* lib/gcc-defs.exp (additional_sources): New variable.
	(dg-additional-sources): New function.
	(additional_files): New variable.
	(dg-additional-files): New function.
	(dg-additional-files-options): Likewise.
	* lib/gcc-dg.exp (dg-require-weak): New function.
	(dg-require-alias): Likewise.
	(dg-require-gc-sections): Likewise.
	* lib/target-supports.exp (check_alias_available): Remove testfile
	parameter.
	(check_gc_sections_available): New function.
	* lib/g++-dg.exp (dg-gpp-additional-sources): Remove.
	(dg-gpp-additional-files): Likewise.
	* lib/g++.exp (additional_sources): Remove.
	(additional_files): Likewise.
	(g++_target_compile): Use dg-additional-files-options.

	* gcc.dg/special/special.exp: Add "ecos" tests.  Remove complex
	Tcl logic.
	* gcc.dg/special/ecos.exp: Remove.
	* gcc.dg/special/20000419-2.c: Use dg-require-*.
	* gcc.dg/special/alias-1.c: Likewise.
	* gcc.dg/special/alias-2.c: Likewise.
	* gcc.dg/special/gcsec-1.c: Likewise.
	* gcc.dg/special/weak-1.c: Likewise.
	* gcc.dg/special/weak-2.c: Likewise.
	* gcc.dg/special/wkali-1.c: Likewise.
	* gcc.dg/special/wkali-2.c: Likewise.

	* g++.dg/special/conpr-2.C: Use dg-additional-*, not
	dg-gpp-additional-*.
	* g++.dg/special/conpr-3.C: Likewise.
	* g++.dg/special/conpr-4.C: Likewise.
	* g++.old-deja/g++.abi/vtable3a.C: Likewise.
	* g++.old-deja/g++.abi/vtable3b.C: Likewise.
	* g++.old-deja/g++.abi/vtable3c.C: Likewise.
	* g++.old-deja/g++.abi/vtable3d.C: Likewise.
	* g++.old-deja/g++.abi/vtable3e.C: Likewise.
	* g++.old-deja/g++.abi/vtable3f.C: Likewise.
	* g++.old-deja/g++.abi/vtable3g.C: Likewise.
	* g++.old-deja/g++.abi/vtable3h.C: Likewise.
	* g++.old-deja/g++.abi/vtable3i.C: Likewise.
	* g++.old-deja/g++.abi/vtable3j.C: Likewise.
	* g++.old-deja/g++.oliva/linkage1.C: Likewise.
	* g++.old-deja/g++.other/comdat1.C: Likewise.
	* g++.old-deja/g++.other/comdat2.C: Likewise.
	* g++.old-deja/g++.other/comdat3.C: Likewise.
	* g++.old-deja/g++.other/ctor1.C: Likewise.
	* g++.old-deja/g++.pt/instantiate5.C: Likewise.

From-SVN: r67514