build problem with libxl

[Ján Tomko]

[adding Anthony PERARD to cc since his name is next to
xen-4.12.2-1.el7's ChangeLog entry]

Hi, Anthony!

On Thu, Feb 20, 2020 at 07:10:38PM +0100, Christoph wrote:
>https://wiki.centos.org/HowTos/Xen/Xen4QuickStart
>
>configure:53501: checking for LIBXL
>configure:53508: $PKG_CONFIG --exists --print-errors "xenlight >= 4.6.0"
>Package xenblktapctl was not found in the pkg-config search path.
>Perhaps you should add the directory containing `xenblktapctl.pc'
>to the PKG_CONFIG_PATH environment variable

It seems like xenlight's .pc file is broken if it references
a non-existent .pc file.

Jano

>Package 'xenblktapctl', required by 'Xenlight', not found
>configure:53511: $? = 1
>configure:53525: $PKG_CONFIG --exists --print-errors "xenlight >= 4.6.0"
>Package xenblktapctl was not found in the pkg-config search path.
>Perhaps you should add the directory containing `xenblktapctl.pc'
>to the PKG_CONFIG_PATH environment variable
>Package 'xenblktapctl', required by 'Xenlight', not found
>configure:53528: $? = 1
>configure:53542: result: no
>Package xenblktapctl was not found in the pkg-config search path.
>Perhaps you should add the directory containing `xenblktapctl.pc'
>to the PKG_CONFIG_PATH environment variable
>Package 'xenblktapctl', required by 'Xenlight', not found
>
>yum provides */xenblktapctl*
>shows:
>Loaded plugins: changelog, elrepo, fastestmirror, nvidia, rhnplugin
>This system is receiving updates from RHN Classic or Red Hat Satellite.
>No matches found
>
>such a file doesnt exist in the pkgs...
>
>but:
>
>yum provides */*blktapctl*
>Loaded plugins: changelog, elrepo, fastestmirror, nvidia, rhnplugin
>This system is receiving updates from RHN Classic or Red Hat Satellite.
>xen-devel-4.12.0.30.gb4f291b0ca-1.el7.x86_64 : Development libraries for
>Xen tools
>Repo        : centos7-x86_64-xen
>Matched from:
>Provides    : libtool(/usr/lib64/libblktapctl.la)
>Filename    : /usr/lib64/libblktapctl.la
>Filename    : /usr/lib64/libblktapctl.so
>
>xen-libs-4.12.2-1.el7.x86_64 : Libraries for Xen tools
>Repo        : centos7-x86_64-xen
>Matched from:
>Filename    : /usr/lib64/libblktapctl.so.0.1.1
>Filename    : /usr/lib64/libblktapctl.so.0
>
>etc...
>---
>------
>Greetz
>
>Am 20.02.2020 16:11, schrieb Ján Tomko:
>>On Thu, Feb 20, 2020 at 12:40:35PM +0100, Christoph wrote:
>>>I use centos 7 (7.7.1908).
>>>
>>>these pkgs are installed:
>>>
>>>xen-hypervisor-4.12.2-1.el7.x86_64
>>>xen-devel-4.12.2-1.el7.x86_64
>>>qemu-xen-4.12.1-1.el7.x86_64
>>>xen-runtime-4.12.2-1.el7.x86_64
>>>xen-licenses-4.12.2-1.el7.x86_64
>>>xen-4.12.2-1.el7.x86_64
>>>xen-libs-4.12.2-1.el7.x86_64
>>>xen-ovmf-20180825-1.gitef529e6ab.el7.x86_64
>>>
>>
>>Interesting, I did not know these packages existed.
>>
>>>even with --with-libxl it doesnt work...
>>
>>There was a bug in our code that ignored the error even if --with-libxl
>>was requested, patch sent:
>>https://www.redhat.com/archives/libvir-list/2020-February/msg00723.html
>>
>>However the mentioned xen-devel package seems to contain a xenlight.pc
>>config file for pkg-config:
>>https://cbs.centos.org/koji/buildinfo?buildID=27840
>>so it should work.
>>
>>Can you paste the config.log section beginning with 'checking for
>>LIBXL'?
>>
>>On my Fedora 31 where I build with libxl it looks like this:
>>configure:23591: checking for LIBXL
>>configure:23598: $PKG_CONFIG --exists --print-errors "xenlight >=
>>4.6.0"
>>configure:23601: $? = 0
>>configure:23615: $PKG_CONFIG --exists --print-errors "xenlight >=
>>4.6.0"
>>configure:23618: $? = 0
>>configure:23666: result: yes
>>configure:23718: checking libxlutil.h usability
>>configure:23718: clang -c -g -ggdb3   conftest.c >&5
>>configure:23718: $? = 0
>>configure:23718: result: yes
>>configure:23718: checking libxlutil.h presence
>>configure:23718: clang -E  conftest.c
>>configure:23718: $? = 0
>>configure:23718: result: yes
>>configure:23718: checking for libxlutil.h
>>configure:23718: result: yes
>>configure:23743: checking for xtl_createlogger_stdiostream in
>>-lxentoollog
>>configure:23768: clang -o conftest -g -ggdb3    conftest.c
>>-lxentoollog  -lutil -ltirpc -lpthread -ldl  >&5
>>configure:23768: $? = 0
>>configure:23777: result: yes
>>configure:23791: checking whether LIBXL_DOMAIN_TYPE_PVH is declared
>>configure:23791: clang -c -g -ggdb3   conftest.c >&5
>>configure:23791: $? = 0
>>configure:23791: result: yes
>>configure:23859: clang -o conftest -g -ggdb3    conftest.c -lutil
>>-ltirpc -lpthread -ldl  >&5
>>configure:23859: $? = 0
>>configure:23899: clang -o conftest -g -ggdb3    conftest.c -lutil
>>-ltirpc -lpthread -ldl  >&5
>>configure:23899: $? = 0
>>
>>Jano
>
>
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