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Main Subprograms

One of the properties of a project is its list of main subprograms (actually a list of names of source files containing main subprograms, with the file extension optional. This property is captured in the Main attribute, whose value is a list of strings. If a project defines the Main attribute, then you do not need to identify the main subprogram(s) when invoking gnatmake (see 10.13.1 gnatmake and Project Files).