* a-except.adb (Zero_Cost_Exceptions): Removed, no longer used.
	(builtin_longjmp, Process_Raise_Exceeption): Move setjmp/longjmp
	related code to a-exexpr.adb
	(Save_Occurrence_And_Private): Move GCC EH related code to
	a-exexpr-gcc.adb
	(Raise_Current_Excep): Add new variable Id with pragma
        volatile, to ensure that the variable lives on stack.

	* a-exexpr-gcc.adb, raise-gcc.c: New file.

	* a-exexpr.adb (builtin_longjmp, Propagate_Exception): Moved here code
	from a-except.adb.
	Move GCC EH related code to a-exexpr-gcc.adb

	* Makefile.in: Add or update g-soccon LIBGNAT pairs for Linux/PPC and
	64-bit Solaris
	Split the Linux version of g-soccon into separate variants for 32 and 64
	bit platforms.
	(gnatlib): Use $(AR_FOR_TARGET) and $(RANLIB_FOR_TARGET)
	vice $(AR) and $(RANLIB). Remove use of host variable $(RANLIB_FLAGS).
	install-gnatlib: Use $(RANLIB_FOR_TARGET) vice $(RANLIB). Remove use
	of host variable $(RANLIB_FLAGS).
	(alpha64-dec-*vms*): Fix translations for 64 bit compiler.
	Code clean up: remove unused/obsolete targets.
	(EH_MECHANISM): New variable introduced to differenciate between the
	two EH mechanisms statically.
	(gnatlib-zcx, gnatlib-sjlj): Force EH_MECHANISM manually.
	(LIBGNAT_OBJS): Add raise-gcc.o
	(LIBGNAT_TARGET_PAIRS for ppc-vxworks): Use an specialized version of
	s-osinte.adb, s-tpopsp.adb, and system.ads for the run time that
	supports VxWorks 6 RTPs.
	(EXTRA_GNATRTL_NONTASKING_OBJS for ppc-vxworks): Remove the use of
	i-vxworks and i-vxwoio from the run time that supports VxWorks 6 RTPs.

	* raise.c: Move all GCC EH-related routines to raise-gcc.c

From-SVN: r106959