How can I use the GCC -frandom-seed=<file name> option with the waf build system?

[Joel Sherrill]

On Fri, Sep 23, 2022 at 11:49 AM Sebastian Huber <
sebastian.huber at embedded-brains.de> wrote:

> On 23/09/2022 18:47, Karel Gardas wrote:
> > On 9/23/22 18:35, Sebastian Huber wrote:
> >> Hello,
> >>
> >> I have a question for the waf experts. How can I use the GCC
> >> -frandom-seed=<file name> option with the waf build system?
> >>
> >>
> https://stackoverflow.com/questions/73829827/how-can-i-use-the-gcc-frandom-seed-file-name-option-with-the-waf-build-system
> >
> > Unix? Why not to use pure and simple -frandom-seed=$RANDOM ? E.g. I hope
> > you'd like to have something there hence went for file name which will
> > give you stable "random" value per every file compiled while $RANDOM
> > will give you more randomness and certainly not the same value per same
> > file...
>
> I would like to have a reproducible build, so I don't want something
> which varies across builds.
>

Why not just pass in a constant? You need it to be the same so waf
reacts the same.

And FWIW $RANDOM isn't the best random number source.

--joel

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