dougp:
Am I correct in assuming that his license is to be included in any distribution?
Are you distributing his source code with yours? Or linking to his?
(GNU GPL Version 3 is an odd {poisonous} choice for a library.)
dougp:
Also included are avr/sleep.h, avr/io.h, and EEPROM.h. Do these require license notices as well?
Huh. I see the Arduino folks have stripped the license file from the AVR-GCC distribution. That was a no-no.
What I remember is that Libc is licensed separately from the compiler. Let's check...
Yes. This is the license of interest...
https://www.microchip.com/webdoc/AVRLibcReferenceManual/index_1license.html
So, the answer is "yes". You will need to include the license with any Libc files.
Huh. It looks like the license within sleep.h deviates from Microchip's overall license...
/* Copyright (c) 2002, 2004 Theodore A. Roth
Copyright (c) 2004, 2007, 2008 Eric B. Weddington
Copyright (c) 2005, 2006, 2007 Joerg Wunsch
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
-
Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
-
Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
-
Neither the name of the copyright holders nor the names of
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE. */
dougp:
What sort of license/permission do I include...
Other than no liability, what do you want? Attribution? No commercial use? Share-a-like?