[Bug c++/48265] New: [4.6/4.7 Regression] ICE: SIGSEGV (recursion in value_dependent_expression_p) when variable is used uninitialised

[Bug c++/48265] New: [4.6/4.7 Regression] ICE: SIGSEGV (recursion in value_dependent_expression_p) when variable is used uninitialised

[zsojka at seznam dot cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48265

           Summary: [4.6/4.7 Regression] ICE: SIGSEGV (recursion in
                    value_dependent_expression_p) when variable is used
                    uninitialised
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: zsojka@seznam.cz


Looks similiar to PR46870, but this code is valid:

------- testcase.C -------
template < int > struct S
{
  S () { int i = i; i; };
};
--------------------------

Compiler output:
$ gcc -std=gnu++0x testcase.C
Program received signal SIGSEGV, Segmentation fault.
0x000000000054e883 in value_dependent_expression_p (expression=<value optimized
out>) at /mnt/svn/gcc-trunk/gcc/cp/pt.c:18065
18065     if (DECL_P (expression) && type_dependent_expression_p (expression))
(gdb) bt
#0  0x000000000054e883 in value_dependent_expression_p (expression=<value
optimized out>) at /mnt/svn/gcc-trunk/gcc/cp/pt.c:18065
#1  0x000000000054ea7e in value_dependent_expression_p (expression=<value
optimized out>) at /mnt/svn/gcc-trunk/gcc/cp/pt.c:18233
#2  0x000000000054ea7e in value_dependent_expression_p (expression=<value
optimized out>) at /mnt/svn/gcc-trunk/gcc/cp/pt.c:18233
#3  0x000000000054ea7e in value_dependent_expression_p (expression=<value
optimized out>) at /mnt/svn/gcc-trunk/gcc/cp/pt.c:18233
#4  0x000000000054ea7e in value_dependent_expression_p (expression=<value
optimized out>) at /mnt/svn/gcc-trunk/gcc/cp/pt.c:18233
#5  0x000000000054ea7e in value_dependent_expression_p (expression=<value
optimized out>) at /mnt/svn/gcc-trunk/gcc/cp/pt.c:18233
#6  0x000000000054ea7e in value_dependent_expression_p (expression=<value
optimized out>) at /mnt/svn/gcc-trunk/gcc/cp/pt.c:18233
#7  0x000000000054ea7e in value_dependent_expression_p (expression=<value
optimized out>) at /mnt/svn/gcc-trunk/gcc/cp/pt.c:18233
#8  0x000000000054ea7e in value_dependent_expression_p (expression=<value
optimized out>) at /mnt/svn/gcc-trunk/gcc/cp/pt.c:18233
#9  0x000000000054ea7e in value_dependent_expression_p (expression=<value
optimized out>) at /mnt/svn/gcc-trunk/gcc/cp/pt.c:18233
...

[Bug c++/48265] [4.6/4.7 Regression] [C++0x] ICE: SIGSEGV (recursion in value_dependent_expression_p) when variable is used uninitialised

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48265

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.6.1

[Bug c++/48265] [4.6/4.7 Regression] [C++0x] ICE: SIGSEGV (recursion in value_dependent_expression_p) when variable is used uninitialised

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48265

Jason Merrill <jason at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2011.03.29 21:14:12
                 CC|                            |jason at gcc dot gnu.org
         AssignedTo|unassigned at gcc dot       |jason at gcc dot gnu.org
                   |gnu.org                     |
     Ever Confirmed|0                           |1

--- Comment #1 from Jason Merrill <jason at gcc dot gnu.org> 2011-03-29 21:14:12 UTC ---
Got it.

[Bug c++/48265] [4.6/4.7 Regression] [C++0x] ICE: SIGSEGV (recursion in value_dependent_expression_p) when variable is used uninitialised

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48265

--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> 2011-03-30 02:16:27 UTC ---
Author: jason
Date: Wed Mar 30 02:16:22 2011
New Revision: 171714

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=171714
Log:
    PR c++/48265
    * pt.c (value_dependent_expression_p) [VAR_DECL]: Make sure
    the variable is constant before looking at its initializer.

Added:
    trunk/gcc/testsuite/g++.dg/cpp0x/regress/value-dep1.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/pt.c
    trunk/gcc/testsuite/ChangeLog

[Bug c++/48265] [4.6/4.7 Regression] [C++0x] ICE: SIGSEGV (recursion in value_dependent_expression_p) when variable is used uninitialised

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48265

--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> 2011-03-30 02:16:44 UTC ---
Author: jason
Date: Wed Mar 30 02:16:37 2011
New Revision: 171715

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=171715
Log:
    PR c++/48265
    * pt.c (value_dependent_expression_p) [VAR_DECL]: Make sure
    the variable is constant before looking at its initializer.

Added:
    branches/gcc-4_6-branch/gcc/testsuite/g++.dg/cpp0x/regress/value-dep1.C
Modified:
    branches/gcc-4_6-branch/gcc/cp/ChangeLog
    branches/gcc-4_6-branch/gcc/cp/pt.c
    branches/gcc-4_6-branch/gcc/testsuite/ChangeLog

[Bug c++/48265] [4.6/4.7 Regression] [C++0x] ICE: SIGSEGV (recursion in value_dependent_expression_p) when variable is used uninitialised

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48265

--- Comment #4 from Jason Merrill <jason at gcc dot gnu.org> 2011-03-30 02:35:48 UTC ---
*** Bug 46870 has been marked as a duplicate of this bug. ***

[Bug c++/48265] [4.6/4.7 Regression] [C++0x] ICE: SIGSEGV (recursion in value_dependent_expression_p) when variable is used uninitialised

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48265

Jason Merrill <jason at gcc dot gnu.org> changed:

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

--- Comment #5 from Jason Merrill <jason at gcc dot gnu.org> 2011-03-30 02:36:43 UTC ---
Fixed for 4.6.1.

[Bug c++/48265] [4.6/4.7 Regression] [C++0x] ICE: SIGSEGV (recursion in value_dependent_expression_p) when variable is used uninitialised

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48265

--- Comment #6 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-05-02 16:07:56 UTC ---
*** Bug 46871 has been marked as a duplicate of this bug. ***