Re: GCC 9 enabled for x86 and arm platforms.

["Thomas Mueller" <mueller6726%twc.com@localhost>]

> On Sun, Sep 13, 2020 at 07:13:31PM +1000, matthew green wrote:
>  > > Would -r flag in build.sh command be sufficient to ensure a clean build?

>  > > Something like
>  > > ===> build.sh command:    ./build.sh -m amd64 -B nb899-20190723 -M ../obj -T ../tooldir -r -U distribution kernel=SANDY7

>  > this is probably good enough.

>  > -r removes tooldir and destdir.  the lack of -u means
>  > you're doing a cleandir which should mean it rebuilds
>  > everything else.

> That's not always sufficient. Because the clean rules (most of them
> anyway) specifically remove $(OBJS) rather than *.o, and do similar
> things for other build products, after changes stuff can get left
> behind by cleandir. Occasionally it's not harmless stuff.

> Deleting the whole obj tree before a full build doesn't cost very much
> and it's a good precaution with large changes.

> David A. Holland

I guess it's better to play safe and rm -R ../obj/*

I will heed your advice!

Tom