[PATCH] Testsuite: Fix racy conditions in py-cmd.exp

[Alan Hayward <alan dot hayward at arm dot com>]

The test loop in test_python_inline_or_multiline was not checking for the
gdb prompt. readline_is_used then reads in the prompt causing it to fail
and the final chunk of tests to be skipped.

Spotted this error becuase sometimes the gdb prompt does get processed
correctly and the final tests are run, causing it to show up in the
racy tests script output.

Fix by ensuring the prompt is always checked for. To do this the list
style needs reformatting so that variables get expanded.

gdb/testsuite/ChangeLog:

2018-10-12  Alan Hayward  <alan.hayward@arm.com>

	* gdb.python/py-cmd.exp: Check for gdb_prompt.
---
 gdb/testsuite/gdb.python/py-cmd.exp | 71 +++++++++++++++--------------
 1 file changed, 36 insertions(+), 35 deletions(-)

diff --git a/gdb/testsuite/gdb.python/py-cmd.exp b/gdb/testsuite/gdb.python/py-cmd.exp
index d2d8205446..33a5b39842 100644
--- a/gdb/testsuite/gdb.python/py-cmd.exp
+++ b/gdb/testsuite/gdb.python/py-cmd.exp
@@ -188,44 +188,45 @@ gdb_test "complete expr_test bar\." \
 # the easiest way is just to test with Python.
 proc test_python_inline_or_multiline { } {
     global gdb_prompt
+    set end "\r\n$gdb_prompt $"
 
-    set define_cmd_not_inline {
-	{ "if 1"                 " >$"            "multi-line if 1" }
-	{ "python"               " >$"            "multi-line python command" }
-	{ "print ('hello')"      "  >$"           "multi-line print" }
-	{ "end"                  " >$"            "multi-line first end" }
-	{ "end"                  "hello\r\n"      "multi-line last end" } }
+    set define_cmd_not_inline [ list \
+	[ list "if 1"                 " >$"            "multi-line if 1" ] \
+	[ list "python"               " >$"            "multi-line python command" ] \
+	[ list "print ('hello')"      "  >$"           "multi-line print" ] \
+	[ list "end"                  " >$"            "multi-line first end" ] \
+	[ list "end"                  "hello$end"      "multi-line last end" ] ]
 
     # This also tests trailing whitespace on the command.
-    set define_cmd_alias_not_inline {
-	{ "if 1"                 " >$"            "multi-line if 1 alias" }
-	{ "py    "               " >$"            "multi-line python command alias" }
-	{ "print ('hello')"      "  >$"           "multi-line print alias" }
-	{ "end"                  " >$"            "multi-line first end alias" }
-	{ "end"                  "hello\r\n"      "multi-line last end alias" } }
-
-    set define_cmd_alias_foo_not_inline {
-	{ "alias foo=python"     "\r\n"           "multi-line alias foo" }
-	{ "if 1"                 " >$"            "multi-line if 1 alias foo" }
-	{ "foo    "              " >$"            "multi-line python command alias foo" }
-	{ "print ('hello')"      "  >$"           "multi-line print alias foo" }
-	{ "end"                  " >$"            "multi-line first end alias foo" }
-	{ "end"                  "hello\r\n"      "multi-line last end alias foo" } }
-
-    set define_cmd_inline {
-	{ "if 1"                      " >$"          "inline if 1" }
-	{ "python print ('hello')"    " >$"          "inline python command" }
-	{ "end"                       "hello\r\n"    "inline end" } }
-
-    set define_cmd_alias_inline {
-	{ "if 1"                      " >$"          "inline if 1 alias" }
-	{ "py print ('hello')"        " >$"          "inline python command alias" }
-	{ "end"                       "hello\r\n"    "inline end alias" } }
-
-    set define_cmd_alias_foo_inline {
-	{ "if 1"                      " >$"          "inline if 1 alias foo" }
-	{ "foo print ('hello')"       " >$"          "inline python command alias foo" }
-	{ "end"                       "hello\r\n"    "inline end alias foo" } }
+    set define_cmd_alias_not_inline [ list \
+	[ list "if 1"                 " >$"            "multi-line if 1 alias" ] \
+	[ list "py    "               " >$"            "multi-line python command alias" ] \
+	[ list "print ('hello')"      "  >$"           "multi-line print alias" ] \
+	[ list "end"                  " >$"            "multi-line first end alias" ] \
+	[ list "end"                  "hello$end"      "multi-line last end alias" ] ]
+
+    set define_cmd_alias_foo_not_inline [ list \
+	[ list "alias foo=python"     "$end"           "multi-line alias foo" ] \
+	[ list "if 1"                 " >$"            "multi-line if 1 alias foo" ] \
+	[ list "foo    "              " >$"            "multi-line python command alias foo" ] \
+	[ list "print ('hello')"      "  >$"           "multi-line print alias foo" ] \
+	[ list "end"                  " >$"            "multi-line first end alias foo" ] \
+	[ list "end"                  "hello$end"      "multi-line last end alias foo" ] ]
+
+    set define_cmd_inline [ list \
+	[ list "if 1"                      " >$"          "inline if 1" ] \
+	[ list "python print ('hello')"    " >$"          "inline python command" ] \
+	[ list "end"                       "hello$end"    "inline end" ] ]
+
+    set define_cmd_alias_inline [ list \
+	[ list "if 1"                      " >$"          "inline if 1 alias" ] \
+	[ list "py print ('hello')"        " >$"          "inline python command alias" ] \
+	[ list "end"                       "hello$end"    "inline end alias" ] ]
+
+    set define_cmd_alias_foo_inline [ list \
+	[ list "if 1"                      " >$"          "inline if 1 alias foo" ] \
+	[ list "foo print ('hello')"       " >$"          "inline python command alias foo" ] \
+	[ list "end"                       "hello$end"    "inline end alias foo" ] ]
 
     foreach t [list $define_cmd_not_inline \
 	       $define_cmd_alias_not_inline \
-- 
2.17.1 (Apple Git-112)