[Bug c++/49043] New: Returns from lambda functions incorrectly detected as "exits" from OpenMP loops in surrounding code

[bisqwit at iki dot fi]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49043

           Summary: Returns from lambda functions incorrectly detected as
                    "exits" from OpenMP loops in surrounding code
           Product: gcc
           Version: 4.6.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: bisq...@iki.fi


GCC incorrectly considers return statements within lambda functions as "exits"
from an OpenMP structured block.

For the code below, this error message is generated:

tmp3.cc: In lambda function:
tmp3.cc:7:40: error: invalid exit from OpenMP structured block

#include <iostream>
int main()
{
    #pragma omp parallel for
    for(int a=0; a<10; ++a)
    {
        auto func = [=] () { return a; };
        std::cout << func();
    }
}

Compiled with: -fopenmp -std=gnu++0x
Tested versions: 4.5.3 , 4.6.1

The purpose of this error is to catch exits from an OpenMP construct (return,
break, goto). No such thing happens when a lamdba function is called, which is
not different from calling an inlined function, therefore the error message is
misplaced.