CCMake performance regression [MacOS Only]

ccmake for 3.17 looks to have a performance regression on projects that generate lots of output text on MacOS.

Given the following sample CMakeLists.txt, when run under ccmake you can watch the linear slowdown with each subsequent message

project(sample)

foreach(v RANGE 150)
  message(STATUS "${v}")
endforeach()

Benchmark

version	cmake	ccmake
3.16	~3ms	~2sec
3.17	~4ms	~32sec

Edited Apr 06, 2020 by Robert Maynard

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