This works well for our code base especially since we use name based prefixes to ensure uniqueness of symbols we use for defensive includes across code base:

In our base the convention that makes sense is something like this:

• For COLstring.h

• Use COL_STRING_H

  • Basically <prefix>_WORD1_WORD2…_H

The key thing is that if the header file name changes we have to change the defensive include symbol.