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Subject: Re: [OMPI users] Help: OpenMPI Compilation in Raspberry Pi
From: George Bosilca (bosilca_at_[hidden])
Date: 2013-01-20 11:07:41


Eric,

What do you think about the patch attached to ticket #3469 (https://svn.open-mpi.org/trac/ompi/ticket/3469). We might blend the two patches together, and have all the different ARM versions covered.

  Thanks,
    George.

On Jan 20, 2013, at 05:55 , Lee Eric <openlinuxsource_at_[hidden]> wrote:

> Hi,
>
> The above issue fixed w/ this patch I used:
> https://raw.github.com/sebhtml/patches/master/openmpi/Raspberry-Pi-openmpi-1.6.2.patch
>
> Is that possible OpenMPI can contain this patch in the future?
>
> Thanks.
>
> On Sun, Jan 20, 2013 at 3:13 AM, Lee Eric <openlinuxsource_at_[hidden]> wrote:
>> Hi,
>>
>> I just use --disable-mpif77 and --disable-mpif90 to let configure run
>> well. However, I know it's only tough workround. After configured
>> well, I encounter following error when run make:
>>
>> Making all in config
>> make[1]: Entering directory `/home/huli/Projects/openmpi-1.6.3/config'
>> make[1]: Nothing to be done for `all'.
>> make[1]: Leaving directory `/home/huli/Projects/openmpi-1.6.3/config'
>> Making all in contrib
>> make[1]: Entering directory `/home/huli/Projects/openmpi-1.6.3/contrib'
>> make[1]: Nothing to be done for `all'.
>> make[1]: Leaving directory `/home/huli/Projects/openmpi-1.6.3/contrib'
>> Making all in opal
>> make[1]: Entering directory `/home/huli/Projects/openmpi-1.6.3/opal'
>> Making all in include
>> make[2]: Entering directory `/home/huli/Projects/openmpi-1.6.3/opal/include'
>> make all-am
>> make[3]: Entering directory `/home/huli/Projects/openmpi-1.6.3/opal/include'
>> make[3]: Leaving directory `/home/huli/Projects/openmpi-1.6.3/opal/include'
>> make[2]: Leaving directory `/home/huli/Projects/openmpi-1.6.3/opal/include'
>> Making all in libltdl
>> make[2]: Entering directory `/home/huli/Projects/openmpi-1.6.3/opal/libltdl'
>> make all-am
>> make[3]: Entering directory `/home/huli/Projects/openmpi-1.6.3/opal/libltdl'
>> /bin/sh ./libtool --tag=CC --mode=compile
>> armv6-rpi-linux-gnueabi-gcc -DHAVE_CONFIG_H -I.
>> -DLT_CONFIG_H='<config.h>' -DLTDL -I. -I. -Ilibltdl -I./libltdl
>> -I./libltdl -I/home/huli/Projects/openmpi-1.6.3/opal/mca/hwloc/hwloc132/hwloc/include
>> -I/usr/include/infiniband -I/usr/include/infiniband -Ofast
>> -mfpu=vfp -mfloat-abi=hard -MT dlopen.lo -MD -MP -MF .deps/dlopen.Tpo
>> -c -o dlopen.lo `test -f 'loaders/dlopen.c' || echo
>> './'`loaders/dlopen.c
>> /bin/sh ./libtool --tag=CC --mode=compile
>> armv6-rpi-linux-gnueabi-gcc -DHAVE_CONFIG_H -I. -DLTDLOPEN=libltdlc
>> -DLT_CONFIG_H='<config.h>' -DLTDL -I. -I. -Ilibltdl -I./libltdl
>> -I./libltdl -I/home/huli/Projects/openmpi-1.6.3/opal/mca/hwloc/hwloc132/hwloc/include
>> -I/usr/include/infiniband -I/usr/include/infiniband -Ofast
