[PATCH] gdb/testsuite: Fix testing of "info copying"

[Thiago Jung Bauermann <thiago.bauermann@linaro.org>]

gdb.base/default.exp has an incomplete test for the "info copying" command,
as poetically pointed out by the FIXME removed by this patch.

The test omits the pattern argument to gdb_test, which causes it to just
check for a GDB prompt at the end of the command output.

The problem is that the command output is the whole GPLv3 license, which
due to its size causes the test to fail sometimes, making the testcase to
be out of sync with GDB's output and failing the tests that follow
it. E.g.,

  FAIL: gdb.base/default.exp: info copying (timeout)
  FAIL: gdb.base/default.exp: info display
  FAIL: gdb.base/default.exp: info frame "f" abbreviation
  PASS: gdb.base/default.exp: info frame
  FAIL: gdb.base/default.exp: info files
  FAIL: gdb.base/default.exp: info float
  FAIL: gdb.base/default.exp: info functions
  FAIL: gdb.base/default.exp: info locals
  FAIL: gdb.base/default.exp: info program
  FAIL: gdb.base/default.exp: info registers
  FAIL: gdb.base/default.exp: info stack "s" abbreviation

Fix by by checking for a few excerpts at the beginning, middle and end of
the license text.  This makes the test consume the command's output in
smallish chunks.
---
 gdb/testsuite/gdb.base/default.exp | 94 +++++++++++++++++++++++++++---
 1 file changed, 87 insertions(+), 7 deletions(-)

diff --git a/gdb/testsuite/gdb.base/default.exp b/gdb/testsuite/gdb.base/default.exp
index 2b5294fcddd7..912b0c881bb0 100644
--- a/gdb/testsuite/gdb.base/default.exp
+++ b/gdb/testsuite/gdb.base/default.exp
@@ -267,13 +267,93 @@ gdb_test "info bogus-gdb-command" "Undefined info command: \"bogus-gdb-command\"
 #test info breakpoints
 gdb_test "info breakpoints" "No breakpoints or watchpoints."
 #test info copying
-# FIXME -- doesn't work worth a shit
-#send_gdb "info copying"
-#	-re "GNU GENERAL PUBLIC LICENSE.*#of preserving the free status of all derivatives of our free software and.*#of promoting the sharing and reuse of software generally."# 
-gdb_test "info copying"
-#	}
-#
-#
+# The license text is very big, so it may overwhelm Expect's output buffer
+# and cause the test to fail occasionally.  To avoid this problem, verify
+# the command's output in small chunks.
+set saw_header 0
+set saw_terms 0
+set saw_section5 0
+set saw_section7 0
+set saw_section10 0
+set saw_section14 0
+set saw_last_para 0
+# These excerpts were chosen for no particular reason, except that they
+# occur at the beginning, middle and end of the license text.
+set re_header [multi_line \
+		   "\\s+GNU GENERAL PUBLIC LICENSE" \
+		   "\\s+Version 3, 29 June 2007" \
+		   "" \
+		   " Copyright \\(C\\) 2007 Free Software Foundation, Inc. <http://fsf.org/>" \
+		   " Everyone is permitted to copy and distribute verbatim copies" \
+		   " of this license document, but changing it is not allowed." \
+		   "" \
+		   "\\s+Preamble" \
+		   "" \
+		   "  The GNU General Public License is a free, copyleft license for" \
+		   "software and other kinds of works.\r\n"]
+set re_terms [multi_line \
+		  "\\s+TERMS AND CONDITIONS" \
+		  "" \
+		  "  0. Definitions." \
+		  "" \
+		  "  \"This License\" refers to version 3 of the GNU General Public License.\r\n"]
+set re_section5 [multi_line \
+		     "  5. Conveying Modified Source Versions." \
+		     "" \
+		     "  You may convey a work based on the Program, or the modifications to\r\n"]
+set re_section7 [multi_line \
+		     "  7. Additional Terms." \
+		     "" \
+		     "  \"Additional permissions\" are terms that supplement the terms of this\r\n"]
+set re_section10 [multi_line \
+		      "  10. Automatic Licensing of Downstream Recipients." \
+		      "" \
+		      "  Each time you convey a covered work, the recipient automatically\r\n"]
+set re_section14 [multi_line \
+		      "  14. Revised Versions of this License." \
+		      "" \
+		      "  The Free Software Foundation may publish revised and/or new versions of\r\n"]
+set re_last_para [multi_line \
+		      "  Later license versions may give you additional or different" \
+		      "permissions.  However, no additional obligations are imposed on any" \
+		      "author or copyright holder as a result of your choosing to follow a" \
+		      "later version.\r\n"]
+set test "info copying"
+gdb_test_multiple $test $test {
+    -re $re_header {
+	set saw_header 1
+	exp_continue
+    }
+    -re $re_terms {
+	set saw_terms 1
+	exp_continue
+    }
+    -re $re_section5 {
+	set saw_section5 1
+	exp_continue
+    }
+    -re $re_section7 {
+	set saw_section7 1
+	exp_continue
+    }
+    -re $re_section10 {
+	set saw_section10 1
+	exp_continue
+    }
+    -re $re_section14 {
+	set saw_section14 1
+	exp_continue
+    }
+    -re $re_last_para {
+	set saw_last_para 1
+	exp_continue
+    }
+    -re "$gdb_prompt \$" {
+	gdb_assert { $saw_header && $saw_terms && $saw_section5 \
+			 && $saw_section7 && $saw_section10 \
+			 && $saw_section14 && $saw_last_para } $test
+    }
+}
 #test info display
 gdb_test "info display" "There are no auto-display expressions now."
 #test info frame "f" abbreviation