Re: [Xen-devel] Hypervisor build can't work without `python` (Was: Re: Xen commit 9b0bc91b3 possibly removed too much info from README)

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Wed, Apr 17, 2019 at 11:58:49AM +0100, Andrew Cooper wrote:
> On 17/04/2019 11:57, Wei Liu wrote:
> > On Wed, Apr 17, 2019 at 11:44:36AM +0100, Andrew Cooper wrote:
> >> On 17/04/2019 11:41, Wei Liu wrote:
> >>> On Wed, Apr 17, 2019 at 10:56:57AM +0100, Wei Liu wrote:
> >>>>> Here's what i did having pulled the master at commit cb70a26
> >>>>>
> >>>>> tar xf /path/to/xen-cb70a26.tar.gz
> >>>>>
> >>>>> cd xen-master/
> >>>>>
> >>>>> PYTHON=/usr/bin/python3 ./configure --prefix=/usr   \
> >>>>>    --disable-seabios   \
> >>>>>    --disable-qemu-traditional  \
> >>>>>    --disable-rombios     \
> >>>>>    --disable-stubdom 2>&1 | tee ../config.log
> >>>>>
> >>>>> make EFI_DIR=/usr/lib/efi world 2>&1 | tee ../make_world_3.out
> >>>>>
> >>>>>
> >>>>> ...
> >>>>> gcc -Wp,-MD,tools/kconfig/.zconf.tab.o.d    -D_GNU_SOURCE
> >>>>> -D_DEFAULT_SOURCE -DCURSES_LOC="<ncurses.h>" -DNCURSES_WIDECHAR=1
> >>>>> -DLOCALE  -Itools/kconfig -c -o tools/kconfig/zconf.tab.o
> >>>>> tools/kconfig/zconf.tab.c
> >>>>> gcc  -o tools/kconfig/conf tools/kconfig/conf.o 
> >>>>> tools/kconfig/zconf.tab.o
> >>>>> tools/kconfig/conf -s --silentoldconfig Kconfig
> >>>>> make[3]: Leaving directory '/usr/src/xen/xen-master/xen'
> >>>>> make -f Rules.mk _install
> >>>>> make[3]: Entering directory '/usr/src/xen/xen-master/xen'
> >>>>> make -C tools
> >>>>> make[4]: Entering directory '/usr/src/xen/xen-master/xen/tools'
> >>>>> make symbols
> >>>>> make[5]: Entering directory '/usr/src/xen/xen-master/xen/tools'
> >>>>> gcc -Wall -Werror -Wstrict-prototypes -O2 -fomit-frame-pointer
> >>>>> -fno-strict-aliasing -Wdeclaration-after-statement -o symbols
> >>>>> symbols.c
> >>>>> make[5]: Leaving directory '/usr/src/xen/xen-master/xen/tools'
> >>>>> make[4]: Leaving directory '/usr/src/xen/xen-master/xen/tools'
> >>>>> make -f /usr/src/xen/xen-master/xen/Rules.mk include/xen/compile.h
> >>>>> make[4]: Entering directory '/usr/src/xen/xen-master/xen'
> >>>>>  Xen 4.13-unstable
> >>>>> /bin/sh: python: command not found
> >>>>> make[4]: *** [Makefile:169: include/xen/compile.h] Error 127
> >>>> Here. The PYTHON invocation is from the hypervisor build, not the tools
> >>>> build.
> >>>>
> >>>> Thanks for the log.  I will have a closer look.
> >>>>
> >>>>> make[4]: Leaving directory '/usr/src/xen/xen-master/xen'
> >>>>> make[3]: *** [Makefile:137: /usr/src/xen/xen-master/xen/xen] Error 2
> >>>>> make[3]: Leaving directory '/usr/src/xen/xen-master/xen'
> >>>>> make[2]: *** [Makefile:45: install] Error 2
> >>>>> make[2]: Leaving directory '/usr/src/xen/xen-master/xen'
> >>>>> make[1]: *** [Makefile:123: install-xen] Error 2
> >>>>> make[1]: Leaving directory '/usr/src/xen/xen-master'
> >>>>> make: *** [Makefile:165: world] Error 2
> >>>>>
> >>>>>
> >>>>> Note the
> >>>>>
> >>>>> /bin/sh: python: command not found
> >>>>>
> >>> The issue here is on LFS there is no /usr/bin/python. So the hypervisor
> >>> build is broken because xen/include/compile.h invokes
> >>>
> >>>  @$(PYTHON) tools/fig-to-oct.py < .banner >> $@.new
> >>>
> >>> There are other appearances of PYTHON in hypervisor build, which are
> >>> equally broken.
> >>>
> >>> We had / have a policy to avoid making hypervisor build dependent on
> >>> configure. I have CC'ed more people on their opinions.
> >> Where has $(PYTHON) got lost?  It was specified correctly to begin with.
> > Where is it specified?
> 
> Oh - I see now.
> 
> It is specified for ./configure, but not for make.

Right.

It works for tools because tools build includes config/Tools.mk which
contains the correct python path. Tools.mk is generated by configure.
 
Obviously hypervisor build shouldn't include Tools.mk. Furthermore, the
policy of "hv shouldn't depend on configure" makes this route a no-go.

Either we change the policy, or we document the deficiency, or we come
up with some clever trick to probe.

Wei.

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