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Re: [libvirt] [PATCH] Fix test case qemuagenttest compilation.



Sorry about uploading a large attachment. 

And the build log link is:
https://app.box.com/s/gbjihylb3gvvh89xbn5m


----- Original Message -----
From: "Jincheng Miao" <jmiao redhat com>
To: "Eric Blake" <eblake redhat com>
Cc: libvir-list redhat com
Sent: Thursday, August 1, 2013 4:03:29 PM
Subject: Re: [libvirt] [PATCH] Fix test case qemuagenttest compilation.

hi Eric,

Bad luck, I test qemuagenttest build in rhel7.0, no error like this. Maybe it is a good new to libvirt.

And the gcc version is:
# rpm -q gcc libtool
gcc-4.8.0-2.el7.x86_64
libtool-2.4.2-14.el7.x86_64

And its compile cmdline likes:
gcc -std=gnu99 -Dabs_builddir=\"/root/software/libvirt/tests\" -I/usr/include/libxml2 -I/usr/include/p11-kit-1 -DGCRYPT_NO_DEPRECATED -W -Waddress -Waggressive-loop-optimizations -Wall -Warray-bounds -Wattributes -Wbad-function-cast -Wbuiltin-macro-redefined -Wcast-align -Wchar-subscripts -Wclobbered -Wcomment -Wcomments -Wcoverage-mismatch -Wcpp -Wdeprecated-declarations -Wdisabled-optimization -Wdiv-by-zero -Wdouble-promotion -Wempty-body -Wendif-labels -Wextra -Wformat-contains-nul -Wformat-extra-args -Wformat-security -Wformat-y2k -Wformat-zero-length -Wfree-nonheap-object -Wignored-qualifiers -Wimplicit -Wimplicit-function-declaration -Wimplicit-int -Winit-self -Winline -Wint-to-pointer-cast -Winvalid-memory-model -Winvalid-pch -Wjump-misses-init -Wlogical-op -Wmain -Wmaybe-uninitialized -Wmissing-braces -Wmissing-declarations -Wmissing-field-initializers -Wmissing-include-dirs -Wmissing-parameter-type -Wmissing-prototypes -Wmudflap -Wmultichar -Wnarrowing -Wnested-externs -Wnonnull -Wnormalized=nfc -Wold-style-declaration -Wold-style-definition -Woverflow -Woverride-init -Wpacked-bitfield-compat -Wparentheses -Wpointer-arith -Wpointer-sign -Wpointer-to-int-cast -Wpragmas -Wreturn-local-addr -Wreturn-type -Wsequence-point -Wshadow -Wsizeof-pointer-memaccess -Wstrict-aliasing -Wstrict-prototypes -Wsuggest-attribute=const -Wsuggest-attribute=format -Wsuggest-attribute=noreturn -Wsuggest-attribute=pure -Wswitch -Wsync-nand -Wtrampolines -Wtrigraphs -Wtype-limits -Wuninitialized -Wunknown-pragmas -Wunused -Wunused-but-set-parameter -Wunused-but-set-variable -Wunused-function -Wunused-label -Wunused-local-typedefs -Wunused-parameter -Wunused-result -Wunused-value -Wunused-variable -Wvarargs -Wvariadic-macros -Wvector-operation-performance -Wvolatile-register-var -Wwrite-strings -Wno-sign-compare -Wjump-misses-init -Wno-format-nonliteral -Wframe-larger-than=4096 -fstack-protector-all --param=ssp-buffer-size=4 -Wno-unused-command-line-argument -fexceptions -fasynchronous-unwind-tables -fdiagnostics-show-option -funit-at-a-time -fipa-pure-const -Wno-suggest-attribute=pure -Wno-suggest-attribute=const -Werror -g2 -O0 -o .libs/qemuagenttest qemuagenttest.o testutils.o testutilsqemu.o ../src/libvirt_qemu_probes.o  ../src/libvirt_probes.o -g2 -O0  ../src/.libs/libvirt_driver_qemu_impl.a ../src/.libs/libvirt_driver_network_impl.a ../src/.libs/libvirt.so -L/lib64 -lcap-ng -lyajl -lnl-route-3 -lnl-3 -laudit -ldevmapper -lxml2 -lnuma -lavahi-common -lavahi-client -ldbus-1 -lgnutls -lgcrypt -lsasl2 -lssh2 -lcurl -lselinux ../gnulib/lib/.libs/libgnu.a -lpthread -lutil ./.libs/libqemumonitortestutils.a -ldl -Wl,-rpath -Wl,/root/software/libvirt-inst/lib

