Querying and Transforming

Many generator expressions are available, but to avoid getting lost in the weeds, let’s focus on the most common ones. We’ll start with some basic transformations of the available data.

Dealing with strings, lists and paths

Generator expressions provide only the bare minimum of operations to transform and query data structures. Working with strings in the generator stage is possible with the following expressions:

• $<LOWER_CASE:string>, $<UPPER_CASE:string> – converts string to the required case.

List operations were fairly limited until recently. Since CMake 3.15, the following operations were available:

• $<IN_LIST:string,list> – returns true if list contains a string value
• $<JOIN:list,d> – joins a semicolon-separated list using a d delimiter.
• $<REMOVE_DUPLICATES:list> – deduplicates list (without sorting).
• $<FILTER:list,INCLUDE|EXCLUDE,regex> – includes/excludes items from...