[Bug c++/55472] New: Linker cannot find lambda symbol

[Bug c++/55472] New: Linker cannot find lambda symbol

[walker_643 at yahoo dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55472

             Bug #: 55472
           Summary: Linker cannot find lambda symbol
    Classification: Unclassified
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: walker_643@yahoo.com


Created attachment 28781
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28781
Test Case

gcc -v:

Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro
4.7.2-4precise1' --with-bugurl=file:///usr/share/doc/gcc-4.7/README.Bugs
--enable-languages=c,c++,go,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.7 --enable-shared --enable-linker-build-id
--with-system-zlib --libexecdir=/usr/lib --without-included-gettext
--enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.7
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object
--enable-plugin --enable-objc-gc --disable-werror --with-arch-32=i686
--with-tune=generic --enable-checking=release --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.7.2 (Ubuntu/Linaro 4.7.2-4precise1) 


build command:  g++ -Wall -Wextra -std=c++11 -o lambda lambda.cpp


linker output:
/tmp/ccbAcPGU.o: In function `Foo::Foo(std::function<void
()>)::{lambda(Foo*)#1}::operator void (*)(Foo*)() const':
lambda.cpp:(.text._ZZN3FooC1ESt8functionIFvvEEENKUlPS_E_cvPFvS3_EEv[_ZZN3FooC1ESt8functionIFvvEEENKUlPS_E_cvPFvS3_EEv]+0x9):
undefined reference to `Foo::Foo(std::function<void
()>)::{lambda(Foo*)#1}::_FUN(Foo*)'
collect2: error: ld returned 1 exit status

[Bug c++/55472] Linker cannot find lambda symbol

[walker_643 at yahoo dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55472

--- Comment #1 from walker_643 at yahoo dot com 2012-11-26 19:48:15 UTC ---
I believe the code to be valid C++11, and, indeed it does compile, link, and
run on gcc 4.5 (as seen here http://ideone.com/VvFuMs ), but no GCC versions
4.7 - 4.8 are able to link properly.

[Bug c++/55472] Linker cannot find lambda symbol

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55472

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2012-11-26
      Known to work|                            |4.6.3
            Version|unknown                     |4.7.2
             Blocks|                            |54367
     Ever Confirmed|0                           |1
      Known to fail|                            |4.7.2, 4.8.0

[Bug c++/55472] [4.7/4.8 Regression] Linker cannot find lambda symbol

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55472

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Linker cannot find lambda   |[4.7/4.8 Regression] Linker
                   |symbol                      |cannot find lambda symbol

--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> 2012-11-26 23:38:51 UTC ---
Very likely a duplicate of PR55015.

[Bug c++/55472] [4.7/4.8 Regression] Linker cannot find lambda symbol

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55472

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

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

--- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> 2012-11-27 11:03:54 UTC ---
Dup.

*** This bug has been marked as a duplicate of bug 55015 ***