Re: [PATCH 1/9] Define a structure for object IDs.

From: Andreas Schwab <schwab@linux-m68k.org>
Date: May 4, 2014, 10:55 UTC
Message-ID: <m2mwexke34.fsf@linux-m68k.org>
In-Reply-To: <536606AB.1020803@kdbg.org>

Johannes Sixt <j6t@kdbg.org> writes:

> I think that a compiler that has different size and alignment requirements
> for the proposed struct object_id and an unsigned char[20] would, strictly
> speaking, not be a "C" compiler.

Unlike arrays, a struct can have arbitrary internal padding. It is perfectly compliant (and even reasonable) to make struct object_id require 8 byte alignment, adding 4 bytes of padding at the end.

Andreas.

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Andreas Schwab, schwab@linux-m68k.org
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