From: Philip Oakley <philipoakley@iee.org>
Date: Wed, 04 May 2016 22:59:23 GMT
Subject: unary minus operator applied to unsigned type, result still unsigned?
Message-ID: <74B59A4DF45C45AF9CDCF6662DDAEF1E@PhilipOakley>

I'm working on building Git on Visual Studio as part of the Git for Windows
capability.

The MSVC compiler is reporting:

1>..\sha1-lookup.c(100) : warning C4146: unary minus operator applied to
unsigned type, result still unsigned

1>..\sha1-lookup.c(316) : warning C4146: unary minus operator applied to
unsigned type, result still unsigned

the two lines of code are the same, and the message suggests a bad return 
value:

#100: return -lo-1;

#316: return -lo-1;


Should these be protected by an appropriate brackets/calculation (-1-lo) ? 
Or does
gcc use an alternate assumption about unary minus conversion for functions
returning int?

--

Philip