cpp-edit-listcpp-edit-list is a variable defined in `
cpp.el'. Its value is
nilDocumentation: Alist of cpp macros and information about how they should be displayed. Each entry is a list with the following elements: 0. The name of the macro (a string). 1. Face used for text that is `ifdef' the macro. 2. Face used for text that is `ifndef' the macro. 3. t, nil, or `both' depending on what text may be edited. You can customize this variable.