[Bug testsuite/12647] New: racy: gdb.mi/ must not use gdb_test_multiple

["jan.kratochvil at redhat dot com" <sourceware-bugzilla@sourceware.org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=12647

           Summary: racy: gdb.mi/ must not use gdb_test_multiple
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: testsuite
        AssignedTo: unassigned@sourceware.org
        ReportedBy: jan.kratochvil@redhat.com


gdb_test_multiple contains
         -re "\r\n$gdb_prompt $" {
            if ![string match "" $message] then {
                fail "$message"

but this may falsely match an unfinished output expected to be matched by:
    gdb_test_multiple "-environment-path" "-environment-path" {
        -re "\\\^done,path=\"\(.*\)\"\r\n$mi_gdb_prompt" {

as mi_gdb_prompt is (without the angle brackets, ^M as \r\n delimiter):
<[(]gdb[)] ^M
>
while gdb_prompt is (without the angle brackets):
<\(gdb\)>

Unfortunately there ar 23 uses of gdb_test_multiple in gdb.mi/*.exp.

 PASS: gdb.mi/mi2-basics.exp: environment-pwd operation
 -environment-path^M
 ^done,path="/usr/local/bin:/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/sbin"^M
-(gdb) ^M
+(gdb) FAIL: gdb.mi/mi2-basics.exp: -environment-path
 Expecting: ^(207-environment-path[^M

]+)?(207\^done,path="/usr/local/bin:/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/sbin"[^M
 ]+[(]gdb[)] ^M
 [ ]*)
+^M
 207-environment-path^M
 207^done,path="/usr/local/bin:/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/sbin"^M
 (gdb) ^M
-PASS: gdb.mi/mi2-basics.exp: environment-path no-args operation
+FAIL: gdb.mi/mi2-basics.exp: environment-path no-args operation

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