2015-10-23  Hristian Kirtchev  <kirtchev@adacore.com>

	* contracts.ads, contracts.adb: New unit.
	* exp_ch6.adb Add with and use clauses for Contracts.
	(Expand_Subprogram_Contract): Moved to Contracts.
	* exp_ch6.ads (Expand_Subprogram_Contract): Moved to Contracts.
	* sem_ch3.adb Add with and use clauses for Contracts.
	(Analyze_Object_Contract): Moved to Contracts.
	(Analyze_Declarations): Remove local variable Pack_Decl. Do not
	capture global references in contracts. Check the hidden states
	of a package body.
	* sem_ch6.adb Add with and use clauses in Contracts.
	(Analyze_Generic_Subprogram_Body): Do not capture global
	references in contracts.
	(Analyze_Subprogram_Body_Contract):
	Moved to Contracts.
	(Analyze_Subprogram_Body_Helper): Freeze the
	contract of the nearest enclosing package body. Always analyze
	the subprogram body contract. Do not expand the subprogram
	body contract.
	(Analyze_Subprogram_Contract): Moved to Contracts.
	* sem_ch6.ads (Analyze_Subprogram_Body_Contract): Moved to Contracts.
	(Analyze_Subprogram_Contract): Moved to Contracts.
	* sem_ch7.adb Add with and use clauses for Contracts.
	(Analyze_Package_Body_Contract): Moved to Contracts.
	(Analyze_Package_Body_Helper): Freeze the contract of the
	nearest enclosing package body.
	(Analyze_Package_Contract): Moved to Contracts.
	* sem_ch7.ads (Analyze_Package_Body_Contract): Moved to Contracts.
	(Analyze_Package_Contract): Moved to Contracts.
	* sem_ch10.adb Add with and use clauses for Contracts.
	(Analyze_Compilation_Unit): Do not capture global references
	in contracts.
	(Analyze_Subprogram_Body_Stub_Contract): Moved to Contracts.
	* sem_ch10.ads (Analyze_Subprogram_Body_Stub_Contract): Moved
	to Contracts.
	* sem_ch12.adb Add with and use clauses for Contracts.
	(Analyze_Subprogram_Instantiation): Update the call to
	Instantiate_Subprogram_Contract.
	(Instantiate_Package_Body):
	Do not copy the entity of the spec when creating an entity
	for the body. Construct a brand new defining identifier for
	the body and inherit the Comes_From_Source flag from the spec.
	(Instantiate_Subprogram_Body): Remove Anon_Id to Act_Decl_Id
	and update all occurrences. Construct a brand new defining
	identifier for the body and inherit the Comes_From_Source
	flag from the spec.
	(Instantiate_Subprogram_Contract): Moved
	to Contracts.
	(Save_Global_References_In_Aspects): Moved to
	the spec of Sem_Ch12.
	(Save_Global_References_In_Contract):
	Moved to Contracts.
	* sem_ch12.ads (Save_Global_References_In_Aspects): Moved from
	the body of Sem_Ch12.
	(Save_Global_References_In_Contract):
	Moved to Contracts.
	* sem_prag.adb Add with and use clauses for Contracts.
	(Add_Item): Removed. All references to this routine have been
	replaced with calls to Append_New_Elmt.
	(Analyze_Constituent):
	Add special diagnostics for errors caused by freezing of
	contracts.
	(Analyze_Refined_State_In_Decl_Part): Add formal
	parameter Freeze_Id. Add new global variable Freeze_Posted.
	(Collect_Body_States): Removed.
	(Report_Unused_States): Removed.
	* sem_prag.ads (Analyze_Defined_State_In_Decl_Part): Add formal
	parameter Freeze_Id and update comment on usage.
	* sem_util.adb Remove with and use clauses for
	Sem_Ch12.
	(Add_Contract_Item): Moved to Contracts.
	(Check_Unused_Body_States): New routine.
	(Collect_Body_States):
	New routine.
	(Create_Generic_Contract): Moved to Contracts.
	(Inherit_Subprogram_Contract): Moved to Contracts.
	(Report_Unused_Body_States): New routine.
	* sem_util.ads (Add_Contract_Item): Moved to Contracts.
	(Check_Unused_Body_States): New routine.
	(Collect_Body_States): New routine.
	(Create_Generic_Contract): Moved to Contracts.
	(Inherit_Subprogram_Contract): Moved to Contracts.
	(Report_Unused_Body_States): New routine.
	* sinfo.adb (Is_Expanded_Contract): New routine.
	(Set_Is_Expanded_Contract): New routine.
	* sinfo.ads New attribute Is_Expanded_Contract along with
	placement in nodes.
	(Is_Expanded_Contract): New routine along
	with pragma Inline.
	(Set_Is_Expanded_Contract): New routine
	along with pragma Inline.
	* gcc-interface/Make-lang.in: Add entry for contracts.o

2015-10-23  Bob Duff  <duff@adacore.com>

	* bindgen.adb, init.c, opt.ads, switch-b.adb: Implement new -Ea and
	-Es switches.
	* switch-b.ads: Minor comment fix.
	* bindusg.adb: Document new -Ea and -Es switches.
	* s-exctra.ads: Use -Es instead of -E.

From-SVN: r229253