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Post by robreido on Mar 14, 2023 10:31:35 GMT
N.B. - running on Windows 11 with OMNeT++ 4.6. I am attempting to build LibPTP with support for LibPLN, and have experienced a failure. I previously experienced issues attempting to do this, so I begun by deleting LibPLN and fftw from my disk, uninstalling CMake and removing all references to LibPLN and fftw from libPTP's project settings in OMNeT++. I then successfully cleaned and rebuilt libPTP. I then followed the install guide listed here for LibPLN and experienced no issues. CMake is installed in C:\Program Files\CMake, boost is in C:\boost, fftw is in D:\fftw-3.3.5-dll32. My libPTP directory is D:\omnetpp-4.6\ptp-sim\libPTP-master, and my libPLN directory is D:\omnetpp-4.6\ptp-sim\libPLN-master. I then added the required references to libPLN in libPTP's project settings in OMNeT++, leaving my project settings looking like this: ibb.co/xL5W0WLibb.co/JKSJT95I then (successfully) cleaned libPTP and attempted to build it. This resulted in a failure with this message: Creating shared library: ../out/gcc-debug/src/liblibPTP-master.dll
.tmplib17708(libPLN_TdGen.o): In function `ZN13cLibPLN_TdGen17AllocateResourcesEv':
D:\omnetpp-4.6\ptp-sim\libPTP-master\src/Hardware/HwClock/TdGen/libPLN_TdGen.cc:80: undefined reference to `LibPLN_Examples::cAvgOsc20MHz::cAvgOsc20MHz(unsigned int, bool)'
D:\omnetpp-4.6\ptp-sim\libPTP-master\src/Hardware/HwClock/TdGen/libPLN_TdGen.cc:83: undefined reference to `LibPLN_Examples::cWatchQuartz_20MHz::cWatchQuartz_20MHz(unsigned int, bool)'
collect2.exe: error: ld returned 1 exit status
make[1]: *** [../out/gcc-debug/src/liblibPTP-master.dll] Error 1
Makefile:505: recipe for target '../out/gcc-debug/src/liblibPTP-master.dll' failed
make[1]: Leaving directory '/d/omnetpp-4.6/ptp-sim/libPTP-master/src'
make: *** [all] Error 2
Makefile:2: recipe for target 'all' failedGiven that libPLN is appropriately referenced in my libPTP project settings, I can't see what would be causing this. Any help would be greatly appreciated. |
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Post by Wolfgang on Mar 14, 2023 15:05:38 GMT
Hi,
seems like the libPLN_Examples library is missing.
When building and installing libPLN, it should have installed a library called libPLN_Examples (e.g. on Linux the file is called libPLN_Examples.a). See the "make install"-part of the Install Guide.
Background info:
libPLN contains all the generic parts to generate Powerlaw noise. It also contains 2 example implementations of oscillators based on measurement data that I could find in other publications. Actually measuring such data on your own for an individual oscillator would be a huuuuuuuge effort, think of expensive lab equipment + multiple weeks duration. These examples are not strictly mandatory to use libPLN, so I moved them to there own istall target (make PLN_Examples, which should be called by make install if the Install Guide is correct).
The libPLN-powered oscillators in libPTP use these libPLN-examples, so for they are mandatory. And if they are not found it could lead to errors like that.
Kind regards, Wolfgang
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Post by robreido on Mar 14, 2023 20:26:48 GMT
Hi Wolfgang,
I do have a libPLN_Examples.a file in D:\omnetpp-4.6\ptp-sim\libPLN-master\build\Examples. I could potentially try adding this directory to the C++ includes for LibPTP and rebuilding. I will try that and let you know how it goes.
Rob
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Post by robreido on Mar 14, 2023 20:35:35 GMT
I will try that and let you know how it goes. Update: this has resulted in a build failure with the same message. I'm guessing this is likely a problem with my LibPLN build, I will take another look at the LibPLN build instructions and try to figure out why the Examples portion isn't building properly. |
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Post by Wolfgang on Mar 14, 2023 21:20:16 GMT
I could potentially try adding this directory to the C++ includes for LibPTP and rebuilding. No, that won't work. Header files are needed for compilation, and thus they have to be in the include directories. But this file is a library, it is needed during the linking step (that's when the 'undefined reference' happens). So compilation works fine, but linking is broken, because the linker can't find the library that contains the code for the example oscillators. So you need to find out how to tell your OMNeT++ environment to link with this library, this is probably somewhere in your C++ project settings. Sorry, I can't remember the details at the top of my head. I would assume that this detail should also be mentioned in the install guide of libPTP ... if not then this would be a bug in the install guide. regards, Wolfgang |
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Post by robreido on Mar 15, 2023 10:42:49 GMT
I've managed to link the examples library to LibPTP by adding the library path and library to the project's "C++ > General" settings, and linking the PLN_Examples library in the project's makemake file.
However, the build is still failing with this message:
Creating shared library: ../out/gcc-debug/src/liblibPTP-master.dll
D:/omnetpp-4.6/ptp-sim/libPLN-master/build/Examples/libPLN_Examples.a(AverageOscillator_20MHz.cpp.obj):AverageOscillator_20MHz.cpp:(.text+0x17): undefined reference to `TdOracle::TdOracle()'
D:/omnetpp-4.6/ptp-sim/libPLN-master/build/Examples/libPLN_Examples.a(AverageOscillator_20MHz.cpp.obj):AverageOscillator_20MHz.cpp:(.text+0x1d7): undefined reference to `TdOracle::~TdOracle()'
It looks like the examples library is trying to reference the TdOracle object but OMNeT++ can't find it - do you know where I might be able to find the TdOracle object so I can link it in my OMNeT settings?
Regards,
Rob
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Post by Wolfgang on Mar 15, 2023 12:01:22 GMT
TdOracle is a class in LibPLN (it is the part that tries to estimate a future time deviation). Is the LibPLN library also linked?
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Post by robreido on Mar 15, 2023 13:55:07 GMT
I've now managed to build LibPTP and PTP_Simulations with LibPLN support. I needed to do some extra configuration steps in the settings for both projects that weren't listed in the install guide (namely adding the fftw/LibPLN libraries and directories to the C++ config and makemake files), but both projects are now fully built. Thanks for your help!
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Post by Wolfgang on Mar 15, 2023 20:01:16 GMT
Hi Rob, Great!  Could you do me a favor? Would you please write up the missing steps in a detailed step-by-step list so we can add it to the Install Guide? Regards, Wolfgang |
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Post by gloria on Dec 30, 2023 12:35:40 GMT
I've now managed to build LibPTP and PTP_Simulations with LibPLN support. I needed to do some extra configuration steps in the settings for both projects that weren't listed in the install guide (namely adding the fftw/LibPLN libraries and directories to the C++ config and makemake files), but both projects are now fully built. Thanks for your help! I encountered the same problem. Could you please share how you resolved it? Thank you for your response. |
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