[PATCH, testsuite] Avoid testsuite harness failure on i686-mingw32 host

[Maxim Kuvyrkov <maxim@codesourcery.com>]

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This patch improves testing on i686-mingw32 host.  One of the tests in interrupt.exp assumes that Control-D is EOF, which is not the case for Windows hosts.  After the test timeouts the testsuite doesn't get GDB prompt back, which causes all subsequent tests to fail.

OK to apply?

Thank you,

--
Maxim Kuvyrkov
CodeSourcery / Mentor Graphics



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2012-11-15  Maxim Kuvyrkov  <maxim@codesourcery.com>

	gdb/testsuite/
	* gdb.base/interrupt.exp: Workaround problem of sending EOF on Windows
	hosts.

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Index: gdb/testsuite/gdb.base/interrupt.exp
===================================================================
RCS file: /cvs/src/src/gdb/testsuite/gdb.base/interrupt.exp,v
retrieving revision 1.22
diff -u -p -r1.22 interrupt.exp
--- gdb/testsuite/gdb.base/interrupt.exp	16 Jan 2012 16:21:44 -0000	1.22
+++ gdb/testsuite/gdb.base/interrupt.exp	16 Nov 2012 03:43:06 -0000
@@ -194,14 +194,28 @@ if ![file exists $binfile] then {
 	    }
 	}
 
-	send_gdb "\004"
-	gdb_expect {
-	    -re "end of file.*$inferior_exited_re normally.*$gdb_prompt $" {
-		pass "send end of file"
+	# Control-D is not EOF on Windows hosts, so skip this test.
+	if { ! [ishost i686-*-mingw32] } {
+	    send_gdb "\004"
+	    gdb_expect {
+		-re "end of file.*$inferior_exited_re normally.*$gdb_prompt $" {
+		    pass "send end of file"
+		}
+		-re "$gdb_prompt $" { fail "send end of file" }
+		timeout { fail "send end of file (timeout)" }
+		eof { fail "send end of file (eof)" }
+	    }
+	} else {	
+	    # Interrupt GDB to get the prompt back.  Killing GDB while the
+	    # remote stub is waiting for file I/O may confuse it for future
+	    # tests.
+	    set msg "Send Control-C to get the prompt"
+	    send_gdb "\003"
+	    gdb_test_multiple "" "$msg" {
+		-re "Program received signal SIGINT.*$gdb_prompt $" {
+		    pass "$msg"
+		}
 	    }
-	    -re "$gdb_prompt $" { fail "send end of file" }
-	    timeout { fail "send end of file (timeout)" }
-	    eof { fail "send end of file (eof)" }
 	}
     }
 }