* boards/dwarf4-gdb-index.exp: Use any existing CC_FOR_TARGET,
	CXX_FOR_TARGET.
	* cp-abi.c (cp_abi_completer): Fix typo in assignment.
gdb/
	* symtab.c (compare_filenames_for_search): New comment for
	HAS_DRIVE_SPEC.

gdb/testsuite/
	* gdb.dwarf2/dw2-dos-drive.S: New file.
	* gdb.dwarf2/dw2-dos-drive.exp: New file.