tree cb132c54cdfb0201a6d2de1976870eadaca2f750
parent a1adbc724336b0a4185e34b63e18de03a8b119cf
author Craig Scott <craig.scott@crascit.com> 1547383458 +1100
committer Craig Scott <craig.scott@crascit.com> 1547410408 +1100

cmake: Ensure source and binary dirs are set

If only the source dir is provided, the binary dir is assumed
to be the working directory. If only the binary dir is provided
and it doesn't yet have a CMakeCache.txt to provide the
source dir, then the source dir is assumed to be the working
directory. This logic was not previously being handled
correctly when -S and/or -B options were involved.
Furthermore, when both were missing, no suitable error
message was provided and an empty string was used for
the build directory.

Fixes: #18707