Allow system/local Abseil master Add special handling when `absl_VERSION` is empty. This is the case when the `master` branch of `abseil-cpp` was installed using `CMake`. In that case check for VLOG availability through the CMake target `absl::absl_vlog_is_on`. Fixes: https://github.com/ceres-solver/ceres-solver/issues/1098 Change-Id: I3367aeb65caceb11558d8d6265dafe3ecc9a4875
Ceres Solver is an open source C++ library for modeling and solving large, complicated optimization problems. It is a feature rich, mature and performant library which has been used in production at Google since 2010. Ceres Solver can solve two kinds of problems.
Please see ceres-solver.org for more information.