>> -mfpu=vfp -mfloat-abi=hard -MT libltdlc_la-preopen.lo -MD -MP -MF
>> .deps/libltdlc_la-preopen.Tpo -c -o libltdlc_la-preopen.lo `test -f
>> 'loaders/preopen.c' || echo './'`loaders/preopen.c
>> /bin/sh ./libtool --tag=CC --mode=compile
>> armv6-rpi-linux-gnueabi-gcc -DHAVE_CONFIG_H -I. -DLTDLOPEN=libltdlc
>> -DLT_CONFIG_H='<config.h>' -DLTDL -I. -I. -Ilibltdl -I./libltdl
>> -I./libltdl -I/home/huli/Projects/openmpi-1.6.3/opal/mca/hwloc/hwloc132/hwloc/include
>> -I/usr/include/infiniband -I/usr/include/infiniband -Ofast
>> -mfpu=vfp -mfloat-abi=hard -MT libltdlc_la-lt__alloc.lo -MD -MP -MF
>> .deps/libltdlc_la-lt__alloc.Tpo -c -o libltdlc_la-lt__alloc.lo `test
>> -f 'lt__alloc.c' || echo './'`lt__alloc.c
>> /bin/sh ./libtool --tag=CC --mode=compile
>> armv6-rpi-linux-gnueabi-gcc -DHAVE_CONFIG_H -I. -DLTDLOPEN=libltdlc
>> -DLT_CONFIG_H='<config.h>' -DLTDL -I. -I. -Ilibltdl -I./libltdl
>> -I./libltdl -I/home/huli/Projects/openmpi-1.6.3/opal/mca/hwloc/hwloc132/hwloc/include
>> -I/usr/include/infiniband -I/usr/include/infiniband -Ofast
>> -mfpu=vfp -mfloat-abi=hard -MT libltdlc_la-lt_dlloader.lo -MD -MP -MF
>> .deps/libltdlc_la-lt_dlloader.Tpo -c -o libltdlc_la-lt_dlloader.lo
>> `test -f 'lt_dlloader.c' || echo './'`lt_dlloader.c
>> /bin/sh ./libtool --tag=CC --mode=compile
>> armv6-rpi-linux-gnueabi-gcc -DHAVE_CONFIG_H -I. -DLTDLOPEN=libltdlc
>> -DLT_CONFIG_H='<config.h>' -DLTDL -I. -I. -Ilibltdl -I./libltdl
>> -I./libltdl -I/home/huli/Projects/openmpi-1.6.3/opal/mca/hwloc/hwloc132/hwloc/include
>> -I/usr/include/infiniband -I/usr/include/infiniband -Ofast
>> -mfpu=vfp -mfloat-abi=hard -MT libltdlc_la-lt_error.lo -MD -MP -MF
>> .deps/libltdlc_la-lt_error.Tpo -c -o libltdlc_la-lt_error.lo `test -f
>> 'lt_error.c' || echo './'`lt_error.c
>> /bin/sh ./libtool --tag=CC --mode=compile
>> armv6-rpi-linux-gnueabi-gcc -DHAVE_CONFIG_H -I. -DLTDLOPEN=libltdlc
>> -DLT_CONFIG_H='<config.h>' -DLTDL -I. -I. -Ilibltdl -I./libltdl
>> -I./libltdl -I/home/huli/Projects/openmpi-1.6.3/opal/mca/hwloc/hwloc132/hwloc/include
>> -I/usr/include/infiniband -I/usr/include/infiniband -Ofast
>> -mfpu=vfp -mfloat-abi=hard -MT libltdlc_la-ltdl.lo -MD -MP -MF
>> .deps/libltdlc_la-ltdl.Tpo -c -o libltdlc_la-ltdl.lo `test -f 'ltdl.c'
>> || echo './'`ltdl.c
>> /bin/sh ./libtool --tag=CC --mode=compile
>> armv6-rpi-linux-gnueabi-gcc -DHAVE_CONFIG_H -I. -DLTDLOPEN=libltdlc
>> -DLT_CONFIG_H='<config.h>' -DLTDL -I. -I. -Ilibltdl -I./libltdl
>> -I./libltdl -I/home/huli/Projects/openmpi-1.6.3/opal/mca/hwloc/hwloc132/hwloc/include
>> -I/usr/include/infiniband -I/usr/include/infiniband -Ofast
>> -mfpu=vfp -mfloat-abi=hard -MT libltdlc_la-slist.lo -MD -MP -MF
>> .deps/libltdlc_la-slist.Tpo -c -o libltdlc_la-slist.lo `test -f
>> 'slist.c' || echo './'`slist.c
>> /bin/sh ./libtool --tag=CC --mode=compile
>> armv6-rpi-linux-gnueabi-gcc -DHAVE_CONFIG_H -I.
