[Bug other/69821] -fdebug-prefix-map doesn't affect gcc command line switches in DWARF DW_AT_producer.

[hongxu.jia at windriver dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69821

--- Comment #8 from hongxu jia <hongxu.jia at windriver dot com> ---
(In reply to Jakub Jelinek from comment #7)
> It is not a regression and is user visible change, so I think changing it
> just in GCC 6 is sufficient.

Got it, thanks for pointing it out.
I will backport to our Yocto.

//Hongxu