Re: Automatic dependencies are out of sync

[Andrew Cooper <andrew.cooper3@citrix.com>]

On 06/09/18 09:27, Juergen Gross wrote:
> On 06/09/18 10:10, Jan Beulich wrote:
>
>>> %: %.o
>>>         gcc $< -o $@
>>>
>>> -include $(DEPS)
>>>
>>> -->8 snip here 8<--
>>>
>>> So the basic ideas are:
>>>
>>> - add a rule for constructing the .d files
>>> - let the build depend on the .d2 files
>> IOW I wonder whether this really is any different from what we
>> do now (minus bugs/quirks in make itself, of course). And from this
>> as well as your original mail I still don't understand what's actually
>> broken with the current approach.
> The main problem is that the .d2 files used for determining which object
> files need to be (re-)built are based on the build before the last one.
> I'm not sure this is always the case, but at least when starting with a
> clean tree I need two invocations of "make" to get all .d2 files built.

As an alternative, can we see about fixing the real bug and getting rid
of .d2 all together?

I still revert that change for some of my builds, because it completely
breaks the incremental build (by causing most things to be rebuilt).

Whatever the underlying issue is, fixing it by sed'ing the dependency
files is gross hack, rather than a fix.

~Andrew

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