>> -DLT_CONFIG_H='<config.h>' -DLTDL -I. -I. -Ilibltdl -I./libltdl
>> -I./libltdl -I/home/huli/Projects/openmpi-1.6.3/opal/mca/hwloc/hwloc132/hwloc/include
>> -I/usr/include/infiniband -I/usr/include/infiniband -Ofast
>> -mfpu=vfp -mfloat-abi=hard -MT lt__strl.lo -MD -MP -MF
>> .deps/lt__strl.Tpo -c -o lt__strl.lo lt__strl.c
>> libtool: compile: armv6-rpi-linux-gnueabi-gcc -DHAVE_CONFIG_H -I.
>> -DLTDLOPEN=libltdlc "-DLT_CONFIG_H=<config.h>" -DLTDL -I. -I.
>> -Ilibltdl -I./libltdl -I./libltdl
>> -I/home/huli/Projects/openmpi-1.6.3/opal/mca/hwloc/hwloc132/hwloc/include
>> -I/usr/include/infiniband -I/usr/include/infiniband -Ofast -mfpu=vfp
>> -mfloat-abi=hard -MT libltdlc_la-lt__alloc.lo -MD -MP -MF
>> .deps/libltdlc_la-lt__alloc.Tpo -c lt__alloc.c -fPIC -DPIC -o
>> .libs/libltdlc_la-lt__alloc.o
>> libtool: compile: armv6-rpi-linux-gnueabi-gcc -DHAVE_CONFIG_H -I.
>> -DLTDLOPEN=libltdlc "-DLT_CONFIG_H=<config.h>" -DLTDL -I. -I.
>> -Ilibltdl -I./libltdl -I./libltdl
>> -I/home/huli/Projects/openmpi-1.6.3/opal/mca/hwloc/hwloc132/hwloc/include
>> -I/usr/include/infiniband -I/usr/include/infiniband -Ofast -mfpu=vfp
>> -mfloat-abi=hard -MT libltdlc_la-preopen.lo -MD -MP -MF
>> .deps/libltdlc_la-preopen.Tpo -c loaders/preopen.c -fPIC -DPIC -o
>> .libs/libltdlc_la-preopen.o
>> libtool: compile: armv6-rpi-linux-gnueabi-gcc -DHAVE_CONFIG_H -I.
>> -DLTDLOPEN=libltdlc "-DLT_CONFIG_H=<config.h>" -DLTDL -I. -I.
>> -Ilibltdl -I./libltdl -I./libltdl
>> -I/home/huli/Projects/openmpi-1.6.3/opal/mca/hwloc/hwloc132/hwloc/include
>> -I/usr/include/infiniband -I/usr/include/infiniband -Ofast -mfpu=vfp
>> -mfloat-abi=hard -MT libltdlc_la-lt_error.lo -MD -MP -MF
>> .deps/libltdlc_la-lt_error.Tpo -c lt_error.c -fPIC -DPIC -o
>> .libs/libltdlc_la-lt_error.o
>> libtool: compile: armv6-rpi-linux-gnueabi-gcc -DHAVE_CONFIG_H -I.
>> "-DLT_CONFIG_H=<config.h>" -DLTDL -I. -I. -Ilibltdl -I./libltdl
>> -I./libltdl -I/home/huli/Projects/openmpi-1.6.3/opal/mca/hwloc/hwloc132/hwloc/include
>> -I/usr/include/infiniband -I/usr/include/infiniband -Ofast -mfpu=vfp
>> -mfloat-abi=hard -MT lt__strl.lo -MD -MP -MF .deps/lt__strl.Tpo -c
>> lt__strl.c -fPIC -DPIC -o .libs/lt__strl.o
>> libtool: compile: armv6-rpi-linux-gnueabi-gcc -DHAVE_CONFIG_H -I.
>> "-DLT_CONFIG_H=<config.h>" -DLTDL -I. -I. -Ilibltdl -I./libltdl
>> -I./libltdl -I/home/huli/Projects/openmpi-1.6.3/opal/mca/hwloc/hwloc132/hwloc/include
>> -I/usr/include/infiniband -I/usr/include/infiniband -Ofast -mfpu=vfp
>> -mfloat-abi=hard -MT dlopen.lo -MD -MP -MF .deps/dlopen.Tpo -c
>> loaders/dlopen.c -fPIC -DPIC -o .libs/dlopen.o
>> libtool: compile: armv6-rpi-linux-gnueabi-gcc -DHAVE_CONFIG_H -I.
>> -DLTDLOPEN=libltdlc "-DLT_CONFIG_H=<config.h>" -DLTDL -I. -I.
