re PR ada/20300 (ICE on undefined value of type derived from Character)

2005-03-29  Gary Dismukes  <dismukes@adacore.com>
	    Robert Dewar  <dewar@adacore.com>

	* exp_intr.adb (Expand_Dispatching_Constructor_Call): New procedure to
	expand a call to an instance of
	Ada.Tags.Generic_Dispatching_Constructor into a dispatching call to the
	Constructor actual of the instance. A class-wide membership
	check is also generated, to ensure that the tag passed to the instance
	denotes a type in the class.
	(Expand_Intrinsic_Call): Call Expand_Dispatching_Constructor in the case
	of Name_Generic_Dispatching_Constructor.

	* Makefile.rtl: Add a-tgdico.ads to the list of library units (new Ada
	05 unit for AI-260-02).

	* a-tgdico.ads: New file.

	* impunit.adb (Non_Imp_File_Names_05): Add entry "a-tgdico" for new
	predefined Ada 05 generic unit Ada.Tags.Generic_Dispatching_Constructor.

	* snames.ads, snames.adb (Preset_Names): Add entry for
	Generic_Dispatching_Constructor.

	PR ada/20300

	* sem_ch8.adb (Find_Direct_Name): Go to root type for check of
	character type cases.
	(Analyze_Subprogram_Renaming): Add special handling for
	the case of renaming of stream attributes when the renaming denotes a
	generic formal subprogram association for an abstract formal subprogram.
	Check that the attribute is a primitive stream attribute (and not
	a class-wide stream attribute) and then rewrite the attribute name
	as the name of the appropriate compiler-generated stream primitive.

From-SVN: r97172