[gdb/testsuite] Check for valid test name

When running gdb.base/batch-exit-status.exp I noticed that the test name
contains a newline:
...
PASS: gdb.base/batch-exit-status.exp: : No such file or directory\.^M
: No such file or directory\.: [lindex $result 2] == 0
...

Check for this in ::CheckTestNames::check, such that we have a warning:
...
PASS: gdb.base/batch-exit-status.exp: : No such file or directory\.^M
: No such file or directory\.: [lindex $result 2] == 0
WARNING: Newline in test name
...

Tested on x86_64-linux.

1 files changed, 9 insertions, 0 deletions

diff --git a/gdb/testsuite/lib/check-test-names.exp b/gdb/testsuite/lib/check-test-names.exp
index 1de7624..e2ac5bd 100644
--- a/gdb/testsuite/lib/check-test-names.exp
+++ b/gdb/testsuite/lib/check-test-names.exp
@@ -93,6 +93,13 @@ namespace eval ::CheckTestNames {
 	return $message
     }
 
+    # Check if MESSAGE is a well-formed test name.
+    proc _check_well_formed_name { message } {
+	if { [regexp \n $message]} {
+	    warning "Newline in test name"
+	}
+    }
+
     # Check if MESSAGE contains either the source path or the build path.
     # This will result in test names that can't easily be compared between
     # different runs of GDB.
@@ -110,6 +117,8 @@ namespace eval ::CheckTestNames {
 	if [ _check_duplicates $message ] {
 	    clone_output "DUPLICATE: $message"
 	}
+
+	_check_well_formed_name $message
     }
 
     # If COUNT is greater than zero, disply PREFIX followed by COUNT.