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Re: PATCH RFA: Build stages 2 and 3 with C++
On Thu, Jul 21, 2011 at 08:51:46AM -0700, Ian Lance Taylor wrote:
> Basile Starynkevitch <basile@starynkevitch.net> writes:
>
> > I have a similar issue in the MELT branch, and I am passing to -frandom-seed the md5sum
> > of relevant source files. With such a trick, the seed is reproducible from one build to
> > the next one (of the exact same source tree), and does provide much more randomness than
> > just using 0 all the time.
>
> In practice I think it is fine to just pass the source file name to
> -frandom-seed. That's what the patch I sent out does. The source file
> name should be unique within a given program.
Isn't the filename already encoded in what get_file_function_name returns?
It is <filename>_<weak_var_name_crc32>_<random_seed_crc32>, so IMHO
-frandom-seed=$@ brings almost no advantages at all over -frandom-seed=0.
Except perhaps for the characters from the filename that are
wiped into _ by clean_symbol_name.
Jakub