>> -Ilibltdl -I./libltdl -I./libltdl
>> -I/home/huli/Projects/openmpi-1.6.3/opal/mca/hwloc/hwloc132/hwloc/include
>> -I/usr/include/infiniband -I/usr/include/infiniband -Ofast -mfpu=vfp
>> -mfloat-abi=hard -MT libltdlc_la-lt_dlloader.lo -MD -MP -MF
>> .deps/libltdlc_la-lt_dlloader.Tpo -c lt_dlloader.c -fPIC -DPIC -o
>> .libs/libltdlc_la-lt_dlloader.o
>> libtool: compile: armv6-rpi-linux-gnueabi-gcc -DHAVE_CONFIG_H -I.
>> -DLTDLOPEN=libltdlc "-DLT_CONFIG_H=<config.h>" -DLTDL -I. -I.
>> -Ilibltdl -I./libltdl -I./libltdl
>> -I/home/huli/Projects/openmpi-1.6.3/opal/mca/hwloc/hwloc132/hwloc/include
>> -I/usr/include/infiniband -I/usr/include/infiniband -Ofast -mfpu=vfp
>> -mfloat-abi=hard -MT libltdlc_la-ltdl.lo -MD -MP -MF
>> .deps/libltdlc_la-ltdl.Tpo -c ltdl.c -fPIC -DPIC -o
>> .libs/libltdlc_la-ltdl.o
>> libtool: compile: armv6-rpi-linux-gnueabi-gcc -DHAVE_CONFIG_H -I.
>> -DLTDLOPEN=libltdlc "-DLT_CONFIG_H=<config.h>" -DLTDL -I. -I.
>> -Ilibltdl -I./libltdl -I./libltdl
>> -I/home/huli/Projects/openmpi-1.6.3/opal/mca/hwloc/hwloc132/hwloc/include
>> -I/usr/include/infiniband -I/usr/include/infiniband -Ofast -mfpu=vfp
>> -mfloat-abi=hard -MT libltdlc_la-slist.lo -MD -MP -MF
>> .deps/libltdlc_la-slist.Tpo -c slist.c -fPIC -DPIC -o
>> .libs/libltdlc_la-slist.o
>> mv -f .deps/dlopen.Tpo .deps/dlopen.Plo
>> /bin/sh ./libtool --tag=CC --mode=link armv6-rpi-linux-gnueabi-gcc
>> -Ofast -mfpu=vfp -mfloat-abi=hard -module -avoid-version -o dlopen.la
>> dlopen.lo -ldl -ldl -lrt -lnsl -lutil -lm
>> mv -f .deps/libltdlc_la-lt__alloc.Tpo .deps/libltdlc_la-lt__alloc.Plo
>> mv -f .deps/lt__strl.Tpo .deps/lt__strl.Plo
>> mv -f .deps/libltdlc_la-lt_error.Tpo .deps/libltdlc_la-lt_error.Plo
>> mv -f .deps/libltdlc_la-preopen.Tpo .deps/libltdlc_la-preopen.Plo
>> mv -f .deps/libltdlc_la-lt_dlloader.Tpo .deps/libltdlc_la-lt_dlloader.Plo
>> libtool: link: armv6-rpi-linux-gnueabi-ar cru .libs/dlopen.a .libs/dlopen.o
>> libtool: link: armv6-rpi-linux-gnueabi-ranlib .libs/dlopen.a
>> mv -f .deps/libltdlc_la-slist.Tpo .deps/libltdlc_la-slist.Plo
>> libtool: link: ( cd ".libs" && rm -f "dlopen.la" && ln -s
>> "../dlopen.la" "dlopen.la" )
>> mv -f .deps/libltdlc_la-ltdl.Tpo .deps/libltdlc_la-ltdl.Plo
>> /bin/sh ./libtool --tag=CC --mode=link armv6-rpi-linux-gnueabi-gcc
>> -Ofast -mfpu=vfp -mfloat-abi=hard -no-undefined -dlpreopen dlopen.la
>> -o libltdlc.la libltdlc_la-preopen.lo libltdlc_la-lt__alloc.lo
>> libltdlc_la-lt_dlloader.lo libltdlc_la-lt_error.lo libltdlc_la-ltdl.lo
>> libltdlc_la-slist.lo lt__strl.lo -ldl -lrt -lnsl -lutil -lm
>> libtool: link: rm -f .libs/libltdlc.nm .libs/libltdlc.nmS .libs/libltdlc.nmT
>> libtool: link: (cd .libs && armv6-rpi-linux-gnueabi-gcc -Ofast
>> -mfpu=vfp -mfloat-abi=hard -c -fno-builtin -fPIC -DPIC "libltdlcS.c")
>> libtool: link: rm -f ".libs/libltdlcS.c" ".libs/libltdlc.nm"
>> ".libs/libltdlc.nmS" ".libs/libltdlc.nmT"
>> libtool: link: (cd .libs/libltdlc.lax/dlopen.a &&
>> armv6-rpi-linux-gnueabi-ar x
>> "/home/huli/Projects/openmpi-1.6.3/opal/libltdl/./.libs/dlopen.a")
>> libtool: link: armv6-rpi-linux-gnueabi-ar cru .libs/libltdlc.a
