[CMake] Why is CMakeOutput.log created for one project but not another?

[Christian Convey]

Hi guys,

Someone pointed out that when we cmake one of our projects, a file
CMakeOutput.log and a directory CMakeTmp/ get created.  It looks like
they're being used to see if the function "strcasecmp()" works on this
platform.

But we have another project that this doesn't happen at all for, even
when we build it on the same computer.

Can anyone tell me what in a CMakeLists.txt file causes CMake to run
this compilation test?

Thanks,
Christian