(gas-dg-test): Detect invalid values of `do_what'.

diff --git a/gas/testsuite/lib/gas-dg.exp b/gas/testsuite/lib/gas-dg.exp
index ab0741c..031ca34 100644 (file)
--- a/gas/testsuite/lib/gas-dg.exp
+++ b/gas/testsuite/lib/gas-dg.exp
@@ -17,6 +17,10 @@ proc gas-dg-test { prog do_what tool_flags default_tool_flags libs } {
        }
        "run" {
        }
+       default {
+           perror "$do_what: not a valid dg-do keyword"
+           return
+       }
     }
 
     # gas_start prepends $srcdir/$subdir so we must remove it from PROG