Question

In a project, there are many libraries:

• there are dependencies between libraries.
• each library has some features to enable/disable at build time.
• one library feature may depends on another library’s specified feature.

Problem:

1. How to use cmake to organize such feature based dependency.
2. How to configure different target with different feature list.

Answer 1

Use option() and set() with CACHE keyword commands to define build options.

Use if(OPTION_NAME) to test for option value. Use add_dependencies() inside if block to make some of them optional.

Use configure_file() to replace template file (config headerm for example) with options’ values.