Experimental Physics and
Industrial Control System

Hey Josh,

Looking at your g++ call your IOC does not get linked against libpython3.8 which explains the undefined references to python bindings.

Can you execute the command `$(PYTHON_CONFIG) --ldflags --embed | sed 's/-[^l][^ ]*//g' | sed 's/-l//g'` by hand and check the output?

It should look like this:

$> python3-config --ldflags --embed | sed 's/-[^l][^ ]*//g' | sed 's/-l//g'
 python3.9 crypt pthread dl  util m m

This is for Klemen Vodopivec the author of `PyDevice`

1) thanks for making this 

2) I'm having some issues getting a simple ioc to build with pydev support 

I'm using a Raspberry Pi and linux-arm as the host architecture

for specific reasons: using EPICS base 3.15.6, python 3.8.10 on ubuntu for arm64 in a docker container

The module itself builds alright. and the testing ioc runs just fine

When I create a basic IOC, with makeBaseApp.pl using the ioc template, 

adding the lines as indicated:

```

analogCtrlIOC_DBD += pydev.dbd

analogCtrlIOC_LIBS += pydev

SYS_PROD_LIBS += $(shell $(PYTHON_CONFIG) --ldflags --embed | sed 's/-[^l][^ ]*//g' | sed 's/-l//g')

with the RELEASE file for the IOC pointed at the location of the support module

with `make` i get

