2007-08-14 Ed Schonberg <schonberg@adacore.com>

2007-08-14  Ed Schonberg  <schonberg@adacore.com>
	    Gary Dismukes  <dismukes@adacore.com>
	    Thomas Quinot  <quinot@adacore.com>

	* sem_ch12.ads, sem_ch12.adb (Instantiate_Type): If the formal is a
	derived type with interface progenitors use the analyzed formal as the
	parent of the actual, to create renamings for all the inherited
	operations in Derive_Subprograms.
	(Collect_Previous_Instances): new procedure within of
	Load_Parent_Of_Generic, to instantiate all bodies in the compilation
	unit being loaded, to ensure that the generation of global symbols is
	consistent in different compilation modes.
	(Is_Tagged_Ancestor): New function testing the ancestor relation that
	takes progenitor types into account.
	(Validate_Derived_Type_Instance): Enforce the rule of 3.9.3(9) by
	traversing over the primitives of the formal and actual types to locate
	any abstract subprograms of the actual type that correspond to a
	nonabstract subprogram of the formal type's ancestor type(s), and issue
	an error if such is found.
	(Analyze_Package_Instantiation, Analyze_Subprogram_Instantiation,
	Instantiate_Package_Body, Instantiate_Subprogram_Body):
	Remove bogus guard around calls to Inherit_Context.
	(Reset_Entity): If the entity is the selector of a selected component
	that denotes a named number, propagate constant-folding to the generic
	template only if the named number is global to the generic unit.
	(Set_Instance_Env): Only reset the compilation switches when compiling
	a predefined or internal unit.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@127443 138bc75d-0d04-0410-961f-82ee72b054a4