runTest.cc does not build in CUDA with c++17

[valassi]

During a cleanup of Makefiles in #281 I have moved cuda from c++14 to c++17 as was already the case for c++.

It turns out that runTest.cc now no longer builds in CUDA.

../src -I../../../../../tools -I../../../../../tools -I../../../../../test/googletest/googletest/include -I../../../../../test/include -I/usr/local/cuda-11.1/include/ -DUSE_NVTX -arch=compute_70 -use_fast_math -ccbin /cvmfs/sft.cern.ch/lcg/releases/gcc/9.2.0-afc57/x86_64-centos7/bin/g++ -DMGONGPU_FPTYPE_DOUBLE -DMGONGPU_CURAND_ONDEVICE
runTest.cc:138:27: error: expected ‘;’ at end of member declaration
  138 |   unique_ptr_host<fptype> hstRnarray  { hstMakeUnique<fptype>( nRnarray ) }; // AOSOA[npagR][nparf][np4][neppR] (nevt=npagR*neppR)
      |                           ^~~~~~~~~~~~~~~~~~~~~~~
      |                                                  ;
runTest.cc:138:50: error: expected unqualified-id before ‘<’ token
  138 |   unique_ptr_host<fptype> hstRnarray  { hstMakeUnique<fptype>( nRnarray ) }; // AOSOA[npagR][nparf][np4][neppR] (nevt=npagR*neppR)

... (AND SO ON)...

From https://stackoverflow.com/a/54247421 I suspected that the problem is the initialization of the struct data members outside the constructor. I made a small patch and this seems to solve the issue.

I am filing this for the record to keep track and document the issue

[valassi]

This should now be fixed by the linked commits , which will be merged in #281 - closing

[valassi]

Note that because of the issues discussed in #277, #281, #282, I have downgraded back from cuda 11.4 to cuda 11.1 as baseline. Unlike cuda 11.0, this allows using gcc10, but I am using now gcc10.2 (as my cvmfs 10.3 has some issues). I am using c++17 in gcc and c++14 in cuda.