Re: [Qemu-devel] [PATCH v2] Drop --whole-archive and static libraries

[Blue Swirl <blauwirbel@gmail.com>]

On Wed, Jan 6, 2010 at 6:51 PM, Andreas Färber <andreas.faerber@web.de> wrote:
>
> Am 04.01.2010 um 21:47 schrieb Blue Swirl:
>
>> On Sun, Jan 3, 2010 at 12:31 PM, Blue Swirl <blauwirbel@gmail.com> wrote:
>>>
>>> 2009/12/31 Andreas Färber <andreas.faerber@web.de>:
>>>>
>>>> From: Andreas Färber <afaerber@opensolaris.org>
>>>>
>>>> Juan has contributed a cool Makefile infrastructure that enables us to
>>>> drop
>>>> static libraries completely:
>>>>
>>>> Move shared obj-y definitions to Makefile.objs, prefixed
>>>> {common-,hw-,user-},
>>>> and link those object files directly into the executables.
>>>>
>>>> Replace HWLIB by HWDIR, specifying only the directory.
>>>>
>>>> Drop --whole-archive and ARLIBS in Makefiles and configure.
>>>>
>>>> Drop GENERATED_HEADERS dependency in rules.mak, since this rebuilds all
>>>> common objects after generating a target-specific header; add dependency
>>>> rules to Makefile and Makefile.target instead.
>>>>
>>>> v2:
>>>> - Don't try to include /config.mak for user emulators
>>>> - Changes to user object paths ("Quickfix for libuser.a drop") were
>>>> obsoleted
>>>>  by "user_only: compile everything with -fpie" (Kirill A. Shutemov)
>>>
>>> Breaks build:
>>>  CC    i386-softmmu/i386-dis.o
>>> make[1]: *** No rule to make target `/loader.o', needed by `qemu'.  Stop.
>>
>> I found out that completely removing the object directory and
>> recreating it from scratch helps. This sucks bisectability-wise, is
>> there any way to avoid it?
>
> Sounds as if configure was not re-run and thus $(HWDIR) not set in
> config-target.mak. No idea why, more likely a general issue.
> Do you have a way to reproduce? What about `make clean` or `make distclean`?

Strange, now that I try to reproduce it with a new directory,
everything works. Also my normal compile directory does not show the
problem anymore. Maybe there were some old files lying around.

>> There is still one problem, tools need config-host.h but the
>> dependencies are not correct:
>>  CC    qemu-nbd.o
>> In file included from /src/qemu/qemu-nbd.c:19:
>> /src/qemu/qemu-common.h:32:25: error: config-host.h: No such file or
>> directory
>
> Fix coming up. Basically, $(GENERATED_HEADERS) were previously used on _all_
> object files via rules.mak. That does not work when referencing objects from
> another Makefile, so the modelling needs to be done explicitly.

OK. Since there have been no objections, I'd like to apply this soon.