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From: | Bruno Haible |
Subject: | bug#7928: mktime test in configure: UB resulting in infinite loop |
Date: | Fri, 28 Jan 2011 18:57:22 +0100 |
User-agent: | KMail/1.9.9 |
Rich Felker wrote: > Testing which of the three allowable signed integer > representations is used is easy: compare ~(t)1 against and -(t)1 and > -(t)2. Testing which of the three signed integer representations is in use is not even needed: Your formula ((((t) 1 << (sizeof (t) * CHAR_BIT - 2)) - 1) * 2 + 1) yields the correct result in all three cases. Bruno
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