[Bug c/35746] [4.3/4.4 regression] ICE with undefined variables

[Bug c/35746] [4.3/4.4 regression] ICE with undefined variables

[reichelt at gcc dot gnu dot org]

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reichelt at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.3.1


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35746

[Bug c/35746] New: [4.3/4.4 regression] ICE with undefined variables

[reichelt at gcc dot gnu dot org]

The following invalid code snippets triggers an ICE since GCC 4.3.0:

======================
int foo(int i);

void bar()
{
  __complex__ int i;
  X j;

  if (i = foo(j))
    ;
}
======================

bug.c: In function 'bar':
bug.c:6: error: 'X' undeclared (first use in this function)
bug.c:6: error: (Each undeclared identifier is reported only once
bug.c:6: error: for each function it appears in.)
bug.c:6: error: expected ';' before 'j'
bug.c:8: error: 'j' undeclared (first use in this function)
bug.c:8: internal compiler error: in create_tmp_from_val, at gimplify.c:535
Please submit a full bug report, [etc.]

The C++ frontend is not affected.


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           Summary: [4.3/4.4 regression] ICE with undefined variables
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Keywords: ice-on-invalid-code, error-recovery, monitored
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: reichelt at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35746

[Bug c/35746] [4.3/4.4 regression] ICE with undefined variables

[pinskia at gcc dot gnu dot org]

------- Comment #1 from pinskia at gcc dot gnu dot org  2008-03-30 00:32 -------
Confirmed.


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pinskia at gcc dot gnu dot
                   |                            |org
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2008-03-30 00:32:20
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35746

[Bug c/35746] [4.3/4.4 regression] ICE with undefined variables

[pinskia at gcc dot gnu dot org]

------- Comment #2 from pinskia at gcc dot gnu dot org  2008-03-30 00:50 -------
So this was introduced by the gimplify_modify_expr changes.  The C++ front-end
actually produces error_mark_node for the call, maybe the C front-end should do
the same.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35746

[Bug c/35746] [4.3/4.4 regression] ICE with undefined variables

[jakub at gcc dot gnu dot org]

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jakub at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35746

[Bug c/35746] [4.3/4.4 regression] ICE with undefined variables

[rguenth at gcc dot gnu dot org]

------- Comment #3 from rguenth at gcc dot gnu dot org  2008-06-06 14:59 -------
4.3.1 is being released, adjusting target milestone.


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rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.3.1                       |4.3.2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35746

[Bug c/35746] [4.3/4.4 regression] ICE with undefined variables

[aldyh at gcc dot gnu dot org]

------- Comment #4 from aldyh at gcc dot gnu dot org  2008-08-05 15:24 -------
I can no longer reproduce this bug on either the 4.3 branch or mainline-- for
both C and C++.  If there is no update on this in the next week, I will close
the bug.


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aldyh at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |aldyh at gcc dot gnu dot org
                   |dot org                     |
             Status|NEW                         |ASSIGNED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35746

[Bug c/35746] [4.3 regression] ICE with undefined variables

[reichelt at gcc dot gnu dot org]

------- Comment #5 from reichelt at gcc dot gnu dot org  2008-08-08 21:40 -------
I can still reproduce this on the 4.3 branch as of 2008-08-07.
On mainline the bug disappeared between 2008-07-29 and 2008-08-02.


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reichelt at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[4.3/4.4 regression] ICE    |[4.3 regression] ICE with
                   |with undefined variables    |undefined variables


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35746

[Bug c/35746] [4.3 regression] ICE with undefined variables

[aldyh at gcc dot gnu dot org]

------- Comment #6 from aldyh at gcc dot gnu dot org  2008-08-08 23:23 -------
(In reply to comment #5)
> I can still reproduce this on the 4.3 branch as of 2008-08-07.
> On mainline the bug disappeared between 2008-07-29 and 2008-08-02.
> 

I see the error, but there is no longer an ICE.

$ ./cc1 --version
GNU C (GCC) version 4.3.2 20080808 (prerelease) [gcc-4_3-branch revision
138890] (x86_64-unknown-linux-gnu)
$ ./cc1 a.c -O2
 bar
a.c: In function 'bar':
a.c:6: error: 'X' undeclared (first use in this function)
a.c:6: error: (Each undeclared identifier is reported only once
a.c:6: error: for each function it appears in.)
a.c:6: error: expected ';' before 'j'
a.c:8: error: 'j' undeclared (first use in this function)
a.c:8: confused by earlier errors, bailing out

Is this not the expected behavior?


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35746

[Bug c/35746] [4.3 regression] ICE with undefined variables

[pinskia at gcc dot gnu dot org]

------- Comment #7 from pinskia at gcc dot gnu dot org  2008-08-08 23:25 -------
The ICE is there still, you just don't see it:
> a.c:8: confused by earlier errors, bailing out

That means there was an ICE after other errors had happened :).


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35746

[Bug c/35746] [4.3 regression] ICE with undefined variables

[reichelt at gcc dot gnu dot org]

------- Comment #8 from reichelt at gcc dot gnu dot org  2008-08-12 06:48 -------
As Andrew Pinski pointed out, we suppress ICEs after regular errors.
You have to configure the compiler with --enable-checking to see the real ICE.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35746

[Bug c/35746] [4.3 regression] ICE with undefined variables

[aldyh at gcc dot gnu dot org]

------- Comment #10 from aldyh at gcc dot gnu dot org  2008-08-12 14:06 -------
http://gcc.gnu.org/ml/gcc-patches/2008-08/msg00778.html


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aldyh at gcc dot gnu dot org changed:

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35746

[Bug c/35746] [4.3 regression] ICE with undefined variables

[aldyh at gcc dot gnu dot org]

------- Comment #9 from aldyh at gcc dot gnu dot org  2008-08-12 14:05 -------
Subject: Bug 35746

Author: aldyh
Date: Tue Aug 12 14:04:18 2008
New Revision: 139018

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=139018
Log:
        PR c/35746
        * gimplify.c (gimplify_expr): Do not convert MODIFY_EXPR to
        GIMPLE_MODIFY_STMT upon GS_ERROR.


Added:
    branches/gcc-4_3-branch/gcc/testsuite/gcc.dg/pr35746.c
Modified:
    branches/gcc-4_3-branch/gcc/ChangeLog
    branches/gcc-4_3-branch/gcc/gimplify.c


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35746

[Bug c/35746] [4.3 regression] ICE with undefined variables

[andreasmeier80 at gmx dot de]

------- Comment #11 from andreasmeier80 at gmx dot de  2008-08-12 17:14 -------
Should the testcase go also in mainline?


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35746