[lttng-dev] ?==?utf-8?q? [PATCH]?==?utf-8?q? lttng-ust-common: link with liburcu explicitly

Alexander Kanavin alex at linutronix.de
Thu Dec 2 15:47:45 EST 2021 

Thanks for quick response!

I'm seeing this with lttng-ust 2.13.0:

| make[3]: Entering directory '/home/alex/development/poky/build-32/tmp/work/core2-32-poky-linux/lttng-ust/2_2.13.0-r0/build/tests/unit/libringbuffer'
| ../../../i686-poky-linux-libtool  --tag=CC   --mode=link i686-poky-linux-gcc  -m32 -march=core2 -mtune=core2 -msse3 -mfpmath=sse -fstack-protector-strong  -O2 -D_FORTIFY_SOURCE=2 -Wformat -Wformat-security -Werror=format-security --sysroot=/home/alex/development/poky/build-32/tmp/work/core2-32-poky-linux/lttng-ust/2_2.13.0-r0/recipe-sysroot -fno-strict-aliasing -Wall -Wextra -Wmissing-prototypes -Wmissing-declarations -Wnull-dereference -Wundef -Wshadow -Wjump-misses-init -Wsuggest-attribute=format -Wnested-externs -Wwrite-strings -Wformat=2 -Wstrict-aliasing -Wmissing-noreturn -Winit-self -Wduplicated-cond -Wduplicated-branches -Wlogical-op -Wno-sign-compare -Wno-missing-field-initializers -Wno-null-dereference -Wold-style-definition -Wstrict-prototypes  -pthread -O2 -pipe -g -feliminate-unused-debug-types -fmacro-prefix-map=/home/alex/development/poky/build-32/tmp/work/core2-32-poky-linux/lttng-ust/2_2.13.0-r0=/usr/src/debug/lttng-ust/2_2.13.0-r0                      -fdebug-prefix-map=/home/alex/development/poky/build-32/tmp/work/core2-32-poky-linux/lttng-ust/2_2.13.0-r0=/usr/src/debug/lttng-ust/2_2.13.0-r0                      -fdebug-prefix-map=/home/alex/development/poky/build-32/tmp/work/core2-32-poky-linux/lttng-ust/2_2.13.0-r0/recipe-sysroot=                      -fdebug-prefix-map=/home/alex/development/poky/build-32/tmp/work/core2-32-poky-linux/lttng-ust/2_2.13.0-r0/recipe-sysroot-native=   -Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed -fmacro-prefix-map=/home/alex/development/poky/build-32/tmp/work/core2-32-poky-linux/lttng-ust/2_2.13.0-r0=/usr/src/debug/lttng-ust/2_2.13.0-r0                      -fdebug-prefix-map=/home/alex/development/poky/build-32/tmp/work/core2-32-poky-linux/lttng-ust/2_2.13.0-r0=/usr/src/debug/lttng-ust/2_2.13.0-r0                      -fdebug-prefix-map=/home/alex/development/poky/build-32/tmp/work/core2-32-poky-linux/lttng-ust/2_2.13.0-r0/recipe-sysroot=                      -fdebug-prefix-map=/home/alex/development/poky/build-32/tmp/work/core2-32-poky-linux/lttng-ust/2_2.13.0-r0/recipe-sysroot-native=  -Wl,-z,relro,-z,now -o test_shm shm.o ../../../src/common/libringbuffer.la ../../../src/lib/lttng-ust-common/liblttng-ust-common.la ../../../src/common/libcommon.la ../../../tests/utils/libtap.a
| i686-poky-linux-libtool: link: i686-poky-linux-gcc -m32 -march=core2 -mtune=core2 -msse3 -mfpmath=sse -fstack-protector-strong -O2 -D_FORTIFY_SOURCE=2 -Wformat -Wformat-security -Werror=format-security --sysroot=/home/alex/development/poky/build-32/tmp/work/core2-32-poky-linux/lttng-ust/2_2.13.0-r0/recipe-sysroot -fno-strict-aliasing -Wall -Wextra -Wmissing-prototypes -Wmissing-declarations -Wnull-dereference -Wundef -Wshadow -Wjump-misses-init -Wsuggest-attribute=format -Wnested-externs -Wwrite-strings -Wformat=2 -Wstrict-aliasing -Wmissing-noreturn -Winit-self -Wduplicated-cond -Wduplicated-branches -Wlogical-op -Wno-sign-compare -Wno-missing-field-initializers -Wno-null-dereference -Wold-style-definition -Wstrict-prototypes -pthread -O2 -pipe -g -feliminate-unused-debug-types -fmacro-prefix-map=/home/alex/development/poky/build-32/tmp/work/core2-32-poky-linux/lttng-ust/2_2.13.0-r0=/usr/src/debug/lttng-ust/2_2.13.0-r0 -fdebug-prefix-map=/home/alex/development/poky/build-32/tmp/work/core2-32-poky-linux/lttng-ust/2_2.13.0-r0=/usr/src/debug/lttng-ust/2_2.13.0-r0 -fdebug-prefix-map=/home/alex/development/poky/build-32/tmp/work/core2-32-poky-linux/lttng-ust/2_2.13.0-r0/recipe-sysroot= -fdebug-prefix-map=/home/alex/development/poky/build-32/tmp/work/core2-32-poky-linux/lttng-ust/2_2.13.0-r0/recipe-sysroot-native= -Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed -fmacro-prefix-map=/home/alex/development/poky/build-32/tmp/work/core2-32-poky-linux/lttng-ust/2_2.13.0-r0=/usr/src/debug/lttng-ust/2_2.13.0-r0 -fdebug-prefix-map=/home/alex/development/poky/build-32/tmp/work/core2-32-poky-linux/lttng-ust/2_2.13.0-r0=/usr/src/debug/lttng-ust/2_2.13.0-r0 -fdebug-prefix-map=/home/alex/development/poky/build-32/tmp/work/core2-32-poky-linux/lttng-ust/2_2.13.0-r0/recipe-sysroot= -fdebug-prefix-map=/home/alex/development/poky/build-32/tmp/work/core2-32-poky-linux/lttng-ust/2_2.13.0-r0/recipe-sysroot-native= -Wl,-z -Wl,relro -Wl,-z -Wl,now -o .libs/test_shm shm.o  ../../../src/common/.libs/libringbuffer.a -lrt ../../../src/lib/lttng-ust-common/.libs/liblttng-ust-common.so -ldl ../../../src/common/.libs/libcommon.a ../../../tests/utils/libtap.a -pthread
| /home/alex/development/poky/build-32/tmp/work/core2-32-poky-linux/lttng-ust/2_2.13.0-r0/recipe-sysroot-native/usr/bin/i686-poky-linux/../../libexec/i686-poky-linux/gcc/i686-poky-linux/11.2.0/ld: ../../../src/lib/lttng-ust-common/.libs/liblttng-ust-common.so: undefined reference to `_compat_uatomic_set'
| /home/alex/development/poky/build-32/tmp/work/core2-32-poky-linux/lttng-ust/2_2.13.0-r0/recipe-sysroot-native/usr/bin/i686-poky-linux/../../libexec/i686-poky-linux/gcc/i686-poky-linux/11.2.0/ld: ../../../src/lib/lttng-ust-common/.libs/liblttng-ust-common.so: undefined reference to `_compat_uatomic_xchg'
| /home/alex/development/poky/build-32/tmp/work/core2-32-poky-linux/lttng-ust/2_2.13.0-r0/recipe-sysroot-native/usr/bin/i686-poky-linux/../../libexec/i686-poky-linux/gcc/i686-poky-linux/11.2.0/ld: ../../../src/lib/lttng-ust-common/.libs/liblttng-ust-common.so: undefined reference to `__rcu_cas_init'
| /home/alex/development/poky/build-32/tmp/work/core2-32-poky-linux/lttng-ust/2_2.13.0-r0/recipe-sysroot-native/usr/bin/i686-poky-linux/../../libexec/i686-poky-linux/gcc/i686-poky-linux/11.2.0/ld: ../../../src/lib/lttng-ust-common/.libs/liblttng-ust-common.so: undefined reference to `__rcu_cas_avail'
| /home/alex/development/poky/build-32/tmp/work/core2-32-poky-linux/lttng-ust/2_2.13.0-r0/recipe-sysroot-native/usr/bin/i686-poky-linux/../../libexec/i686-poky-linux/gcc/i686-poky-linux/11.2.0/ld: ../../../src/lib/lttng-ust-common/.libs/liblttng-ust-common.so: undefined reference to `_compat_uatomic_cmpxchg'
| collect2: error: ld returned 1 exit status
| make[3]: *** [Makefile:404: test_shm] Error 1
| make[3]: Leaving directory '/home/alex/development/poky/build-32/tmp/work/core2-32-poky-linux/lttng-ust/2_2.13.0-r0/build/tests/unit/libringbuffer'


