libstdc++v3: Explicitly disable carets and colorization within testsuite

libstdc++-v3/ChangeLog:
	* testsuite/lib/libstdc++.exp (v3_target_compile): Add
	-fno-diagnostics-show-caret -fdiagnostics-color=never to
	option's additional_flags.

From-SVN: r229876

libstdc++-v3/ChangeLog

+2015-11-06  David Malcolm  <dmalcolm@redhat.com>
+
+	* testsuite/lib/libstdc++.exp (v3_target_compile): Add
+	-fno-diagnostics-show-caret -fdiagnostics-color=never to
+	option's additional_flags.
+
 2015-11-03  Jason Merrill  <jason@redhat.com>
 
 	* libsupc++/new: Declare sized deletes.

libstdc++-v3/testsuite/lib/libstdc++.exp

@@ -467,6 +467,8 @@ proc v3_target_compile { source dest type options } {
     global STATIC_LIBCXXFLAGS
     global tool
 
+    lappend options "additional_flags=-fno-diagnostics-show-caret -fdiagnostics-color=never"
+
     if { [target_info needs_status_wrapper] != "" && [info exists gluefile] } {
         lappend options "libs=${gluefile}"
         lappend options "ldflags=${wrap_flags}"