Huge difference in build sizes

[Raghavendra]

Hello Tinti,

Thank you for the reply.

On Tuesday 02 December 2014 05:21 PM, Vinícius Tinti wrote:
> On Tue, Dec 2, 2014 at 7:08 AM, Raghavendra <arrao at cdac.in> wrote:
>> Hello all,
>>
>> I am using Ubuntu-12.04 which came with 3.2 kernel. Parallel to this,
>> I've compiled and installed 3.12.1 kernel using the Ubuntu-3.2's
>> configuration, and the compiler which came with the distro. I've noticed
>> that there is a huge difference in the size of the .ko file between the
>> Ubuntu's kernel and the kernel which I've compiled. Sample results are :
>>
>> $ du -sh usb-storage.ko
>> It shows : 56K for the Ubuntu's 3.2 kernel
>>                   1.3M for the custom kernel that I've compiled
>>
>> I've tested the same thing for a simple hello world module :
>> $ du -sh hello.ko
>> It shows : 4.0k for the Ubuntu's 3.2 kernel
>>                   56k for the custom kernel that I've compiled
>>
>> What could be the reason for this huge amount of difference of storage
>> space in spite of using the same config file and compiler?
> Are you sure that you have build with the same optimization flags?
>
> I guess that "-O2" is missing in the big example. Could you double check?
Actually, I haven't use any optimization flags. I've just hit 'make' 
from the command line while compiling for both the kernels. I even 
checked the Makefile of both the kernels. -O2 flag is used in the same 
way in both the Makefiles.

Regards,
Raghavendra
>
> Regards
>
>> Thanks in advance.
>>
>> Raghavendra
>>
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