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In https://sourceware.org/ml/gdb-patches/2017-12/msg00215.html, Jan pointed out that the scalar printing patches caused a regression in scm-ports.exp on x86. What happens is that on x86, this: set sp_reg [get_integer_valueof "\$sp" 0] ... ends up setting sp_reg to a negative value, because get_integer_valueof uses "print/d": print /d $sp $1 = -11496 Then later the test suite does: gdb_test "guile (print (seek rw-mem-port (value->integer sp-reg) SEEK_SET))" \ "= $sp_reg" \ "seek to \$sp" ... expecting this value to be identical to the saved $sp_reg value. However it gets: guile (print (seek rw-mem-port (value->integer sp-reg) SEEK_SET)) = 4294955800 "print" is just a wrapper for guile's format: gdb_test_no_output "guile (define (print x) (format #t \"= ~A\" x) (newline))" The seek function returns a scm_t_off, the printing of which is handled by guile, not by gdb. Tested on x86-64 Fedora 26 using an ordinary build and also a -m32 build. 2018-01-15 Tom Tromey <tom@tromey.com> * gdb.guile/scm-ports.exp (test_mem_port_rw): Use get_valueof to compute sp_reg.