garbage collection of unused code

Da Zheng zhengda1936@gmail.com
Thu Jun 10 00:06:00 GMT 2010


On 10-6-9 下午3:08, Ian Lance Taylor wrote:
> Da Zheng <zhengda1936@gmail.com> writes:
> 
>> gc-selections in ld can enable garbage collection of unused input sections. I
>> hope some functions can be preserved even though they are not called by other
>> parts of the code. I don't want to change the code. Could I somehow specify in
>> the command line so that some specific functions are excluded from ld's garbage
>> collection?
> 
> The easiest way is to find some set of symbols in the sections you can
> to keep and add a -u option to the linker for each such symbol.  When
> linking using the compiler, as you should, write -Wl,-u,SYMBOL.
> 
> Another way is to use a linker script and use KEEP with the sections
> you want to keep.  I don't recommend this approach unless you can't
> use the first one for some reason.  See the linker manual.
Thanks. The -u option works for me pretty well.

Zheng Da



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