[Bug libstdc++/21842] New: [4.1 Regression] 23_containers/bitset/operations/2.cc execution test fails

[Bug libstdc++/21842] New: [4.1 Regression] 23_containers/bitset/operations/2.cc execution test fails

[jsm28 at gcc dot gnu dot org]

FAIL: 23_containers/bitset/operations/2.cc execution test
has appeared on mainline on i686-pc-linux-gnu between 20050530 and 20050531.

-- 
           Summary: [4.1 Regression] 23_containers/bitset/operations/2.cc
                    execution test fails
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libstdc++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jsm28 at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21842

[Bug libstdc++/21842] [4.1 Regression] 23_containers/bitset/operations/2.cc execution test fails

[pcarlini at suse dot de]

------- Additional Comments From pcarlini at suse dot de  2005-05-31 16:49 -------
Notice that *nothing* changed in the relevant libstdc++-v3 code. Generally, only
small, confined changes lately. Either this is a miscompilation or a *very* long
standing latent problem. Can you attach the *.log excerpt? Even better, take care
of the obvious checks, like compiling at lower optimization level? (I'm also
going to do that, anyway: we want to ascertain the miscompilation and recategorize
as soon as possible, in case)

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21842

[Bug middle-end/21842] [4.1 Regression] 23_containers/bitset/operations/2.cc execution test fails

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-05-31 16:50 -------
I want to say the same patch which broke 920501-2.c also broke this.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
  BugsThisDependsOn|                            |21843
          Component|libstdc++                   |middle-end
           Keywords|                            |wrong-code
   Target Milestone|---                         |4.1.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21842

[Bug middle-end/21842] [4.1 Regression] 23_containers/bitset/operations/2.cc execution test fails

[pcarlini at suse dot de]

------- Additional Comments From pcarlini at suse dot de  2005-05-31 16:59 -------
... well, at least both involve shifts ;)

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21842

[Bug middle-end/21842] [4.1 Regression] 23_containers/bitset/operations/2.cc execution test fails

[joseph at codesourcery dot com]

------- Additional Comments From joseph at codesourcery dot com  2005-05-31 17:05 -------
Subject: Re:  [4.1 Regression] 23_containers/bitset/operations/2.cc
 execution test fails

On Tue, 31 May 2005, pcarlini at suse dot de wrote:

> Notice that *nothing* changed in the relevant libstdc++-v3 code. Generally, only
> small, confined changes lately. Either this is a miscompilation or a *very* long
> standing latent problem. Can you attach the *.log excerpt? Even better, take care
> of the obvious checks, like compiling at lower optimization level? (I'm also
> going to do that, anyway: we want to ascertain the miscompilation and recategorize
> as soon as possible, in case)

Executing on host: g++ -g -O2 -D_GLIBCXX_ASSERT -fmessage-length=0 
-DLOCALEDIR="/scratch/gcc/nightly-2005-05-31-mainline/i686-pc-linux-gnu/build_gcc/install/bin/../share/locale" 
-I/home/gcc/nightlies/src-mainline-2005-05-31/gcc-mainline/libstdc++-v3/testsuite 
testsuite_abi.o testsuite_allocator.o testsuite_character.o 
testsuite_hooks.o 
/home/gcc/nightlies/src-mainline-2005-05-31/gcc-mainline/libstdc++-v3/testsuite/23_containers/bitset/operations/2.cc    
-include bits/stdc++.h  -lm   -o ./2.exe    (timeout = 300)
PASS: 23_containers/bitset/operations/2.cc (test for excess errors)
Setting LD_LIBRARY_PATH to 
:/scratch/gcc/nightly-2005-05-31-mainline/i686-pc-linux-gnu/build_gcc/install/lib:/usr/local/tools/gcc-3.4.0/lib
2.exe: 
/home/gcc/nightlies/src-mainline-2005-05-31/gcc-mainline/libstdc++-v3/testsuite/23_containers/bitset/operations/2.cc:33: 
bool test02(): Assertion `b.count() == 0' failed.
FAIL: 23_containers/bitset/operations/2.cc execution test

(this is installed compiler testing, hence the short command line).  
Testing manually it seems to fail with -O2 or -O but not -O0.

In general when reporting bugs shown up by my regression tester I don't 
know what part of the compiler they are in; I check enough to make sure 
they don't appear to be system problems and aren't already reported with 
reference to the named testcase or discussed on the lists as fixed, but 
not to determine the exact cause.



-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21842

[Bug middle-end/21842] [4.1 Regression] 23_containers/bitset/operations/2.cc execution test fails

[pcarlini at suse dot de]

------- Additional Comments From pcarlini at suse dot de  2005-05-31 17:14 -------
> Testing manually it seems to fail with -O2 or -O but not -O0.

Ah, ah, the same happens for the other regression that you just filed, it
seems! Thanks.

> In general when reporting bugs shown up by my regression tester I don't 
> know what part of the compiler they are in; I check enough to make sure 
> they don't appear to be system problems and aren't already reported with 
> reference to the named testcase or discussed on the lists as fixed, but 
> not to determine the exact cause.

Ok, this is by itself absolutely useful, of course. Only, categorizing as
libstdc++-v3 can be "distracting", you know what I mean? Luckily, we have
our trusty "bug masters" to take care of that ;)

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21842

[Bug middle-end/21842] [4.1 Regression] 23_containers/bitset/operations/2.cc execution test fails

[joseph at codesourcery dot com]

------- Additional Comments From joseph at codesourcery dot com  2005-05-31 17:46 -------
Subject: Re:  [4.1 Regression] 23_containers/bitset/operations/2.cc
 execution test fails

On Tue, 31 May 2005, pcarlini at suse dot de wrote:

> Ok, this is by itself absolutely useful, of course. Only, categorizing as
> libstdc++-v3 can be "distracting", you know what I mean? Luckily, we have
> our trusty "bug masters" to take care of that ;)

Indeed, I leave it to the bugmasters to decide if there's a component 
which is a better approximation, or that the bug is the same as another 
one not mentioning the testcase in question, or is an issue fixed without 
mentioning the testcase.  Where the bug doesn't happen on i686-linux I may 
in due course run a binary search to identify the responsible patch.



-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21842

[Bug middle-end/21842] [4.1 Regression] 23_containers/bitset/operations/2.cc execution test fails

[pinskia at gcc dot gnu dot org]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
 GCC target triplet|                            |i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21842

[Bug middle-end/21842] [4.1 Regression] 23_containers/bitset/operations/2.cc execution test fails

[jsm28 at gcc dot gnu dot org]

------- Additional Comments From jsm28 at gcc dot gnu dot org  2005-06-01 17:53 -------
Fixed mainline 20050601.


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |FIXED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21842

[Bug middle-end/21842] [4.1 Regression] 23_containers/bitset/operations/2.cc execution test fails

[jsm28 at gcc dot gnu dot org]

-- 
Bug 21842 depends on bug 21843, which changed state.

Bug 21843 Summary: [4.1 Regression] gcc.c-torture/execute/920501-2.c execution fails
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21843

           What    |Old Value                   |New Value
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |FIXED

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21842