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On Tue, Sep 01, 2015 at 15:11:37 +1000, matthew green wrote:

> Masao Uebayashi writes:
> > My recollection is that COPTS used to be a make variable, that is only
> > set by users, but never set by system (in-tree) makefiles.  Now there
> > are not many but some places where COPTS are set by system makefiles.
> > i believe that COPTS+=-fxxx and COPTS+=-DXXX are replaced with
> > CFLAGS+=-fxxx and CPPFLAGS+=-DXXX respectively.
> this doesn't match what my memory says, though it's not *entirely*
> wrong.  COPTS seems to be stuff shared, though it's confusing.
> history on eg, shows that CPUFLAGS is actually what you
> propose COPTS is supposed to be, but sadly, if you look around,
> you'll see that we set CPUFLAGS in our tree a whole lot of places.
> ie, this is a real mismash and some clean up would be great.  what
> you said seems good as a first step.  thanks.

It's an ancient problem.  COPTS usage in kernel makefile is in
conflict its usage in the rest of the tree.  I wrote about it several
times here and on port-sparc, e.g.

port-sparc - b/c lost -O would explode kernel size above OBP limits,
iirc, so it was immediately noticeable.


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