clean.adb (Check_Project): Look for Ada code in extending project, even if Ada is not specified as a language.

2005-11-14  Vincent Celier  <celier@adacore.com>

	* clean.adb (Check_Project): Look for Ada code in extending project,
	even if Ada is not specified as a language.
	Use new function DLL_Prefix for DLL_Name
	(Clean_Interface_Copy_Directory): New procedure
	(Clean_Library_Directory): New procedure
	(Clean_Directory): Remove procedure, no longer used
	(Clean_Project): Do not delete any file in an externally built project

	* prj-env.adb (Set_Ada_Paths.Add.Recursive_Add): Add the object
	directory of an extending project, even when there are no Ada source
	present.
	(Ada_Objects_Path.Add): Add Library_ALI_Dir, not Library_Dir to the path
	(Set_Ada_Paths.Add.Recursive_Add): Ditto

	* mlib-prj.adb (Check_Library): For all library projects, get the
	library file timestamp.
	(Build_Library): Copy ALI files in Library_ALI_Dir, not in Library_Dir
	(Build_Library): Use new function DLL_Prefix for the DLL_Name
	(Clean): Remove procedure, no longer used
	(Ultimate_Extension_Of): New function
	(Build_Library): When cleaning the library directory, only remove an
	existing library file and any ALI file of a source of the project.
	When cleaning the interface copy directory, remove any source that
	could be a source of the project.

	* prj.ads, prj.adb (Project_Empty): Add values of new components
	Library_TS and All_Imported_Projects.
	(Project_Empty): Add values for new components of Project_Data:
	Library_ALI_Dir and Display_Library_ALI_Dir

	* prj-attr.adb: New project level attribute name Library_ALI_Dir

	* prj-nmsc.adb (Check_Library_Attributes): Take into account new
	attribute Library_ALI_Dir.
	(Check_Library_Attributes): The library directory cannot be the same as
	any source directory of the project tree.
	(Check_Stand_Alone_Library): The interface copy directory cannot be
	the same as any source directory of the project tree.

	* mlib.adb: Use Prj.Com.Fail, instead of Osint.Fail directly, to delete
	all temporary files.

From-SVN: r106967