[Bug c++/63142] gcc-cilk can not spawn a function template

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63142

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Try:
g++ -o fib -fcilkplus -lcilkrts fib.cpp

instead.