ROOT version 6.16.00 make error

[Reik]

ROOT version - 6.16.00
OS - Manjaro
GCC - 7.4
CUDA 10
Python 3.7.2

/usr/bin/ld: CMakeFiles/cppyy.dir/src/Pythonize.cxx.o: in function `(anonymous namespace)::vector_iter(_object*)':
/home/reik/Downloads/root-6.16.00/bindings/pyroot_experimental/cppyy/CPyCppyy/src/Pythonize.cxx:326: undefined reference to `_PyGC_generation0'
collect2: error: ld returned 1 exit status
make[2]: *** [bindings/pyroot_experimental/cppyy/CPyCppyy/CMakeFiles/cppyy.dir/build.make:492: lib/libcppyy.so] Error 1
make[1]: *** [CMakeFiles/Makefile2:30138: bindings/pyroot_experimental/cppyy/CPyCppyy/CMakeFiles/cppyy.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....

I downloaded the ROOT 6.16.00 tar file and tried to build it from source using CMake, and I encountered the above errors regarding pyroot_experimental during the make step.

[oshadura]

Hi!

It should be fix in https://github.com/root-project/root/commit/94412f7eab8d2cbdb4c83cd29215e7e2b185640f (I see it is a part of 6.16)

@etejedor Can you verify it please? I was trying to find Mattias on ROOT forum to be able to ask him but unsuccessfully

[etejedor]

Hi Reik

Thank you for reporting the issue. This looks like a problem building experimental PyROOT with Python3.7, since we have nightly builds with Python2.7 and Python3.6 that work ok.

I have opened a ticket to follow this issue:
https://sft.its.cern.ch/jira/browse/ROOT-9922

Cheers,
Enric