[Bug c++/52026] New: [c++0x] g++: Constexpr Variable Appears Uninitialized in Lambda

[cheesear at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52026

             Bug #: 52026
           Summary: [c++0x] g++: Constexpr Variable Appears Uninitialized
                    in Lambda
    Classification: Unclassified
           Product: gcc
           Version: 4.6.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: cheesear@gmail.com


Created attachment 26487
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26487
The code sample exhibiting the suspected bug.

Hello everyone,

In the code fragment below, g++ (4.6.1 on Linux Mint 64-bit) complains that x
is uninitialized in the lambda function, and prints out an initialized value
from the stack for the last three lines of the program's output. I'd except all
four lines of the output to be '5', so I suspect that this may be a compiler
bug.

Also, even without the reference-capture in the lambda function, the code still
compiles. Below follows the command used to compile the code, along with one
possible output.

# g++ -Wall -std=c++0x c.cpp
c.cpp: In lambda function:
c.cpp:25:4: warning: ‘x’ is used uninitialized in this function
[-Wuninitialized]

# ./a.out
5
32535
32535
32535