5.9.2 Qualified Projects

Before the reserved project, there may be one or two `qualifiers', that is identifiers or reserved words, to qualify the project. The current list of qualifiers is:

`abstract':

Qualifies a project with no sources. Such a project must either have no declaration of attributes Source_Dirs, Source_Files, Languages or Source_List_File, or one of Source_Dirs, Source_Files, or Languages must be declared as empty. If it extends another project, the project it extends must also be a qualified abstract project.

`standard':

A standard project is a non library project with sources. This is the default (implicit) qualifier.

`aggregate':

A project whose sources are aggregated from other project files.

`aggregate library':

A library whose sources are aggregated from other project or library project files.

`library':

A library project must declare both attributes Library_Name` and Library_Dir.

`configuration':

A configuration project cannot be in a project tree. It describes compilers and other tools to `gprbuild'.