linker behaviour for sections having flags SHF_MERGE/SHF_STRINGS
Ian Lance Taylor
Sat Nov 10 02:26:00 GMT 2012
On Fri, Nov 9, 2012 at 5:40 PM, Cary Coutant <firstname.lastname@example.org> 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.
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