This is the mail archive of the mailing list for the GCC project.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: c++/7754: ICE SIGSEGV on union with template parameter

The following reply was made to PR c++/7754; it has been noted by GNATS.

From: =?iso-8859-1?Q?Pop_S=E9bastian?= <>
Subject: Re: c++/7754: ICE SIGSEGV on union with template parameter
Date: Sun, 29 Sep 2002 10:29:05 +0200

 On Fri, Sep 13, 2002 at 09:04:23PM -0000, wrote:
 > Synopsis: ICE SIGSEGV on union with template parameter
 > State-Changed-From-To: open->analyzed
 > State-Changed-By: nathan
 > State-Changed-When: Fri Sep 13 14:04:22 2002
 > State-Changed-Why:
 >     confirmed as a regression
 SIGSEGV happens in tree.c:
 /* Nonzero if integer constants T1 and T2 represent values that satisfy <.
    The precise way of comparison depends on their data type.  */
 tree_int_cst_lt (t1, t2)
      tree t1, t2;
   if (t1 == t2)
     return 0;
       int t1_sgn = tree_int_cst_sgn (t1);
       int t2_sgn = tree_int_cst_sgn (t2);
       if (t1_sgn < t2_sgn)
         return 1;
       else if (t1_sgn > t2_sgn)
         return 0;
       /* Otherwise, both are non-negative, so we compare them as
          unsigned just in case one of them would overflow a signed
          type.  */
   else if (! TREE_UNSIGNED (TREE_TYPE (t1)))
     return INT_CST_LT (t1, t2);
   return INT_CST_LT_UNSIGNED (t1, t2);
 At this point t2 is equal to 0, and that crashes the compiler.
 The following patch introduced this code without checking of non-NULL for t2:
 2002-04-26  Alexandre Oliva  <>
 Alexandre, could you review this patch and the associated bug-report please?

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]