmasters AT rational DOT com
CC: cygwin AT cygwin DOT com
In-reply-to: <C322F78942E6D311AF8800D0B73C4FD8830DD1@CUPEX3.rational.com>
(dmasters AT rational DOT com)
Subject: Re: long double support in cygwin
References: <C322F78942E6D311AF8800D0B73C4FD8830DD1 AT CUPEX3 DOT rational DOT com>

> I link my program with a library that has been GPL'ed -- what do I do?
> 
> * You must make available the source code to the *LIBRARY*.
> * Due to derivation, you must make your program's source available as well.
> 
> I link my program with a library that has been LGPL'ed -- what do I do?
> 
> * You must make available the source code to the *LIBRARY*.
> * You may distribute the source code to your program if you choose.

NO.  This last bullet (note that I swapped them for the purposes of
this email) should read:

* You must distribute either the source code or object files to your
  program, or whatever the user needs to incorporate changes to the
  LGPL'd part into your program.

The LGPL *requires* that the user be able to change the sources for
the LGPL'd part, and rebuild the application (or otherwise cause it to
reflect the changes you made to the source).

In the case of shared libraries under Linux, the "object file" for
your app is the executable; the dynamic linker does the final link
with the libraries at run time.  In the case of Cygwin, the "object
file" is just that - you must give the user whatever they need to be
able to link against libcygwin.dll after rebuilding libcygwin.dll.

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