  We present the current status of our lattice QCD determination of the charm
quark mass using $N_\mathrm{f}=2+1$ dynamical, non-perturbatively
$\mathrm{O}(a)$ improved Wilson fermions. A subset of CLS ensembles with five
different lattice spacings along the $\mathrm{Tr}[M_\mathrm{q}]=\text{const.}$
trajectory is used. For the computation of the correlation functions involving
valence charm quark propagators, we employ distance preconditioning to gain the
necessary precision. To stabilize the extrapolations to the physical point, we
consider different definitions of the bare charm quark mass and corresponding
renormalization procedures.
