Re: git: 4dbc7835cdfc - main - mips: Turn off LLVM MIPS targets by default

On Tue, Dec 14, 2021 at 11:57 AM John Baldwin <jhb@freebsd.org> wrote:

> On 12/14/21 10:42 AM, Ed Maste wrote:
> > On Tue, 14 Dec 2021 at 13:27, John Baldwin <jhb@freebsd.org> wrote:
> >>
> >> This breaks NO_CLEAN=yes builds in I think a lot of object files.
> >> ...
> >> Perhaps we should be generating those header files in OBJDIR (and use a
> move-if-changed
> >> scheme to avoid bumping the date if the contents haven't changed) so
> that make can handle
> >> these changes?
> >
> > Seems reasonable if that change is straightforward, but we could also
> > just add a special case in tools/build/depend-cleanup.sh to handle
> > this. depend-cleanup can be fairly liberal, e.g. delete *.def.
>
> Yes, but the problem isn't deleting *.def.  Those are static files whose
> content
> changes based on -D flags passed on the command line and you need to
> delete all
> the *.o files that include those .def files.  Note that if you switch from
> WITHOUT_LLVM_TARGET_ALL to WITH_LLVM_TARGET_ALL or vice versa between
> builds
> you would also hit this issue.
>

True that. Hence my desire to move these into a file that changes when the
option changes :)

If there's some cheap hack I can do to fix this, I'm open to suggestions. I
just don't want to spend
a day futzing with it since I have other things I'm trying to get done this
week....

Warner