Gilles,
No I didn't. This is a fresh Raspbian for the Pi 2. I'm using the
05-05-raspbian-wheezy image, plus I did ant apt-get update
about a week ago.
Thanks!
Jeff
Jeff,
btw, did you try a pI 1 before a pi2 ?
I checked some forums, and you will likely have to upgrade gcc to 4.8
a simpler option could be linaro
https://www.raspberrypi.org/forums/viewtopic.php?f=56&t=98997
Cheers,
Gilles
On Tuesday, June 9, 2015, Gilles Gouaillardet
<gilles.gouaillar...@gmail.com <mailto:gilles.gouaillar...@gmail.com>>
wrote:
Jeff,
can you
gcc -march=armv7-a foo.c
Cheers,
Gilles
On Tuesday, June 9, 2015, Jeff Layton <layto...@att.net
<javascript:_e(%7B%7D,'cvml','layto...@att.net');>> wrote:
Gilles,
I'm not cross-compiling - I'm building on the Pi 2.
I'm not sure how to check if gcc can generate armv7 code.
I'm using Raspbian and I'm just using the default compilers
that come with it (I think it's gcc 4.6.3).
Thanks!
Jeff
Jeff,
dmb is available only on ARMv7 (Pi 2)
if i remember correctly, you are building Open MPI on
ARMv7 as well (Pi 2),
so this is not a cross compilation issue.
if you configure with -march=armv7, the relevant log is
libtool: compile: gcc -std=gnu99 -DHAVE_CONFIG_H -I.
-I../../opal/include -I../../orte/include
-I../../ompi/include -I../../oshmem/include
-I../../opal/mca/hwloc/hwloc191/hwloc/include/private/autogen
-I../../opal/mca/hwloc/hwloc191/hwloc/include/hwloc/autogen -I../..
-I/work/pi/src/openmpi-1.8.5/opal/mca/hwloc/hwloc191/hwloc/include
-I/work/pi/src/openmpi-1.8.5/opal/mca/event/libevent2021/libevent
-I/work/pi/src/openmpi-1.8.5/opal/mca/event/libevent2021/libevent/include
-march=armv7 -MT atomic-asm.lo -MD -MP -MF
.deps/atomic-asm.Tpo -c atomic-asm.S -fPIC -DPIC -o
.libs/atomic-asm.o^M
atomic-asm.S:1:0: error: target CPU does not support ARM mode
which is very puzzling ...
can you confirm
1) you are not cross compiling
2) your gcc can generate code for armv7 ?
Cheers,
Gilles
On 6/9/2015 1:48 AM, Jeff Layton wrote:
Jeff,
Sorry - I was traveling for a week and didn't have to
the RPi.
What happens if you don't supply CCASFLAGS at all?
The output from "make" is below. It died when it tried
to compile
atomic-local. It says the processor doesn't support
ARM mode "dmb".
Thanks!
Jeff
pi@raspberrypi /work/pi/src/openmpi-1.8.5 $ make
Making all in config
make[1]: Entering directory
'/work/pi/src/openmpi-1.8.5/config'
make[1]: Nothing to be done for 'all'.
make[1]: Leaving directory
'/work/pi/src/openmpi-1.8.5/config'
Making all in contrib
make[1]: Entering directory
'/work/pi/src/openmpi-1.8.5/contrib'
make[1]: Nothing to be done for 'all'.
make[1]: Leaving directory
'/work/pi/src/openmpi-1.8.5/contrib'
Making all in opal
make[1]: Entering directory
'/work/pi/src/openmpi-1.8.5/opal'
Making all in include
make[2]: Entering directory
'/work/pi/src/openmpi-1.8.5/opal/include'
make all-am
make[3]: Entering directory
'/work/pi/src/openmpi-1.8.5/opal/include'
make[3]: Leaving directory
'/work/pi/src/openmpi-1.8.5/opal/include'
make[2]: Leaving directory
'/work/pi/src/openmpi-1.8.5/opal/include'
Making all in asm
make[2]: Entering directory
'/work/pi/src/openmpi-1.8.5/opal/asm'
CC asm.lo
rm -f atomic-asm.S
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'
atomic-asm.S:86: Error: selected processor does not
support ARM mode `ldrexd r4,r5,[r0]'
atomic-asm.S:91: Error: selected processor does not
support ARM mode `strexd r1,r6,r7,[r0]'
atomic-asm.S:107: Error: selected processor does not
support ARM mode `ldrexd r4,r5,[r0]'
atomic-asm.S:112: Error: selected processor does not
support ARM mode `strexd r1,r6,r7,[r0]'
atomic-asm.S:115: Error: selected processor does not
support ARM mode `dmb'
atomic-asm.S:130: Error: selected processor does not
support ARM mode `ldrexd r4,r5,[r0]'
atomic-asm.S:135: Error: selected processor does not
support ARM mode `dmb'
atomic-asm.S:136: Error: selected processor does not
support ARM mode `strexd r1,r6,r7,[r0]'
Makefile:1608: recipe for target 'atomic-asm.lo' failed
make[2]: *** [atomic-asm.lo] Error 1
make[2]: Leaving directory
'/work/pi/src/openmpi-1.8.5/opal/asm'
Makefile:2149: recipe for target 'all-recursive' failed
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory
'/work/pi/src/openmpi-1.8.5/opal'
Makefile:1698: recipe for target 'all-recursive' failed
make: *** [all-recursive] Error 1
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