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
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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)