[U-Boot] [PATCH v4] Switch from archive libraries to partial linking

Detlev Zundel
2010-11-16T14:58:48Z

Hi,

> On Monday, November 15, 2010 07:13:03 Sebastien Carlier wrote:
>> On 2010-11-15 11:54:07, Wolfgang Denk wrote:
>> > I notice that the patch affects the size of the resulting U-Boot
>> > images.
>> >
>> > For example:
>> >
>> > Configuring for MiniFAP - Board: TQM5200, Options: MINIFAP
>> >
>> > text data bss dec hex filename
>> >
>> > 358144 35208 303248 696600 aa118 ./u-boot before
>> > 361340 35824 303332 700496 ab050 ./u-boot after
>> >
>> > -------------------------------
>> >
>> > Delta: +3896 Bytes
>> >
>> > For other boards it's only a few hundred bytes, but why do we see
>> > such big increase here?
>>
>> In this case, these libraries contribute 3260 bytes in unused
>> definitions:
>>
>> In each case, a whole object file contains exactly the unused
>> definitions, and could be excluded in the respective Makefile.
>
> or just use -ffunction-sections/-fdata-sections/-Wl,--gc-sections and dont
> worry about it. which is what we do for the Blackfin port.

If you do worry, you can use the "--gc-sections" together with
"--print-gc-sections" to actually find out what is unused[1].

Cheers
Detlev

[1] http://article.gmane.org/gmane.comp.boot-loaders.u-boot/84971/

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