posix: redefinition of symbols while porting zeromq to zephyr #22722
Comments
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I had also a similar problem when i tried out to port asio (asio is already ported for esp32 in esp-idf). |
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As someone who ported more than project to Zephyr POSIX subsystem, and made numerous changes to that subsys to accommodate such porting efforts, I certainly can understand there're many more changes to make before Zephyr will be an equal member among POSIX systems (if that ever happens). ZMQ is definitely a hard case, because it's C++ and a large project overall. Something which caught my attention in the original description is:
There's no "west" in POSIX, so you're already not really using POSIX. I'd suggest to stick to POSIX tools when trying to work with POSIX subsystems, like Zephyr's one. At least, that would be my suggestion - please try to reproduce the issue without involving adhoc tools like west. |
Do you have a link to the PR? Maybe that could give me some additional ideas on what I need to do. |
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Finally found the solution to this bug. Due to my own doing the CMakeLists.txt in libzmq defined -D_GNU_SOURCE which caused the redefines. |
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Hi, is there any official support for ZeroMQ on Zephyr or this @jensschroer is the only one solution? |
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@pablogs9 As far as I am aware there isn't any official support for ZeroMQ on Zephyr. I discontinued my efforts on the direct port, as the library turned out to be too big for the MCU I was targeting. I am still interested in ZeroMQ on Zephyr, so I might start another try if time permits. |
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Thanks for the answer @jensschroer, I'm looking a broker-less pub-sub (ideally also req-rep) library that can be embedded in MCU like STM32F4 or so (~150 KB RAM, ~1 MB Flash). I'm targeting systems with RTOS and some POSIX compliance (by now: Zephyr RTOS, Nuttx and FreeRTOS + POSIX labs extensions). And ideally, it should be C++ free... I'm checking right now this nanomsg ng. Are you aware of any other solution? |
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@pablogs9 I have also looked at nanomsg-ng and tried to port it, after I got stuck with ZeroMQ. At the time I could not port nanomsg-ng as some systemcalls were missing. From what I remember eventfd was the main one - which has been added recently to Zephyr. I was considering to implement a subset of ZeroMQ in C in Zephyr, but have not found the time for it. |
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I think that I'm going to try nanomsg-ng. I'll keep you updated if success. |
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Any update on your progress @pablogs9? |
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@lakshjaisinghani we developed a DDS embedded solution, that is FreeRTOS compatible, so I guess that is easy to port to Zephyr: https://safe-dds.docs.eprosima.com/ |
Describe the bug
I am trying to port zeromq (libzmq) to Zephyr, using the posix subsystem.
I have patched libzmq to compile it as a module in Zephyr and created a small 'Hello World' app.
The compilation fails with several redefined symbols in the posix system.
To Reproduce
The easiest way to reproduce the issue is to clone my sample project.
I am using west for building the project.
Assuming a newly initialized zephyr installation (
west initfollowed bywest updateetc)Steps to reproduce the behavior:
zephyr)git clone https://github.com/jensschroer/zmqapp.gitgit clone https://github.com/jensschroer/libzmq.gitExpected behavior
The build should continue without redefined symbols.
Screenshots or console output
As example, the following is the error output from one file that files, but also including
-HoutputEnvironment (please complete the following information):
Additional context
I include the library libzmq in the app by using
ZEPHYR_EXTRA_MODULES.In order for west / cmake to add the zephyr posix include directories to the libzmq include paths,I had to explicitly add a
target_link_librariesdependency on theposix_subsysinlibzmq/CMakefile.txt(see libzmq/CMakefile.txt, search forposix_subsys).I just wanted to point this out, as I am not sure if this is the correct way or if it even might contribute to this problem.
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