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



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?

Wei.

> 
> ~Andrew

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