gdb/ * dwarf2expr.c (read_sleb128): Fix signed extension overflowing host `int'. gdb/testsuite/ * gdb.dwarf2/dw2-const.S (Pointer size): Change from 4 to 8. (DW_AT_high_pc, DW_AT_low_pc): Remove them. (val8, .Ltype_const8, .Ltype_int8, DW_TAG_variable): New. * gdb.dwarf2/dw2-const.exp (print/x val8): New test.