Trying to compile WiredTiger as optimised for debugging (-Og) results in a handful of -Werror=maybe-uninitialized compile errors, most of which just require variables to be initialised to zero.

To reproduce, follow the usual build process but add the -DCC_OPTIMIZE_LEVEL='-Og' flag:

mkdir build
cd build
cmake -DCC_OPTIMIZE_LEVEL='-Og' -G Ninja ../../
ninja

I hot-fixed this for a patch build and noticed that while compiling locally succeeded, additional errors were found in the patch build. I'd recommend running the compile job for all buildvariants to confirm this is fixed. The easiest way to do this is to remove all CC_OPTIMIZE_LEVEL mentions in evergreen.yml and set default_optimize_level "-Og" in cmake/base.cmake.