cmGeneratorExpressionEvaluator: Short-circuit boolean operators (!8791) · Merge requests · CMake / CMake

Short-circuit evaluation of IF, AND and OR generator expressions.

This reduces confusion and verbosity of some generator expression logic.

# Before
$<IF:$<IS_TARGET:${x}>,$<$<IS_TARGET:${x}>:$<TARGET_FILE:${x}>>,NO-TARGET>

# After
$<IF:$<IS_TARGET:${x}>,$<TARGET_FILE:${x}>,NO-TARGET>

The old behavior with the After example gives the following error when set(x test):

Error evaluating generator expression:
   $<TARGET_FILE:test>
No target "test"

cmGeneratorExpressionEvaluator: Short-circuit boolean operators