But error in my fedora 19, the cmdline likes:
gcc -std=gnu99 -Dabs_builddir=\"/home/ryan/libvirt/tests\" -I/usr/include/libxml2 -W -Waddress -Waggressive-loop-optimizations -Wall -Warray-bounds -Wattributes -Wbad-function-cast -Wbuiltin-macro-redefined -Wcast-align -Wchar-subscripts -Wclobbered -Wcomment -Wcomments -Wcoverage-mismatch -Wcpp -Wdeprecated-declarations -Wdisabled-optimization -Wdiv-by-zero -Wdouble-promotion -Wempty-body -Wendif-labels -Wextra -Wformat-contains-nul -Wformat-extra-args -Wformat-security -Wformat-y2k -Wformat-zero-length -Wfree-nonheap-object -Wignored-qualifiers -Wimplicit -Wimplicit-function-declaration -Wimplicit-int -Winit-self -Winline -Wint-to-pointer-cast -Winvalid-memory-model -Winvalid-pch -Wjump-misses-init -Wlogical-op -Wmain -Wmaybe-uninitialized -Wmissing-braces -Wmissing-declarations -Wmissing-field-initializers -Wmissing-include-dirs -Wmissing-parameter-type -Wmissing-prototypes -Wmudflap -Wmultichar -Wnarrowing -Wnested-externs -Wnonnull -Wnormalized=nfc -Wold-style-declaration -Wold-style-definition -Woverflow -Woverride-init -Wpacked-bitfield-compat -Wparentheses -Wpointer-arith -Wpointer-sign -Wpointer-to-int-cast -Wpragmas -Wreturn-local-addr -Wreturn-type -Wsequence-point -Wshadow -Wsizeof-pointer-memaccess -Wstrict-aliasing -Wstrict-prototypes -Wsuggest-attribute=const -Wsuggest-attribute=format -Wsuggest-attribute=noreturn -Wsuggest-attribute=pure -Wswitch -Wsync-nand -Wtrampolines -Wtrigraphs -Wtype-limits -Wuninitialized -Wunknown-pragmas -Wunused -Wunused-but-set-parameter -Wunused-but-set-variable -Wunused-function -Wunused-label -Wunused-local-typedefs -Wunused-parameter -Wunused-result -Wunused-value -Wunused-variable -Wvarargs -Wvariadic-macros -Wvector-operation-performance -Wvolatile-register-var -Wwrite-strings -Wno-sign-compare -Wjump-misses-init -Wno-format-nonliteral -Wframe-larger-than=4096 -fstack-protector-all --param=ssp-buffer-size=4 -Wno-unused-command-line-argument -fexceptions -fasynchronous-unwind-tables -fdiagnostics-show-option -funit-at-a-time -fipa-pure-const -Wno-suggest-attribute=pure -Wno-suggest-attribute=const -Werror -g2 -O0 -o .libs/qemuagenttest qemuagenttest.o testutils.o testutilsqemu.o ../src/.libs/libvirt_driver_qemu_impl.a ../src/.libs/libvirt_driver_network_impl.a ../src/.libs/libvirt.so -lnl -ldevmapper -lxml2 -lselinux ../gnulib/lib/.libs/libgnu.a -lpthread -lutil ./.libs/libqemumonitortestutils.a -ldl -Wl,-rpath -Wl,/root/software/libvirt-inst/lib

And the attachment is the build log in my fedora 19.

So why cause this?

----- Original Message -----
From: "Jincheng Miao" <jmiao redhat com>
To: "Eric Blake" <eblake redhat com>
Cc: libvir-list redhat com
Sent: Thursday, August 1, 2013 11:50:18 AM
Subject: Re: [libvirt] [PATCH] Fix test case qemuagenttest compilation.

On 08/01/2013 05:48 AM, Eric Blake wrote:
>> When compiling qemuagenttest, a link error occurs like:
>> ./.libs/libqemumonitortestutils.a(qemumonitortestutils.o): In function `qemuMonitorTestFree':
>> libvirt/tests/qemumonitortestutils.c:346: undefined reference to `qemuMonitorClose'
>> ./.libs/libqemumonitortestutils.a(qemumonitortestutils.o): In function `qemuMonitorTestNew':
>> libvirt/tests/qemumonitortestutils.c:870: undefined reference to `qemuMonitorOpen'
>> collect2: error: ld returned 1 exit status
>
> What platform was this on?  Some distros are set up to be tolerant of
> lazy resolution, which masks issues like this (hence, I'm _not_ seeing
> this error on Fedora).


Actually I am using fedora 19 too.
And the toolchain is:
gcc-4.8.1-1.fc19.x86_64
libtool-2.4.2-16.fc19.x86_64

>> 
>> And I checked this error, it caused by the position of
>> libqemumonitortestutils.a in gcc arguments.
>> 
>> If libqemumonitortestutils.a before libvirt_driver_qemu_impl.a
>> and libvirt_driver_network_impl.a, the compilation passed.
>> Otherwise, failed.
>> 
>> I think this should be a gcc's bug, but nevermind,
>> just fix it in libvirt.
>
> No, it's not a bug in gcc, but an actual bug in libvirt.  If you can't
> rely on lazy resolution (such as on platforms like mingw, except that
> mingw doesn't build qemumonitortestutils in the first place), then
> libraries MUST be listed in the order in which later libraries satisfy
> symbols used by earlier libraries.

How do I check whether I am relying on lazy link?

>
> ACK, although I'd like to touch up your commit message (and in
> particular mention the platform where this matters) before pushing.
>
> 

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