PATCH 1/3: Fix handling of blank lines in testsuite/runtest.libs/libs.exp

[Jacob Bachmeyer]

Previously, Expect could hang if the child process running tests emitted 
a blank line, or if an end-of-line sequence was split (this latter 
circumstance is very rare and I have not directly observed it -- only an 
unreproducible hang, once, that I now believe to have been caused by 
this bug), causing all subsequent output to pile up in Expect's buffer 
unrecognized.

----
ChangeLog entry:
        * testsuite/runtest.libs/libs.exp (process_test): Handle blank
        lines from child process correctly.
---
testsuite/runtest.libs/libs.exp |    1 +
1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/testsuite/runtest.libs/libs.exp b/testsuite/runtest.libs/libs.exp
index 80b46ab..8521ead 100644
--- a/testsuite/runtest.libs/libs.exp
+++ b/testsuite/runtest.libs/libs.exp
@@ -44,6 +44,7 @@ proc process_test { test } {
            "no such file or directory" {
                perror "$test wouldn't run" 0
            }
+           -re {^[\r\n]+} { exp_continue }
            -re "^\[^\r\n\]*NOTSUPPORTED: $text\[\r\n\]*" {
                unsupported "[lrange $expect_out(0,string) 1 end]"
                exp_continue
----


-- Jacob