🚀 go-pugleaf

zilla@nj.nec.com (John Lewis) writes:

>Hi, 
>In recompiling a file under gcc 2.2.2 (on sparc2), it seems like gcc
>is handling double alignment in a structure differently 
>than previous versions.  
>The file needs to be linked with some files compiled with the 
>normal sun cc; thus I specified -fpcc-struct-return, which did not help.

>The following self-contained program illustrates the problem.
>The program runs using the sun cc compilation line but fails with a
>buss error when run with either of the gcc lines.  
>================
>/*% cc % -o junk %*                             OK
> *% gcc % -o junk %*                            BUS ERROR
> *% gcc -fpcc-struct-return % -o junk %*        BUS ERROR
> */

>  p += 4;                                     /* make it aligned on 4*/

You mess with the structure alignment requirements. There is
no guarantee that your code will continue to work with Sun's
cc. (And it doesn't, if you use -dalign)
Gcc 2.x assumes that doubles are aligned on 8 byte boundaries.
That assumption holds, until people mess with the alignment.
Actually, I'm suprised that Sun's compiler doesn't do this by default.

Casper
-- 
						|	Casper H.S. Dik
						|	casper@fwi.uva.nl