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Re: FYI: [PATCH] utimecmp: avoid new GCC 7 warning from -Wbool-operation


From: Paul Eggert
Subject: Re: FYI: [PATCH] utimecmp: avoid new GCC 7 warning from -Wbool-operation
Date: Wed, 5 Oct 2016 12:39:18 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.3.0

On 10/05/2016 10:47 AM, Jim Meyering wrote:
we can do
the #pragma push/disable-warning/pop dance around that code, but
that seems like overkill.

Agreed, it's overkill. Also, I was tempted to suggest -1-x instead of ~(x?1:0) but that assumes two's complement. So let's just leave it alone. At least GCC is smart enough to optimize it as if it were ~x.

I filed a GCC bug report here:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77876

I hope they fix it one way or another.




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