Can a parent detect what a function has changed with set(... PARENT_SCOPE)?
My use case is that I have multiple layer of function. Previously, func1() simply called func2() but now func1() calls func1_a() which calls func2(). In func1_a() I want to transparently pass everything that func2() changes up to func1().
Note that I cannot make func1_a() simply a macro, it has to be a function. And I using cached/internal variables is also not really an option, as this would expose some internals that should not be exposed actually.
You can use the property VARIABLES to retrieve the list of all variables accessible in the current scope (this includes cache variables). You could store the values of all variables of intereset before calling func2(), then compare their values after the call, and propagate upwards whatever changed. I can’t say I would recommend this solution (and it will have its performance costs), but it is a solution.
Thanks, that would be a technical solution indeed.
I wonder, if I should raise a feature request, that CMake should set a variable that contains the list of modified variables? The other solution would work by cooperation, the called function should provide such a list
I’ve usually had such functions take variable names as parameters rather than using hard-coded variable names (if you can change the inner function signature).