```

/usr/bin/g++  -D_GNU_SOURCE -D_DEFAULT_SOURCE             -DUNIX  -Dlinux     -O3 -g   -Wall            -I. -I../O.Common -I. -I. -I.. -I../../../include/compiler/gcc -I../../../include/os/Linux -I../../../include    -I/epics/base/include/compiler/gcc -I/epics/base/include/os/Linux -I/epics/base/include        -c ../analogCtrlIOCMain.cpp
/bin/sh: 0: Illegal option --
/usr/bin/g++ -o analogCtrlIOC  -L/epics/analogCtrlIOC/lib/linux-arm -L/epics/base-3.15.6/lib/linux-arm -L/epics/support/PyDevice/lib/linux-arm -Wl,-rpath,/epics/analogCtrlIOC/lib/linux-arm -Wl,-rpath,/epics/base-3.15.6/lib/linux-arm -Wl,-rpath,/epics/support/PyDevice/lib/linux-arm           -rdynamic            analogCtrlIOC_registerRecordDeviceDriver.o analogCtrlIOCMain.o    -ldbRecStd -ldbCore -lca -lCom -lpydev  
/usr/bin/ld: /epics/support/PyDevice/lib/linux-arm/libpydev.so: undefined reference to `Py_InitializeEx'
/usr/bin/ld: /epics/support/PyDevice/lib/linux-arm/libpydev.so: undefined reference to `PyLong_AsLong'
/usr/bin/ld: /epics/support/PyDevice/lib/linux-arm/libpydev.so: undefined reference to `PyBool_Type'
/usr/bin/ld: /epics/support/PyDevice/lib/linux-arm/libpydev.so: undefined reference to `_Py_TrueStruct'
/usr/bin/ld: /epics/support/PyDevice/lib/linux-arm/libpydev.so: undefined reference to `PyType_IsSubtype'
/usr/bin/ld: /epics/support/PyDevice/lib/linux-arm/libpydev.so: undefined reference to `PyUnicode_AsASCIIString'
/usr/bin/ld: /epics/support/PyDevice/lib/linux-arm/libpydev.so: undefined reference to `PyEval_RestoreThread'
/usr/bin/ld: /epics/support/PyDevice/lib/linux-arm/libpydev.so: undefined reference to `_Py_NoneStruct'
/usr/bin/ld: /epics/support/PyDevice/lib/linux-arm/libpydev.so: undefined reference to `PyDict_SetItemString'
/usr/bin/ld: /epics/support/PyDevice/lib/linux-arm/libpydev.so: undefined reference to `PyList_Size'
/usr/bin/ld: /epics/support/PyDevice/lib/linux-arm/libpydev.so: undefined reference to `PyFloat_AsDouble'
/usr/bin/ld: /epics/support/PyDevice/lib/linux-arm/libpydev.so: undefined reference to `Py_Finalize'
/usr/bin/ld: /epics/support/PyDevice/lib/linux-arm/libpydev.so: undefined reference to `_Py_Dealloc'
/usr/bin/ld: /epics/support/PyDevice/lib/linux-arm/libpydev.so: undefined reference to `PyList_GetItem'
/usr/bin/ld: /epics/support/PyDevice/lib/linux-arm/libpydev.so: undefined reference to `PyErr_Clear'
/usr/bin/ld: /epics/support/PyDevice/lib/linux-arm/libpydev.so: undefined reference to `Py_IncRef'
/usr/bin/ld: /epics/support/PyDevice/lib/linux-arm/libpydev.so: undefined reference to `PyRun_StringFlags'
/usr/bin/ld: /epics/support/PyDevice/lib/linux-arm/libpydev.so: undefined reference to `Py_DecRef'
/usr/bin/ld: /epics/support/PyDevice/lib/linux-arm/libpydev.so: undefined reference to `PyDict_New'
/usr/bin/ld: /epics/support/PyDevice/lib/linux-arm/libpydev.so: undefined reference to `PyErr_SetString'
/usr/bin/ld: /epics/support/PyDevice/lib/linux-arm/libpydev.so: undefined reference to `PyBytes_AsString'
/usr/bin/ld: /epics/support/PyDevice/lib/linux-arm/libpydev.so: undefined reference to `PyExc_TypeError'
/usr/bin/ld: /epics/support/PyDevice/lib/linux-arm/libpydev.so: undefined reference to `PyEval_SaveThread'
/usr/bin/ld: /epics/support/PyDevice/lib/linux-arm/libpydev.so: undefined reference to `_Py_FalseStruct'
/usr/bin/ld: /epics/support/PyDevice/lib/linux-arm/libpydev.so: undefined reference to `PyEval_GetBuiltins'
/usr/bin/ld: /epics/support/PyDevice/lib/linux-arm/libpydev.so: undefined reference to `PyObject_IsTrue'
/usr/bin/ld: /epics/support/PyDevice/lib/linux-arm/libpydev.so: undefined reference to `PyModule_Create2'
/usr/bin/ld: /epics/support/PyDevice/lib/linux-arm/libpydev.so: undefined reference to `PyErr_Occurred'
/usr/bin/ld: /epics/support/PyDevice/lib/linux-arm/libpydev.so: undefined reference to `PyFloat_Type'
/usr/bin/ld: /epics/support/PyDevice/lib/linux-arm/libpydev.so: undefined reference to `PyArg_UnpackTuple'
/usr/bin/ld: /epics/support/PyDevice/lib/linux-arm/libpydev.so: undefined reference to `PyErr_Print'
/usr/bin/ld: /epics/support/PyDevice/lib/linux-arm/libpydev.so: undefined reference to `PyImport_AppendInittab'
collect2: error: ld returned 1 exit status
make[3]: *** [/epics/base/configure/RULES_BUILD:204: analogCtrlIOC] Error 1
make[3]: Leaving directory '/epics/analogCtrlIOC/analogCtrlIOCApp/src/O.linux-arm'
make[2]: *** [/epics/base/configure/RULES_ARCHS:58: install.linux-arm] Error 2
make[2]: Leaving directory '/epics/analogCtrlIOC/analogCtrlIOCApp/src'
make[1]: *** [/epics/base/configure/RULES_DIRS:84: src.install] Error 2
make[1]: Leaving directory '/epics/analogCtrlIOC/analogCtrlIOCApp'
make: *** [/epics/base/configure/RULES_DIRS:84: analogCtrlIOCApp.install] Error 2
root@daq-pi-002:/epics/analogCtrlIOC#

``` 

PYTHON_CONFIG is set for python3 

any thoughts?

Josh

-- 
Ruhr-Universität Bochum
AG der Experimentalphysik I
Dr. Florian Feldbauer
NB 2/131 / Fach 125
Universitätsstr. 150
D-44801 Bochum

Office: NB 2/134
Phone:  (+49)234 / 32-23563
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Re: PyDevice and an IOC Josh Fiddler via Tech-talk

References:

PyDevice and an IOC Josh Fiddler via Tech-talk

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