Re: linker behaviour for sections having flags SHF_MERGE/SHF_STRINGS

[Shankar Kalpathi Easwaran <shankarke at gmail dot com>]

Hi Cary,

The testcase ran fine with -O2. 

Is there any document, that specifies the optimizations done at each level ?

Thanks

Shankar Easwaran


Ian Lance Taylor-3 wrote:
> 
> On Fri, Nov 9, 2012 at 5:40 PM, Cary Coutant <ccoutant@google.com> wrote:
>>>> $gold merge_test.o
>>>> $ readelf -p 2 a.out
>>>>
>>>> String dump of section '.rodata':
>>>>   [     0]  abc
>>>>   [     4]  c
>>>>
>>>> Question :-
>>>> Why is the difference ?
>>>
>>> Possibly a gold bug.
>>
>> Try running gold with the -O2 option. By default, gold won't do the
>> trailing substring optimization.
> 
> And that is because we looked at some very large executables and found
> that it almost never fired, but took something like 5% of total link
> time.  It's available if you want it but on average it doesn't seem
> like a good tradeoff by default.
> 
> Ian
> 
> 

-- 
View this message in context: http://old.nabble.com/linker-behaviour-for-sections-having-flags-SHF_MERGE-SHF_STRINGS-tp34661603p34669662.html
Sent from the Sourceware - binutils list mailing list archive at Nabble.com.