Library Project Files - GNAT User's Guide

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11.15.1.4 Library Project Files

When gnatmake is invoked with a main project file that is a library project file, it is not allowed to specify one or more mains on the command line.

When a library project file is specified, switches -b and -l have special meanings.

-b is only allowed for stand-alone libraries. It indicates to gnatmake that gnatbind should be invoked for the library.
-l may be used for all library projects. It indicates to gnatmake that the binder generated file should be compiled (in the case of a stand-alone library) and that the library should be built.