gcc-dg.exp: Increase expect's match buffer size.

2017-07-17  Bernd Edlinger  <bernd.edlinger@hotmail.de>

        * lib/gcc-dg.exp: Increase expect's match buffer size.

From-SVN: r250279

gcc/testsuite/ChangeLog

+2017-07-17  Bernd Edlinger  <bernd.edlinger@hotmail.de>
+
+	* lib/gcc-dg.exp: Increase expect's match buffer size.
+
 2017-07-17  Bin Cheng  <bin.cheng@arm.com>
 
 	PR target/81369

gcc/testsuite/lib/gcc-dg.exp

@@ -43,6 +43,9 @@ if { [ishost "*-*-cygwin*"] } {
   setenv LANG C.ASCII
 }
 
+# Avoid sporadic data-losses with expect
+match_max -d 10000
+
 # Ensure GCC_COLORS is unset, for the rare testcases that verify
 # how output is colorized.
 if [info exists ::env(GCC_COLORS) ] {