Cheers,
Alex
 
On Thursday, December 02, 2021 21:20 CET, Jonathan Rajotte-Julien <jonathan.rajotte-julien at efficios.com> wrote: 
 
> Hi Alexander,
> 
> Thanks for sending this patch. Could you provide more details regarding the linking errors?
> 
> lttng-ust must not depends on liburcu at runtime since commit 10544ee8af31afb239e3dfa71cb2fe09d3de3771
> 
> commit 10544ee8af31afb239e3dfa71cb2fe09d3de3771
> Author: Mathieu Desnoyers <mathieu.desnoyers at efficios.com>
> Date:   Wed Nov 11 17:28:06 2020 -0500
> 
>     Remove runtime dependency on liburcu shared objects
>     
>     Remove the runtime dependency on:
>     
>     - liblurcu-bp.so
>     - liblurcu-cds.so
>     - compat futex code.
>     
>     By integrating those into the lttng-ust project.
>     
>     For rculfhash, only the minimum pieces needed by lttng-ust are
>     integrated (no auto-resize, no accounting).
>     
>     lttng-ust still requires liburcu at build time for header dependencies.
>     
>     Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers at efficios.com>
>     Change-Id: Idffb205b27b1bb0f972523c3ce3bdaf25bfe1710
> 
> 
> Cheers 
> 
> ----- Original Message -----
> > From: "Alexander Kanavin" <alex at linutronix.de>
> > To: "lttng-dev" <lttng-dev at lists.lttng.org>, "Francis Deslauriers" <francis.deslauriers at efficios.com>, "jonathan
> > rajotte-julien" <jonathan.rajotte-julien at efficios.com>
> > Cc: "Alexander Kanavin" <alex at linutronix.de>
> > Sent: Thursday, December 2, 2021 3:04:12 PM
> > Subject: [PATCH] lttng-ust-common: link with liburcu explicitly
> 
> > Otherwise linking errors are seen on x86-32.
> > ---
> > src/lib/lttng-ust-common/Makefile.am | 1 +
> > 1 file changed, 1 insertion(+)
> > 
> > diff --git a/src/lib/lttng-ust-common/Makefile.am
> > b/src/lib/lttng-ust-common/Makefile.am
> > index caeea2be..0130628c 100644
> > --- a/src/lib/lttng-ust-common/Makefile.am
> > +++ b/src/lib/lttng-ust-common/Makefile.am
> > @@ -15,6 +15,7 @@ liblttng_ust_common_la_SOURCES = \
> > 
> > liblttng_ust_common_la_LIBADD = \
> > 	$(top_builddir)/src/common/libcommon.la \
> > +	$(URCU_LIBS) \
> > 	$(DL_LIBS)
> > 
> > liblttng_ust_common_la_LDFLAGS = -no-undefined -version-info
> > $(LTTNG_UST_LIBRARY_VERSION)
> > --
> > 2.20.1
 
 
 
-- 
Alexander Kanavin
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