Awesome. When you get everything sorted out and you're feeling
adventurous, you can add NEON optimization. In the cmake step, replace:
-DNEON_SIMD_ENABLE=OFF
with:
-DCMAKE_CXX_FLAGS:STRING="-march=armv7-a -mfloat-abi=hard -mfpu=neon
-mtune=cortex-a72" -DCMAKE_C_FLAGS:STRING="-march=armv7-a
-mfloat-abi=hard -mfpu=neon -mtune=cortex-a72"
-DCMAKE_ASM_FLAGS:STRING="-march=armv7-a -mfloat-abi=hard -mfpu=neon
-mtune=cortex-a72 -g"
Ron
On 4/6/21 05:15, Brendan Horsfield wrote:
Thanks for the tip Ron! It got me (almost) all the way home.
I can now interface with the USRP via the C++ API, which I couldn't do
previously.
Unfortunately there's still a niggling problem with the Python API (a
different one than before), but I will start a new thread to cover
that issue.
Cheers,
Brendan.
On Sun, Apr 4, 2021 at 11:53 AM Ron Economos <w...@comcast.net
<mailto:w...@comcast.net>> wrote:
This is just a guess, but you could try:
-DCMAKE_SHARED_LINKER_FLAGS="-latomic"
in addition.
Ron
On 4/3/21 18:34, Brendan Horsfield wrote:
Thanks Ken. As you suggested, I added
-DCMAKE_EXE_LINKER_FLAGS="-latomic" to the CMake call.
The good news is that the UHD build & installation process
completed successfully.
The bad news is that when I try to import the uhd module in
Python3, I get the following error:
pi@raspberrypi:~ $ python3
Python 3.7.3 (default, Jan 22 2021, 20:04:44)
[GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more
information.
>>> import uhd
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python3/dist-packages/uhd/__init__.py",
line 10, in <module>
from . import types
File "/usr/local/lib/python3/dist-packages/uhd/types.py", line
10, in <module>
from . import libpyuhd as lib
ImportError: /usr/local/lib/libuhd.so.4.0.0: undefined symbol:
__atomic_fetch_add_8
>>>
Did you encounter this problem too?
I guess the next step is to hack the "CMakeLists.txt" files as
per the link you sent me. Just to clarify one point first: If I
modify the CMakeLists.txt files, do I still need to include
-DCMAKE_EXE_LINKER_FLAGS="-latomic" in the CMake call?
Thanks,
Brendan.
On Sat, Apr 3, 2021 at 10:29 PM Clark (US), Kenneth C
<kenneth.c.cla...@boeing.com
<mailto:kenneth.c.cla...@boeing.com>> wrote:
I had the same problem build UHD on RPi4
Answer here:
https://gitlab.kitware.com/cmake/cmake/-/issues/21174
Add to CMake call:
-DCMAKE_EXE_LINKER_FLAGS="-latomic"
Regards,
Ken
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