http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52688
--- Comment #9 from Paolo Carlini <paolo.carlini at oracle dot com> 2013-03-01
23:08:40 UTC ---
(In reply to comment #8)
> I just came across the same issue in the context of lambdas (for posterity,
> since I spent time thinking this was specific to lambdas).
>
> Consider the following source code:
> ---------------------------------------------------
> template<typename T>
> void Foo()
> {
> static int i = 5;
> auto bar = [&]() { ++i; };
> bar();
> }
>
> int main()
> {
> Foo<int>();
> }
> ---------------------------------------------------
> GCC 4.7.0 produces the following error:
>
> # g++-4.7 -std=c++11 main.cpp
> /tmp/ccbZwBzT.o: In function `void Foo<int>()::{lambda()#1}::operator()()
> const':
> main.cpp:(.text+0x1a): undefined reference to `i'
> main.cpp:(.text+0x23): undefined reference to `i'
> collect2: error: ld returned 1 exit status
Can't be exactly the same issue: mainline and 4.7.3 get this one right.
