gcc iussue or ... ?

[Gianmarco Giovannelli]

At 11/04/2003, Leo Bicknell wrote:
>In a message written on Fri, Apr 11, 2003 at 08:41:37AM +0200, Gianmarco 
>Giovannelli wrote:
> > The problem is that if I compile it under FreeBSD it is a binary of 19M,
> > while on linux (debian 3.0), same Makefile, is only 2MB. FreeBSD 5.0 and
> > OpenBSD 3.1 produce the (about) 19M file.
>
>Well, the problem location is fairly obvious:
>
>% ls -lags | sort -nr | more
>19416 -rwxr-xr-x  1 bicknell  wheel  19854956 Apr 11 09:49 lonewolf*
>16912 -rw-r--r--  1 bicknell  wheel  17286792 Apr 11 09:42 globals.o
>   368 -rw-r--r--  1 bicknell  wheel    365140 Apr 11 09:46 npcinfo.o
>   304 -rw-r--r--  1 bicknell  wheel    301100 Apr 11 09:47 targeting.o
>   272 -rw-r--r--  1 bicknell  wheel    267648 Apr 11 09:48 virtues.o
>[etc]
>
>A quick nm --size-sort globals.o | tail shows:
>
>00009b80 D ownsp
>00009b80 D spawnsp
>000138a0 D location
>00111020 D region
>002180a0 D buffer
>002190a0 D PacketFetcher
>01061710 D PacketSender
>01061778 D cwrap
>010617f0 D w_anim
>01061850 D wp_version
>
>buffer, for instance appears to be 129 * 17000 = 2193000, a 2M
>buffer, and nm shows 2195616 bytes.
>
>I can't track down quickly why the others are so big, but I suspect you
>may be making them bigger than you expected.  It could also be that
>FreeBSD puts some types of globals in the executable to load, where as
>Linux puts them in some zero filled pages or something, I don't know
>enough to know for sure.  Either way, you probably want to make the
>data smaller, or dynamically allocate it to make sure you don't run
>into this on any platform.

The problem is that both the system start from _equals_ conditions (gcc 
version, Makefiles and so on).
I'd like to understand way they generate different (and very different) exe 
file...

Thanks for your kind reply.



Best Regards,
Gianmarco Giovannelli ,  "Unix expert since yesterday"
http://www.gufi.org/~gmarco