[busybox] some size savings

[Bernhard Fischer]

On Thu, Nov 03, 2005 at 09:33:40AM -0500, Paul Fox wrote:
> > On Wednesday 02 November 2005 14:48, Bernhard Fischer wrote:
> > > Stressing compilers like that did (for me, at least) trigger some more
> > > or less "interresting" compiler deficiencies, AFAIC): Pathscale as well
> > > as gcc gave up on multiple fn() names per unit (illegal code, granted,
> > > still -- unwarned thus uncought), icc -- and the rest of the gang i
> > > tried this approach with -- segfault{ed,s} on certain other corner
> > > cases and the like. Minor noise in compiler-evolution, from my POV,
> > > fwiw. Nothing fancy, just a couple of bugs at our side and a handful
> > > dozend of 'em at "producers" side of affairs..
> > 
> > It's ok for 1.1 to require a new compiler, but we'll need to have it in by 
> > -pre2.
>
>say what?  i guess i've been sleeping.  exactly what's going to break,
>using existing 3.3 compilers that work on busybox 1.0?

the patch won't break gcc-3.x and gcc-4.x. I couldn't compile current
svn with a gcc-2.95 (it fails in cut.c).

>
> > Is this still the libbb.so work we're discussing?  (You're trying to build 
> > libbb.so all in one gulp?)  The relevant question is probably "any idea what 
> > kind of memory footprint it takes to compile this puppy"?  (Keeping in mind 
> > that you can't build gcc 4.0.2 in a measly 128 megs of ram without swap.  256 
> > it builds in, though.  Right now I believe we compile in 32...)
> > 
> > And what kind of space savings are you seeing?
>
>my question too.

http://members.aon.at/berny_f/busybox/busybox.combine-20051106-2306.tar.bz2
is the patch + allyesconfig with e2fsprogs disabled.

with this config, i get (oorig == svn r12083, c == r12083+patch):

780 -rwxr-xr-x  1 1000 1000 791704 2005-11-06 23:13 busybox.c.gcc-3.3
776 -rwxr-xr-x  1 1000 1000 788760 2005-11-06 20:57 ../oorig/busybox.gcc-3.3
740 -rwxr-xr-x  1 1000 1000 750708 2005-11-06 23:12 busybox.c.gcc-3.4
736 -rwxr-xr-x  1 1000 1000 747860 2005-11-06 20:55 ../oorig/busybox.gcc-3.4
744 -rwxr-xr-x  1 1000 1000 755588 2005-11-06 23:11 busybox.c.gcc-4.0
748 -rwxr-xr-x  1 1000 1000 758548 2005-11-06 20:54 ../oorig/busybox.gcc-4.0
716 -rwxr-xr-x  1 1000 1000 728216 2005-11-06 23:09 busybox.c.gcc-4.1
736 -rwxr-xr-x  1 1000 1000 745808 2005-11-06 20:53 ../oorig/busybox.gcc-4.1

   text	   data	    bss	    dec	    hex	filename
 775337	  11816	1046692	1833845	 1bfb75	../oorig/busybox.gcc-3.3
 775945	  12200	1047556	1835701	 1c02b5	busybox.c.gcc-3.3
   text	   data	    bss	    dec	    hex	filename
 734462	  11792	1046596	1792850	 1b5b52	../oorig/busybox.gcc-3.4
 734214	  12176	1047492	1793882	 1b5f5a	busybox.c.gcc-3.4
   text	   data	    bss	    dec	    hex	filename
 744028	  11820	1046724	1802572	 1b814c	../oorig/busybox.gcc-4.0
 741985	  12008	1047224	1801217	 1b7c01	busybox.c.gcc-4.0
   text	   data	    bss	    dec	    hex	filename
 733284	  10920	1046468	1790672	 1b52d0	../oorig/busybox.gcc-4.1
 717859	   8764	1045932	1772555	 1b0c0b	busybox.c.gcc-4.1