[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 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.

Wei.

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