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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