Spurious libstdc++ testsuite failures because of truncated buffered output

[Diego Novillo]

On Fri, Mar 18, 2011 at 11:55, Andreas Schwab <schwab@redhat.com> wrote:
> Diego Novillo <dnovillo@google.com> writes:
>
>> Is there a way to increase dejagnu's buffering?
>
> expect(1):
>
>       match_max [-d] [-i spawn_id] [size]
>             defines the size of the buffer  (in  bytes)  used  internally  by
>             expect.  With no size argument, the current size is returned.
>
>             With  the -d flag, the default size is set.  (The initial default
>             is 2000.)  With the -i flag, the size is set for the named  spawn
>             id, otherwise it is set for the current process.

Thanks, but I don't think match_max affects this.  It's the output
from the compiler that is being truncated.  I modified conformance.exp
with a match_max value 10x the limit I need, but the failures are
still there:

Index: testsuite/libstdc++-dg/conformance.exp
===================================================================
--- testsuite/libstdc++-dg/conformance.exp      (revision 171068)
+++ testsuite/libstdc++-dg/conformance.exp      (working copy)
@@ -21,6 +21,8 @@
 # Initialization.
 dg-init

+match_max -d 10000000
+
 # Build the support objects.
 v3-build_support

Running <bld>/libstdc++-v3/testsuite/libstdc++-dg/conformance.exp ...
FAIL: decimal/mixed-mode_neg.cc  (test for errors, line 196)
FAIL: decimal/mixed-mode_neg.cc  (test for errors, line 197)
FAIL: decimal/mixed-mode_neg.cc  (test for errors, line 198)
FAIL: decimal/mixed-mode_neg.cc  (test for errors, line 199)
FAIL: decimal/mixed-mode_neg.cc  (test for errors, line 200)
FAIL: decimal/mixed-mode_neg.cc  (test for errors, line 201)
FAIL: decimal/mixed-mode_neg.cc  (test for errors, line 202)
FAIL: decimal/mixed-mode_neg.cc  (test for errors, line 203)

The output is clearly truncated, right before the first 'PASS' result, I see:

[ ... ]/x86_64-unknown-linux-gnu/libstdc++-v3/include/decimal/decimal.h:83:3:
note: std::decimal::decimal32&
std::decimal::decimal32::operator/=(long int)^M
/usr/local/google/hom      <<<< TRUNCATED
PASS: decimal/mixed-mode_neg.cc  (test for errors, line 43)
PASS: decimal/mixed-mode_neg.cc  (test for errors, line 44)


Diego.