[rb-general] Reproducible build of a GCC cross-compiler?

[Richard Purdie]

On Fri, 2019-06-07 at 13:41 +0200, Sebastian Huber wrote:
> Hello,
> 
> has someone tried to do a reproducible build of a GCC cross-compiler? 
> I 
> am not interested in a native GCC. I guess it needs some tweaks in
> the 
> build system of GCC, e.g.
> 
> * use of -frandom-seed=???
> 
> * export SOURCE_DATE_EPOCH=???
> 
> * -ffile-prefix-map=???=???
> 
> * etc.
> 
> It seems there is no magic configuration option in
> 
> https://gcc.gnu.org/install/configure.html
> 
> to enable a reproducible build.

The Yocto Project builds and uses gcc cross compilers and we believe
our builds to be reproducible when configured to be.

We do use SOURCE_DATE_EPOCH and -ffile-prefix-map=.

We're in the final stages of putting together tests which actually test
and prove that in our CI setup, I'm looking forward to being able to
announce those here soon.

Cheers,

Richard