(Switches_Of): New function
	(Test_If_Relative_Path): New procedure
	(Add_Switches): Use new function Switches_Of
	(Collect_Arguments_And_Compile): Use new function Switches_Of.
	When using a project file, test if there are any relative
	search path. Fail if there are any.
	(Gnatmake): Only add switches for the primary directory when not using
	a project file. When using a project file, change directory to the
	object directory of the main project file. When using a project file,
	test if there are any relative search path. Fail if there are any.
	When using a project file, fail if specified executable is relative
	path with directory information, and prepend executable, if not
	specified as an absolute path, with the exec directory.  Make sure
	that only one -o switch is transmitted to the linker.

	* prj-attr.adb (Initialization_Data): Add project attribute Exec_Dir

	* prj-nmsc.adb:
	(Ada_Check): Get Spec_Suffix_Loc and Impl_Suffix_Loc,
	when using a non standard naming scheme.
	(Check_Ada_Naming_Scheme): Make sure that error messages
	do not raise exceptions.
	(Is_Illegal_Append): Return True if there is no dot in the suffix.
	(Language_Independent_Check): Check the exec directory.

	* prj.adb (Project_Empty): Add new component Exec_Directory

	* prj.ads:
	(Default_Ada_Spec_Suffix, Default_Ada_Impl_Suffix): Add defaults.
	(Project_Data): Add component Exec_Directory

	* snames.adb: Updated to match snames.ads revision 1.215

	* snames.ads: Added Exec_Dir

	* make.adb: Minor reformatting

	* prj-nmsc.adb: Minor reformatting

	* snames.adb: Updated to match snames.ads

	* snames.ads: Alphebetize entries for project file

	* trans.c (process_freeze_entity): Do nothing if the entity is a
	subprogram that was already elaborated.

	* decl.c (gnat_to_gnu_entity, object): Do not back-annotate Alignment
	and Esize if object is referenced via pointer.

From-SVN: r48127