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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Hypervisor build can't work without `python` (Was: Re: Xen commit 9b0bc91b3 possibly removed too much info from README)
On 17/04/2019 13:53, Andrew Cooper wrote: > On 17/04/2019 12:43, Juergen Gross wrote: >> On 17/04/2019 13:26, Wei Liu wrote: >>> On Wed, Apr 17, 2019 at 12:23:29PM +0100, Andrew Cooper wrote: >>>> On 17/04/2019 12:16, Wei Liu wrote: >>>>> On Wed, Apr 17, 2019 at 12:15:04PM +0100, Andrew Cooper wrote: >>>>>> On 17/04/2019 12:03, Wei Liu wrote: >>>>>>> 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. >>>>>> Given the shebang in all of our scripts, would `env python` be >>>>>> sufficiently clever trickery, or is that a can of worms we'd prefer not >>>>>> to open? >>>>> I already tried env python -- it didn't work. I think it searches PATHS >>>>> just like a shell would. >>>> So this particular use of python is completely trivial. It is an octal >>>> conversion on the banner string, to feed into a string for XEN_BANNER >>>> >>>> It exists because I removed a fork of figlet[1] from Xen's source tree >>>> with this script, but its probably just as easy to do with awk or >>>> something similar. >>>> >>>> ~Andrew >>>> >>>> [1] Yes - Xen did use to carry a fork of figlet which differed solely by >>>> being able to output an octal-escaped string. No - I have no words >>>> which can possibly be used to defend this... >>> >>> But there are other less trivial ones. See xen/include/Makefile. XSM >>> also relies on it to generate policy. What do you want to do with those? >> Shouldn't _some_ settings of configure end up in the hypervisor build, >> too? Like CC, AWK, SHELL, HOSTCC? >> >> Maybe we need a rather small basic_tools.mk containing those settings >> (with a sane default, of course)? > > In the past, there has been a vehement objection to requiring > ./configure before building Xen, and I still agree with this point of > view. Noone should need to run ./configure to be able to build a > freestanding item with no userspace connection. > > The problem Xen has is that we've got two vastly different projects in > the same source repo, and `make` runes which encompass both. > > Could we go with some compromise where the results of configure are used > if they are available, but for people not wanting to run configure, if > they've got non-standard standard tools, they need to pass them to make > as well? This is consistent with how cross compiling works. That should be fairly easy. Let Config.mk have: -include config/basic_tools.mk at the very beginning, with config/basic_tools.mk being created via configure and containing the basic tool variables: CC := gcc AWK := awk PYTHON := python3 ... As Config.mk will set those variables with defualt values in case they are empty all is fine then. Juergen _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel
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