Please do not top-post.
On Tue, Mar 18, 2008 at 09:54:48PM +0530, Manish Katiyar wrote:
> hmmm.... when I used -Os I got the below error (last few lines)
>
> LD init/built-in.o
> LD .tmp_vmlinux1
> mm/built-in.o: In function `index_of':
> /home/mkatiyar/personal/uml/linux-2.6.23.12/mm/slab.c:341: undefined
> reference to `__bad_size'
> /home/mkatiyar/personal/uml/linux-2.6.23.12/mm/slab.c:341: undefined
> reference to `__bad_size'
> /home/mkatiyar/personal/uml/linux-2.6.23.12/mm/slab.c:341: undefined
> reference to `__bad_size'
> /home/mkatiyar/personal/uml/linux-2.6.23.12/mm/slab.c:341: undefined
> reference to `__bad_size'
> /home/mkatiyar/personal/uml/linux-2.6.23.12/mm/slab.c:341: undefined
> reference to `__bad_size'
> mm/built-in.o:/home/mkatiyar/personal/uml/linux-2.6.23.12/mm/slab.c:341:
> more undefined references to `__bad_size' follow
> collect2: ld returned 1 exit status
> KSYM .tmp_kallsyms1.S
> nm: '.tmp_vmlinux1': No such file
> No valid symbol.
> make: *** [.tmp_kallsyms1.S] Error 1
>
> However using just -O I am able to compile properly . What does "s"
> specify with -O ?
From gcc(1):
-Os Optimize for size. -Os enables all -O2 optimizations that do not
typically increase code size. It also performs further optimiza‐
tions designed to reduce code size.
Erik
--
Erik Mouw -- mouw@xxxxxxxxxxxx
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