[Ada] Project tree clean ups

[Arnaud Charlet <charlet at adacore dot com>]

Tested on x86-linux, committed on mainline.

[patch zipped, since rejected by the mail server otherwise]

These updates to the project tree are preparatory work for the
full support of multi-language system. They don't modify the behavior
of the Project Manager.

In addition, gnatls -v which is used throughout the toolchain
to interrogate the current compiler of its various path information currently
only provides source path, object path. This change enriches the
output with the project path information.

2004-12-07  Vincent Celier  <celier@adacore.com>

	* make.adb (Check_Mains, Switches_Of): Adapt to name changes in
	package Prj (Current_Spec_Suffix => Ada_Spec_Suffix,
	Current_Body_Suffix => Ada_Body_Suffix).
	Take into account Externally_Built attribute.

	* clean.adb (In_Extension_Chain): Always return False when one of the
	parameter is No_Project.
	(Clean_Project): Adapt to changes in package Prj (Lang_Ada =>
	Ada_Language_Index).
	(Gnatclean): Adapt to change in package Prj.Pars (no parameter
	Process_Languages for procedure Parse).

	* gnatcmd.adb (Carg_Switches): New table.
	(GNATCmd): Put all switches following -cargs in the Carg_Switches table.
	Adapt to name changes in package Prj (Current_Spec_Suffix =>
	Ada_Spec_Suffix, Current_Body_Suffix => Ada_Body_Suffix).

	* mlib-prj.adb: Adapt to changes in packages Prj and Prj.Com: type
	Header_Num and function Hash are now declared in package Prj,
	not Prj.Com.

	* prj.adb (Suffix_Of): New function.
	(Set (Suffix)): New procedure.
	(Hash): One function moved from Prj.Com
	(Is_Present, Language_Processing_Data_Of): New functions
	(Set): Two new procedures
	(Add_Language_Name, Display_Language_Name): New procedures

	* prj.ads: (Suffix_Of): New function
	(Set (Suffix)): New procedure
	Add several types and tables for multi-language support.
	(Header_Num): Type moved from Prj.Com
	(Hash): Two functions moved from Prj.Com
	(Is_Present, Language_Processing_Data_Of): New functions
	(Set): Two new procedures
	(Add_Language_Name, Display_Language_Name): New procedures
	(Naming): Component name changes:
	Current_Spec_Suffix => Ada_Spec_Suffix,
	Current_Body_Suffix => Ada_Body_Suffix. Add new components:
	Impl_Suffixes, Supp_Suffixes.
	(Project_Data): New components: Externally_Built, Supp_Languages,
	First_Language_Processing, Supp_Language_Processing, Default_Linker,
	Default_Linker_Path.

	* prj-attr.adb: Add new attributes Ada_Roots and Externally_Built and
	new package Language_Processing with its attributes (Compiler_Driver,
	Compiler_Kind, Dependency_Option, Compute_Dependency, Include_Option,
	Binder_Driver, Default_Linker).

	* prj-com.ads, prj-com.adb (Hash): Function moved to package Prj.
	(Header_Num): Type moved to package Prj

	* prj-env.adb: Adapt to name changes in package Prj
	(Current_Spec_Suffix => Ada_Spec_Suffix,
	Current_Body_Suffix => Ada_Body_Suffix).

	* prj-ext.adb: Add the default project dir (<prefix>/log/gnat) by
	default to the project path, except the "-" is one of the directories
	in env var ADA_PROJECT_PATH.
	(Current_Project_Path): Global variable, replacing Project_Path
	that was in the body of Prj.Part.
	(Project_Path): New function
	(Set_Project_Path): New procedure
	Initialize Current_Project_Path during elaboration of the package
	Remove dependency on Prj.Com, no longer needed

	* prj-ext.ads (Project_Path): New function
	(Set_Project_Path): New procedure

	* prj-nmsc.adb (Body_Suffix_Of): New function. Returns .<lang> when no
	suffix is defined for language <lang>.
	(Find_Sources, Record_Other_Sources): Use Body_Suffix_Of, instead of
	accessing directly the components of Naming.
	(Look_For_Sources): Use Set (Suffix) to set the suffix of a language.
	Reorganise of this package.
	Break procedure Check in several procedures.

	* prj-nmsc.ads: Replace all procedures (Ada_Check,
	Other_Languages_Check and Language_Independent_Check) with a single
	procedure Check.

	* prj-pars.ads, prj-pars.adb (Parse): Remove parameter
	Process_Languages, no longer needed.

	* prj-part.adb (Project_Path): Move to the body of Prj.Ext as
	Current_Project_Path.
	Remove elaboration code, moved to the body of Prj.Ext
	Use new function Prj.Ext.Project_Path instead of old variable
	Project_Path.
	(Post_Parse_Context_Clause): Get Resolved_Path as a case-sensitive path.
	When comparing with project paths on the stack, first put the resolved
	path in canonical case.
	(Parse_Single_Project): Set the path name of the project file in the
	tree to the normalized path.

	* prj-proc.ads, prj-proc.adb (Check, Recursive_Check, Process): Remove
	parameter Process_Languages, no longer needed.
	(Recursive_Check): Call Prj.Nmsc.Check, instead of Ada_Check and
	Other_Languages_Check.

	* prj-tree.ads (Project_Name_And_Node): New component Canonical_Path
	to store the resolved canonical path of the project file.
	Remove dependency to Prj.Com, no longer needed

	* prj-util.adb: Adapt to name changes in package Prj
	(Current_Spec_Suffix => Ada_Spec_Suffix, Current_Body_Suffix =>
	Ada_Body_Suffix).

	* snames.ads, snames.adb: New standard names: Ada_Roots, Binder_Driver,
	Compiler_Driver, Compiler_Kind, Compute_Dependency, Default_Linker,
	Externally_Built, Include_Option, Language_Processing.

	* makegpr.adb: Numerous changes due to changes in packages
	Prj and Prj.Nmsc.

	* gnatls.adb: Add the default project dir (<prefix>/log/gnat) by
	default to the project path, except whe "-" is one of the directories
	in env var ADA_PROJECT_PATH.
	(Gnatls): In verbose mode, add the new section "Project Search Path:"

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