From:	"Jack K." <xos AT o2 DOT pl>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: data alignment
Date:	Thu, 3 May 2001 12:51:51 +0200
Organization:	tp.internet - http://www.tpi.pl
Lines:	33
Message-ID:	<9crm5s$id0$1@news.tpi.pl>
References:	<Pine DOT SUN DOT 3 DOT 91 DOT 1010503110508 DOT 26629L-100000 AT is>
NNTP-Posting-Host:	pe175.gdansk.cvx.ppp.tpnet.pl
X-Trace:	news.tpi.pl 988896252 18848 213.76.28.175 (3 May 2001 13:24:12 GMT)
X-Complaints-To:	usenet AT tpi DOT pl
NNTP-Posting-Date:	3 May 2001 13:24:12 GMT
X-Newsreader:	Microsoft Outlook Express 5.50.4133.2400
X-MSMail-Priority:	Normal
X-Priority:	3
X-MimeOLE:	Produced By Microsoft MimeOLE V5.50.4133.2400
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

Uzytkownik "Eli Zaretskii" <eliz AT is DOT elta DOT co DOT il> napisal w wiadomosci
news:Pine DOT SUN DOT 3 DOT 91 DOT 1010503110508 DOT 26629L-100000 AT is...
>
> On Thu, 3 May 2001, Jack K. wrote:
>
> > The linker (or compiler) ignores if
> > I define a variable with "__attribute__ ((aligned(16)))". What is the
> > reason?
>
> What alignment in bytes did you want for that variable, and how did you
> see that the above attribute is ignored?

Try

// file.c
int aa;
int bb __attribute__ ((aligned(16)));
int main()
{
}

Compile it:
  gcc -c file.c
  ld -Map zz.map file.o

Look over the file zz.map. The "bb" is at address 0x01a04. (aligned 4 not
16)

- Raw text -