Merge branch 'master' into cache-scan-kernel-generation

.gitlab-ci.yml

doc/runtime_memory.rst

pyopencl/cffi_cl.py

pyopencl/version.py

src/c_wrapper/clhelper.h

src/c_wrapper/context.cpp

src/c_wrapper/device.cpp

src/c_wrapper/program.cpp

src/c_wrapper/wrap_cl_core.h