Re: GCC 9 enabled for x86 and arm platforms.

[David Holland <dholland-tech%netbsd.org@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
dholland%netbsd.org@localhost