[Bug c++/51714] New: internal compiler error: Segmentation fault with -std=c++11

[Bug c++/51714] New: internal compiler error: Segmentation fault with -std=c++11

[hyounes at google dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51714

             Bug #: 51714
           Summary: internal compiler error: Segmentation fault with
                    -std=c++11
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: hyounes@google.com


Created attachment 26205
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26205
Output from /usr/local/google/home/hyounes/gcc-svn-inst/bin/g++ -std=c++11 -c
dvlog.cc -save-temps

Command triggering bug:

/usr/local/google/home/hyounes/gcc-svn-inst/bin/g++ -v -std=c++11 -c dvlog.cc
-save-temps

(NOTE, the bug is not triggered if -std=c++11 is left out)

Compiler output:

Using built-in specs.
COLLECT_GCC=/usr/local/google/home/hyounes/gcc-svn-inst/bin/g++
COLLECT_LTO_WRAPPER=/usr/local/google/home/hyounes/gcc-svn-inst/libexec/gcc/x86_64-unknown-linux-gnu/4.7.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: /usr/local/google/home/hyounes/gcc-svn/configure
--prefix=/usr/local/google/home/hyounes/gcc-svn-inst : (reconfigured)
/usr/local/google/home/hyounes/gcc-svn/configure
--prefix=/usr/local/google/home/hyounes/gcc-svn-inst
Thread model: posix
gcc version 4.7.0 20111229 (experimental) (GCC) 
COLLECT_GCC_OPTIONS='-v' '-std=c++11' '-c' '-save-temps' '-shared-libgcc'
'-mtune=generic' '-march=x86-64'

/usr/local/google/home/hyounes/gcc-svn-inst/libexec/gcc/x86_64-unknown-linux-gnu/4.7.0/cc1plus
-E -quiet -v -D_GNU_SOURCE dvlog.cc -mtune=generic -march=x86-64 -std=c++11
-fpch-preprocess -o dvlog.ii
ignoring nonexistent directory
"/usr/local/google/home/hyounes/gcc-svn-inst/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../x86_64-unknown-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:

/usr/local/google/home/hyounes/gcc-svn-inst/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0

/usr/local/google/home/hyounes/gcc-svn-inst/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/x86_64-unknown-linux-gnu

/usr/local/google/home/hyounes/gcc-svn-inst/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/backward

/usr/local/google/home/hyounes/gcc-svn-inst/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/include
 /usr/local/include
 /usr/local/google/home/hyounes/gcc-svn-inst/include

/usr/local/google/home/hyounes/gcc-svn-inst/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/include-fixed
 /usr/include
End of search list.
COLLECT_GCC_OPTIONS='-v' '-std=c++11' '-c' '-save-temps' '-shared-libgcc'
'-mtune=generic' '-march=x86-64'

/usr/local/google/home/hyounes/gcc-svn-inst/libexec/gcc/x86_64-unknown-linux-gnu/4.7.0/cc1plus
-fpreprocessed dvlog.ii -quiet -dumpbase dvlog.cc -mtune=generic -march=x86-64
-auxbase dvlog -std=c++11 -version -o dvlog.s
GNU C++ (GCC) version 4.7.0 20111229 (experimental) (x86_64-unknown-linux-gnu)
    compiled by GNU C version 4.7.0 20111229 (experimental), GMP version 4.3.2,
MPFR version 2.4.2-p1, MPC version 0.8.1
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
GNU C++ (GCC) version 4.7.0 20111229 (experimental) (x86_64-unknown-linux-gnu)
    compiled by GNU C version 4.7.0 20111229 (experimental), GMP version 4.3.2,
MPFR version 2.4.2-p1, MPC version 0.8.1
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
Compiler executable checksum: 10d42f4b16e2234d346a8379f60d056c
dvlog.cc: In function \u2018void Foo()\u2019:
dvlog.cc:31:34: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

[Bug c++/51714] [4.7 Regression] internal compiler error: Segmentation fault with -std=c++11

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51714

Paolo Carlini <paolo.carlini at oracle dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2011-12-31
            Summary|internal compiler error:    |[4.7 Regression] internal
                   |Segmentation fault with     |compiler error:
                   |-std=c++11                  |Segmentation fault with
                   |                            |-std=c++11
     Ever Confirmed|0                           |1

[Bug c++/51714] [4.7 Regression] internal compiler error: Segmentation fault with -std=c++11

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51714

--- Comment #1 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-12-31 01:55:04 UTC ---
This is enough:

template <typename T>
void Foo()
{
  true || !__extension__ ({ int verbose = 2; verbose <= 3; });
}

int main()
{
  Foo<int>();
}

[Bug c++/51714] [4.7 Regression] internal compiler error: Segmentation fault with -std=c++11

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51714

--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-12-31 02:06:08 UTC ---
When tsubst_decl calls register_local_specialization the local_specializations
global is null.

[Bug c++/51714] [4.7 Regression] internal compiler error: Segmentation fault with -std=c++11

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51714

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |ice-on-valid-code
   Target Milestone|---                         |4.7.0

[Bug c++/51714] [4.7 Regression] internal compiler error: Segmentation fault with -std=c++11

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51714

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-12-31 12:23:05 UTC ---
Started already with
http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=166167
so no idea why it doesn't reproduce with G++ 4.6 either.

[Bug c++/51714] [4.6/4.7 Regression] internal compiler error: Segmentation fault with -std=c++11

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51714

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P4

[Bug c++/51714] [4.6/4.7 Regression] internal compiler error: Segmentation fault with -std=c++11

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51714

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |ice-checking
                 CC|                            |jason at gcc dot gnu.org
            Summary|[4.7 Regression] internal   |[4.6/4.7 Regression]
                   |compiler error:             |internal compiler error:
                   |Segmentation fault with     |Segmentation fault with
                   |-std=c++11                  |-std=c++11

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-01-03 08:37:14 UTC ---
Ah, it is a checking-only ICE.  It ICEs during:
20115    #ifdef ENABLE_CHECKING
20116      /* Try to get a constant value for all non-type-dependent
expressions in
20117          order to expose bugs in *_dependent_expression_p and constexpr. 
*/
20118      if (cxx_dialect >= cxx0x)
20119        maybe_constant_value (fold_non_dependent_expr_sfinae (expr,
tf_none));
20120    #endif
which in turn calls tsubst_decl on the verbose variable, while not called from
instantiate_decl of the containing function.
So local_specializations is NULL, retrieve_local_specialization does nothing
and
finally register_local_specialization segfaults, because it expects
local_specializations is non-NULL.

[Bug c++/51714] [4.6/4.7 Regression] internal compiler error: Segmentation fault with -std=c++11

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51714

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

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

--- Comment #6 from Jason Merrill <jason at gcc dot gnu.org> 2012-01-13 05:06:15 UTC ---
Fixed.

[Bug c++/51714] [4.6/4.7 Regression] internal compiler error: Segmentation fault with -std=c++11

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51714

--- Comment #5 from Jason Merrill <jason at gcc dot gnu.org> 2012-01-13 05:05:54 UTC ---
Author: jason
Date: Fri Jan 13 05:05:46 2012
New Revision: 183149

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=183149
Log:
    PR c++/51714
    * pt.c (value_dependent_expression_p): Treat STMT_EXPR as
    value-dependent.

Added:
    trunk/gcc/testsuite/g++.dg/ext/stmtexpr14.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/pt.c
    trunk/gcc/testsuite/ChangeLog