>> .libs/libltdlc_la-preopen.o .libs/libltdlc_la-lt__alloc.o
>> .libs/libltdlc_la-lt_dlloader.o .libs/libltdlc_la-lt_error.o
>> .libs/libltdlc_la-ltdl.o .libs/libltdlc_la-slist.o .libs/lt__strl.o
>> .libs/libltdlcS.o .libs/libltdlc.lax/dlopen.a/dlopen.o
>> libtool: link: armv6-rpi-linux-gnueabi-ranlib .libs/libltdlc.a
>> libtool: link: rm -fr .libs/libltdlc.lax
>> libtool: link: ( cd ".libs" && rm -f "libltdlc.la" && ln -s
>> "../libltdlc.la" "libltdlc.la" )
>> make[3]: Leaving directory `/home/huli/Projects/openmpi-1.6.3/opal/libltdl'
>> make[2]: Leaving directory `/home/huli/Projects/openmpi-1.6.3/opal/libltdl'
>> Making all in asm
>> make[2]: Entering directory `/home/huli/Projects/openmpi-1.6.3/opal/asm'
>> rm -f atomic-asm.S
>> CC asm.lo
>> ln -s "../../opal/asm/generated/atomic-local.s" atomic-asm.S
>> CPPAS atomic-asm.lo
>> atomic-asm.S: Assembler messages:
>> atomic-asm.S:7: Error: selected processor does not support ARM mode `dmb'
>> atomic-asm.S:15: Error: selected processor does not support ARM mode `dmb'
>> atomic-asm.S:23: Error: selected processor does not support ARM mode `dmb'
>> atomic-asm.S:55: Error: selected processor does not support ARM mode `dmb'
>> atomic-asm.S:70: Error: selected processor does not support ARM mode `dmb'
>> make[2]: *** [atomic-asm.lo] Error 1
>> make[2]: *** Waiting for unfinished jobs....
>> make[2]: Leaving directory `/home/huli/Projects/openmpi-1.6.3/opal/asm'
>> make[1]: *** [all-recursive] Error 1
>> make[1]: Leaving directory `/home/huli/Projects/openmpi-1.6.3/opal'
>> make: *** [all-recursive] Error 1
>>
>> Here's my toolchain's gcc details.
>>
>> [huli_at_localhost openmpi-1.6.3]$ armv6-rpi-linux-gnueabi-gcc -v
>> Using built-in specs.
>> COLLECT_GCC=armv6-rpi-linux-gnueabi-gcc
>> COLLECT_LTO_WRAPPER=/home/huli/Projects/arm-devel-rpi/libexec/gcc/arm-rpi-linux-gnueabi/4.7.3/lto-wrapper
>> Target: arm-rpi-linux-gnueabi
>> Configured with:
>> /home/huli/Projects/ct-rpi/.build/src/gcc-linaro-4.7-2012.10/configure
>> --build=x86_64-build_unknown-linux-gnu
>> --host=x86_64-build_unknown-linux-gnu --target=arm-rpi-linux-gnueabi
>> --prefix=/home/huli/Projects/arm-devel-rpi
>> --with-sysroot=/home/huli/Projects/arm-devel-rpi/arm-rpi-linux-gnueabi/sysroot
>> --enable-languages=c,c++,fortran --with-arch=armv6zk
>> --with-cpu=arm1176jzf-s --with-tune=arm1176jzf-s --with-fpu=vfp
>> --with-float=hard --with-pkgversion='crosstool-NG 1.17.0'
>> --enable-__cxa_atexit --disable-libmudflap --disable-libgomp
>> --disable-libssp --disable-libquadmath --disable-libquadmath-support
>> --with-gmp=/home/huli/Projects/ct-rpi/.build/arm-rpi-linux-gnueabi/buildtools
>> --with-mpfr=/home/huli/Projects/ct-rpi/.build/arm-rpi-linux-gnueabi/buildtools
>> --with-mpc=/home/huli/Projects/ct-rpi/.build/arm-rpi-linux-gnueabi/buildtools
>> --with-ppl=/home/huli/Projects/ct-rpi/.build/arm-rpi-linux-gnueabi/buildtools
>> --with-cloog=/home/huli/Projects/ct-rpi/.build/arm-rpi-linux-gnueabi/buildtools
>> --with-libelf=/home/huli/Projects/ct-rpi/.build/arm-rpi-linux-gnueabi/buildtools
>> --with-host-libstdcxx='-static-libgcc -Wl,-Bstatic,-lstdc++,-Bdynamic
