In the `BUCK` file, any difference between these two options:
Julio C. Villasante

glob is used to generate a list of all files that match the pattern from the BUCK file.

subdir_glob is used to generate a dictionary. The values are the path to each file from the BUCK file. The keys are the path to each file from the left-hand-side of the pair. You can think of subdir_glob like a cd followed by a glob.

For example:

└── my-library
├── BUCK
├── include
│ └── detail
│ └── a.hpp
│ └── b.hpp
├── private
│ └── c.hpp
└── src
└── a.cpp

The following…

('include', '**/*.hpp'),

Would give…

'detail/a.hpp': 'include/detail/a.hpp',
'b.hpp': 'include/b.hpp'

You can add a print to your BUCK file for debugging.

headers and exported_headers can accept a list or a dictionary. I prefer the dictionary approach because #include <library/header.hpp> is much cleaner than #include <library/include/header.hpp>.

To get Clang completion working in your example, you need to add mathutils/include to the include path. It would definitely be possible to build tooling that reads the Buck targets for code-completion automatically!

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