Building Larger Packages

For packages that span multiple files, the main module is designated by the module that shares the name with the package directory and the name field in the Mason.toml file.

While not recommended with mason libraries that are going to be added to the mason registry, passing a -- -M as outlined below can make building your mason application easier, but, for mason libraries, submodules should be used to avoid conflicting namespaces for users of your library (see Including Sub-Modules from Separate Files).

For packages that span multiple sub-directories within src, sub-directories must be passed to mason with the -- -M  <src/subdirectory> flag. Note the -- which tells mason to forward all remaining flags directly to the chapel compiler. For example, lets say MyPackage’s structure is as follows:

 ├── Mason.lock
 ├── Mason.toml
 ├── example/
 ├── src/
 │   ├── myPackage.chpl
 │   └── util/
 │       └── myPackageUtils.chpl
 ├── target/
 │   ├── debug/
 │   │   └── myPackage
 │   ├── example/
 │   └── test/
 └── test/

If MyPackage needs multiple files in different directories like the example above, then call mason build with the -- -M flag followed by the local dependencies. A full command of this example would be:

mason build -- -M src/util/MyPackageUtils.chpl