Date: Mon, 15 Mar 2004 16:01:45 +0900 From: Alexander Nedotsukov <bland@FreeBSD.org> To: alpha@FreeBSD.org Subject: Is the way static data alligned correct? Message-ID: <405554D9.4000208@FreeBSD.org>
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Guys,
Recently doing some development I hit alignment problem on alpha
machines. Problem solved but the way I did it in fact the reason why I
asking pros to judge who is wrong here.
Inside code I have linked-in data blocks generated by external tool.
They looks like this:
const unsigned char raw_data_block[] = { bla-bla-bla };
Internal block content is 8 bytes aligned. Each block resides in a
single .c file. So after compilation I have a set of .o files linked
later into single shared object (library). Taking an address of such
data block and casting it to pointer to some real structure was a
problem because it is not necesary 8 byte aligned. Obvious solution was
to ask explicitly for such alignment:
const unsigned char raw_data_block[] __attribute__ ((alligned(8))) =
{ bla-bla-bla };
But I wonder is this gcc bug or space optimization for char arrays only?
Thanks,
Alexander.
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