[Bug driver/70936] Hard-coded C++ header paths and relocation problem on Windows

[lh_mouse at 126 dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70936

--- Comment #2 from lh_mouse <lh_mouse at 126 dot com> ---
(In reply to Andrew Pinski from comment #1)
> I use relocatable directory feature on Linux but I have not tested 6 yet.  
> This is a driver issue I think ...

I was examining gcc/gcc/incpath.c for problems, though failed to find any, I
think it is worthing mentioning that '-iprefix this_directory_need_not_exist/'
effectively vanished the problem - that is, the order of C and C++ include
paths became correct again.