CMakeLists.txt using $<IF:...> syntax when not supported by that version of CMake #1892
Description
Example of a broken build when using CMake 3.7:
https://source.cloud.google.com/results/invocations/c18bbd62-5117-4837-8aaa-5665b8e1b3ee/log
Excerpt:
-- Google Mock found - building tests
-- Configuring done
CMake Error:
Error evaluating generator expression:
$<IF:$<CONFIG:Debug>,gmockd,gmock>
Expression did not evaluate to a known generator expression
CMake Error:
Error evaluating generator expression:
$<IF:$<CONFIG:Debug>,gmock_maind,gmock_main>
Expression did not evaluate to a known generator expression
The $IF:... syntax was introduced in CMake 3.8.
Insteda of $IF:expr,A,B we can use