2005-07-04  Eric Botcazou  <ebotcazou@adacore.com>

	* decl.c (prepend_attributes) <Pragma_Linker_Constructor>: New case.
	<Pragma_Linker_Destructor>: Likewise.

	* einfo.ads (Has_Gigi_Rep_Item): Document Pragma_Linker_Constructor and
	Pragma_Linker_Destructor.

	* gigi.h (attr_type): Add ATTR_LINK_CONSTRUCTOR and
	ATTR_LINK_DESTRUCTOR.
	(static_ctors, static_dtors): New variables.

	* misc.c (gnat_expand_body): Output current function as constructor
	and destructor if requested.

	* par-prag.adb: Add processing for pragma Linker_Constructor and
	Linker_Destructor.

	* sem_prag.adb (Find_Unique_Parameterless_Procedure): New function
	extracted from Check_Interrupt_Or_Attach_Handler.
	(Check_Interrupt_Or_Attach_Handler): Invoke it.
	Implement pragma Linker_Constructor and Linker_Destructor with the
	help of Find_Unique_Parameterless_Procedure.
	Replace Name_Alias with Name_Target for pragma Linker_Alias.

	* snames.h, snames.ads, snames.adb:
	Add Name_Linker_Constructor and Name_Linker_Destructor.
	Add Pragma_Linker_Constructor and Pragma_Linker_Destructor.
	* snames.adb: Remove Name_Alias.

	* trans.c: Include cgraph.h.
	(build_global_cdtor): New function.
	(Compilation_Unit_to_gnu): Build global constructor and destructor if
	needed.
	(tree_transform) <N_Identifier>: Substitute renaming of view-conversions
	of objects too.
	(addressable_p) <COMPONENT_REF>: Unconditionally test
	DECL_NONADDRESSABLE_P on STRICT_ALIGNMENT platforms.

	* utils.c (process_attributes) <ATTR_LINK_ALIAS>: Do not assemble the
	variable if it is external.

	(static_ctors, static_dtors): New global variables.
	(process_attributes) <ATTR_LINK_CONSTRUCTOR>: New case.
	<ATTR_LINK_DESTRUCTOR>: Likewise.
	(end_subprog_body): Chain function as constructor and destructor
	if requested.

	* exp_util.adb (Force_Evaluation): Unconditionally invoke
	Remove_Side_Effects with Variable_Ref set to true.
	(Remove_Side_Effects): Handle scalar types first. Use a renaming
	for non-scalar types even if Variable_Ref is true and for class-wide
	expressions.

From-SVN: r101576