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From: Alexander Monakov <amonakov@ispras.ru>
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Subject: Re: RTC_RD_TIME
Date: Wed, 30 Aug 2017 19:42:29 +0300 (MSK)
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Thanks, that clears it up. It needs -pedantic and a 64-bit target.

void f(int);
void g()
{
  f(1u<<31|sizeof 0);
}

So casting sizes to 'int' or such in implementation of _IO[RW]* macros
would avoid this particular warning too (but not -Wsign-conversion).

Alexander