[RFA] Testsuite: Change match_max for current also

["Pierre Muller" <muller@ics.u-strasbg.fr>]

  I got several "internal buffer full" errors
in the results of the testsuite, especially on gcc16.

  I finally discovered that the expect command
match_max is made for that:
  change the size of the internal buffer used for
pattern matching.

  In lib/gdb.exp, I found this:

match_max -d 30000

  But then, in several other tests 
(gdb.base/annota1.exp, gdb.base/annota3.exp and gdb.base/maint.exp), 
that said that they wanted to increase the size
of the buffer, but used smaller values than the 30000
above... I was lost :(


In annota1.exp, I found that:
    verbose "match_max local is: [match_max]"
    verbose "match_max default is: [match_max -d]"
    # This is necessary because a 2000 buffer is not enought to get
everything
    # up to the prompt ad the test gets a timeout.
    match_max 3000
    verbose "match_max now is: [match_max]"

Running annota1.exp with -v option in RUNTESTFLAGS,
I discovered that the local value of match_max still was the
expect default of 2000...

  After digging into the expect sources, I found out
that using 
  match_max -d 3000
changes the default value, but only for later started jobs,
meaning that it does not change the current value.
 Adding
  'match_max [match_max -d]'
right after 'match_max -d 30000'
did fix the problem!

This removes a "internal buffer full" ERROR
in gcc16 testsuite on
gdb.server/ext-run.exp: get process list

Is this OK?

Pierre Muller

PS1: If this is approved, we should also 
consider what to do about the three tests
that set another value of match_max
(lower than the 30000).

PS2: calling 'match_max -d 30000'
several times is a waste of time,
as long as nothing changes that default value
in any of the tests, should it rather be 
extracted out of default_gdb_init,
so that it get executed only once?


gdb/testsuite/ChangeLog entry:

2009-10-02  Pierre Muller  <muller@ics.u-strasbg.fr>

	* lib/gdb.exp (default_gdb_init): Set current value of match_max 
	to default.

Index: src/gdb/testsuite/lib/gdb.exp
===================================================================
RCS file: /cvs/src/src/gdb/testsuite/lib/gdb.exp,v
retrieving revision 1.119
diff -u -F^proc  -r1.119 gdb.exp
--- src/gdb/testsuite/lib/gdb.exp	13 Jul 2009 19:24:18 -0000
1.119
+++ src/gdb/testsuite/lib/gdb.exp	2 Oct 2009 13:28:57 -0000
@@ -2326,6 +2326,8 @@ proc default_gdb_init { args } {
     # a very large amount of output.  We therefore increase the expect
     # buffer size to be able to contain the entire test output.
     match_max -d 30000
+    # Also set this value for the currently running GDB. 
+    match_max [match_max -d]
 
     # We want to add the name of the TCL testcase to the PASS/FAIL
messages.
     if { [llength $args] > 0 } {