* testsuite/lib/libstdc++.exp (check_v3_target_time): Discard
unused compilation result thanks to /dev/null.
- * testsuite/lib/libstdc++.exp (check_v3_target_debug_mode
- check_v3_target_profile_mode check_v3_target_normal_mode
- check_v3_target_cstdint check_v3_target_cmath
- check_v3_target_atomic_builtins check_v3_target_gthreads
- check_v3_target_nanosleep check_v3_target_sched_yield
- check_v3_target_string_conversions check_v3_target_swprintf
+ * testsuite/lib/libstdc++.exp (check_v3_target_debug_mode,
+ check_v3_target_profile_mode, check_v3_target_normal_mode,
+ check_v3_target_cstdint, check_v3_target_cmath,
+ check_v3_target_atomic_builtins, check_v3_target_gthreads,
+ check_v3_target_nanosleep, check_v3_target_sched_yield,
+ check_v3_target_string_conversions, check_v3_target_swprintf,
check_v3_target_binary_io): Use simple preprocessing rather than
compilation. Discard unused preprocessing result thanks to /dev/null.