Genex: Fix evaluation context propagation for TARGET_OBJECTS.
Extract a new method to encapsulate the requirements of evaluating dependent-expressions, namely, propagation of the EvaluateForBuildsystem setting, which is missing from the getLinkedTargetsContent implementation. Commit v3.1.0-rc1~688^2 (Genex: Only evaluate TARGET_OBJECTS to determine target sources., 2014-03-20) introduced an error case for use of TARGET_OBJECTS outside of the context of generating the buildsystem, as the path to object files may be dependent on buildsystem variables (See bug #15226). Commit v3.1.0-rc1~314^2 (Allow INTERFACE_SOURCES to specify $<TARGET_OBJECTS> (#14970), 2014-07-09) made it possible to propagate such content to dependent targets. While that commit propagated the EvaluateForBuildsystem setting for the case of a TARGET_PROPERTY expression, as generated for direct dependencies of a target in cmTargetInternals::AddInterfaceEntries, it did not add propagation for content from further transitive target dependencies, as determined by getLinkedTargetsContent.
Showing with 44 additions and 35 deletions