[Bug c++/47688] New: [C++0x] Segfault when assigning lambda to std::function variable

[vituscze at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47688

           Summary: [C++0x] Segfault when assigning lambda to
                    std::function variable
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: vitus...@gmail.com


Created attachment 23301
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=23301
Output of -save-temps

Hello,

g++ crashes while compiling following code (if it is of any use):

#include <functional>

int main()
{
    std::function <void (int)> f = [] (int& x) // type mismatch on purpose
    {
        x += 3;
    };
}

Command line:
g++ -std=c++0x -Wall crash2.cpp

Compiler crashes with following error:
In file included from crash2.cpp:1:0:
c:\gcc\bin\../lib/gcc/i686-pc-mingw32/4.6.0/../../../../include/c++/4.6.0/functional:
In static member function 'static void std::_Function_handler<void(_ArgTypes
...), _Functor>::_M_invoke(const std::_Any_data&, _ArgTypes ...) [with _Functor
= main()::<lambda(int&)>, _ArgTypes = {int}]':
c:\gcc\bin\../lib/gcc/i686-pc-mingw32/4.6.0/../../../../include/c++/4.6.0/functional:2135:6:
  instantiated from 'std::function<_Res(_ArgTypes ...)>::function(_Functor,
typename std::enable_if<(! std::is_integral<_Functor>::value),
std::function<_Res(_ArgTypes ...)>::_Useless>::type) [with _Functor =
main()::<lambda(int&)>, _Res = void, _ArgTypes = {int}, typename
std::enable_if<(! std::is_integral<_Functor>::value),
std::function<_Res(_ArgTypes ...)>::_Useless>::type =
std::function<void(int)>::_Useless]'
crash2.cpp:8:2:   instantiated from here
c:\gcc\bin\../lib/gcc/i686-pc-mingw32/4.6.0/../../../../include/c++/4.6.0/functional:1765:9:
error: no match for call to '(main()::<lambda(int&)>) (int)'
crash2.cpp:5:34: note: candidates are:
c:\gcc\bin\../lib/gcc/i686-pc-mingw32/4.6.0/../../../../include/c++/4.6.0/functional:1765:9:
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.

Using GCC 4.6.0 20110205 on Windows Vista (32bit).

Output of g++ -v:
Built by Equation Solution <http://www.Equation.com>.
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=c:/gcc/bin/../libexec/gcc/i686-pc-mingw32/4.6.0/lto-wrapper.exe
Target: i686-pc-mingw32
Configured with: ../gcc-4.6-20110205-mingw/configure --host=i686-pc-mingw32
--build=x86_64-unknown-linux-gnu --target=i686-pc-mingw32
--prefix=/home/gfortran/gcc-home/binary/mingw32/native/x86_32/gcc/4.6-20110205
--with-lto-plugin --with-gcc --with-gnu-ld --with-gnu-as
--with-host-libstdcxx='-lstdc++ -lsupc++ -lm'
--with-ppl=/home/gfortran/gcc-home/binary/mingw32/native/x86_32/ppl
--with-cloog=/home/gfortran/gcc-home/binary/mingw32/native/x86_32/cloog
--with-gmp=/home/gfortran/gcc-home/binary/mingw32/native/x86_32/gmp
--with-mpfr=/home/gfortran/gcc-home/binary/mingw32/native/x86_32/mpfr
--with-mpc=/home/gfortran/gcc-home/binary/mingw32/native/x86_32/mpc
--with-sysroot=/home/gfortran/gcc-home/binary/mingw32/cross/x86_32/gcc/4.6-20110205
--enable-languages=c,c++,fortran --enable-libgomp --enable-threads=win32
--enable-lto --enable-static --enable-cloog-backend=ppl --disable-shared
--disable-nls --disable-tls --disable-win32-registry
Thread model: win32
gcc version 4.6.0 20110205 (experimental) (GCC)

Output of g++ -std=c++0x crash2.cpp -save-temps is in attachment.

Thanks for your time,
Vít Šefl