It was totally subproject-unsafe, and setting a super bad example. This
is bad, because doxygen is annoying to get right and we occasionally
tell people to go use our example test case.
There is a fun nuance here, that makes doxygen unpredictably work on
some versions, and fail on others. Specifically, values must be quoted
in doxygen 1.8, but not in doxygen 1.9, or they break -- but only if the
output directory contains spaces. This was "fixed" in commit
ef91bacb7a
which actually caused it to act like an unquoted OUTPUT_DIRECTORY is not
provided at all, and then fixed for real in commit
eb3d1eb5ad
For portability, it is necessary to quote this just to be on the safe
side.
Fixes#11579
D lang compilers have an option -release (or similar) which turns off
asserts, contracts, and other runtime type checking. This patch wires
that up to the b_ndebug flag.
Fixes#7082