On Wed, Jun 05, 2024 at 08:53 PM +1000, "Nicholas Piggin" <npiggin@xxxxxxxxx> wrote:
> On Wed Jun 5, 2024 at 8:42 PM AEST, Marc Hartmayer wrote:
>> On Wed, Jun 05, 2024 at 06:16 PM +1000, Nicholas Piggin <npiggin@xxxxxxxxx> wrote:
>> > Here's another oddity I ran into with the build system. Try run make
>> > twice. With arm64 and ppc64, the first time it removes some intermediate
>> > files and the second causes another rebuild of several files. After
>> > that it's fine. s390x seems to follow a similar pattern but does not
>> > suffer from the problem. Also, the .PRECIOUS directive is not preventing
>> > them from being deleted inthe first place. So... that probably means I
>> > haven't understood it properly and the fix may not be correct, but it
>> > does appear to DTRT... Anybody with some good Makefile knowledge might
>> > have a better idea.
>> >
>>
>> $ make clean -j &>/dev/null && make -d
>> …
>> Successfully remade target file 'all'.
>> Removing intermediate files...
>> rm powerpc/emulator.aux.o powerpc/tm.aux.o powerpc/spapr_hcall.aux.o powerpc/interrupts.aux.o powerpc/selftest.aux.o powerpc/smp.aux.o powerpc/selftest-migration.aux.o powerpc/spapr_vpa.aux.o powerpc/sprs.aux.o powerpc/rtas.aux.o powerpc/memory-verify.aux.o
>>
>> So an easier fix would be to add %.aux.o to .PRECIOUS (but that’s probably still not clean).
>>
>> .PRECIOUS: %.o %.aux.o
>
> Ah, so %.o does not match %.aux.o. That answers that. Did you see
> why s390x is immune? Maybe it defines the target explicitly somewhere.
Not yet :/ But what was also interesting is that if I’m using multiple
jobs I don’t see the issue.
make clean -j; make -j; make -j # <- the last make has nothing to do
if I’m using:
make clean -j; make; make -j # <- the last make has something to do…
that something that irritates me
>
> Is it better to define explicit targets if we want to keep them, or
> add to .PRECIOUS? Your patch would be simpler.
Normally, I would say without .PRECIOUS it’s cleaner, but there is
already a .PRECIOUS for %.so… So as Andrew has already written
.PRECIOUS: %.so %.aux.o
should also be fine.
>
> Thanks,
> Nick
>
--
Kind regards / Beste Grüße
Marc Hartmayer
IBM Deutschland Research & Development GmbH
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