>> -lm -L/home/huli/Projects/ct-rpi/.build/arm-rpi-linux-gnueabi/buildtools/lib
>> -lpwl' --enable-threads=posix --enable-target-optspace --disable-nls
>> --disable-multilib
>> --with-local-prefix=/home/huli/Projects/arm-devel-rpi/arm-rpi-linux-gnueabi/sysroot
>> --enable-c99 --enable-long-long --with-float=hard
>> Thread model: posix
>> gcc version 4.7.3 20121001 (prerelease) (crosstool-NG 1.17.0)
>>
>> Anyone have idea?
>>
>> Thanks.
>>
>> Eric
>>
>> On Sun, Jan 20, 2013 at 2:05 AM, Lee Eric <openlinuxsource_at_[hidden]> wrote:
>>> Hi,
>>>
>>> The cross-compile issue I fixed. Check following source code:
>>> opal_config_asm.m4:897: [AC_MSG_ERROR([No atomic primitives available
>>> for $host])])
>>>
>>> It seems that checks the toolchain's tuple is one of: armv7* or armv6*
>>> or armv5*. I have recompiled my toolchain and no such error occurred.
>>> However, I hit another issue about fortran as configure running.
>>>
>>> *** Fortran 90/95 compiler
>>> checking for armv6-rpi-linux-gnueabi-gfortran...
>>> armv6-rpi-linux-gnueabi-gfortran
>>> checking whether we are using the GNU Fortran compiler... yes
>>> checking whether armv6-rpi-linux-gnueabi-gfortran accepts -g... yes
>>> checking if Fortran 77 compiler works... links (cross compiling)
>>> checking armv6-rpi-linux-gnueabi-gfortran external symbol
>>> convention... single underscore
>>> checking if C and Fortran 77 are link compatible... yes
>>> checking to see if F77 compiler likes the C++ exception flags...
>>> skipped (no C++ exceptions flags)
>>> checking to see if mpif77/mpif90 compilers need additional linker flags... none
>>> checking if Fortran 77 compiler supports CHARACTER... yes
>>> checking size of Fortran 77 CHARACTER... configure: error: Can not
>>> determine size of CHARACTER when cross-compiling
>>>
>>> Any hint? Thanks.
>>>
>>> Eric
>>>
>>> On Sat, Jan 19, 2013 at 10:08 PM, Lee Eric <openlinuxsource_at_[hidden]> wrote:
>>>> Any heads up? Thanks.
>>>>
>>>> On Fri, Jan 18, 2013 at 5:28 AM, Jeff Squyres (jsquyres)
>>>> <jsquyres_at_[hidden]> wrote:
>>>>> On Jan 16, 2013, at 6:41 AM, Leif Lindholm <Leif.Lindholm_at_[hidden]> wrote:
>>>>>
>>>>>> That isn't, technically speaking, correct for the Raspberry Pi - but it is a workaround if you know you will never actually use the asm implementations of the atomics, but only the inline C ones..
>>>>>>
>>>>>> This sort of hides the problem that the dedicated barrier instructions were not available in ARMv6 (it used "system control coprocessor operations" instead.
>>>>>>
>>>>>> If you ever executed the asm implementation, you would trigger an undefined instruction exception on the Pi.
>>>>>
>>>>> Hah; sweet. Ok.
>>>>>
>>>>> So what's the right answer? Would it be acceptable to use a no-op for this operation on such architectures?
>>>>>
>>>>> --
>>>>> Jeff Squyres
>>>>> jsquyres_at_[hidden]
>>>>> For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> users mailing list
>>>>> users_at_[hidden]
>>>>> http://www.open-mpi.org/mailman/listinfo.cgi/users
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