Template specialization fails in gcc < 7.0.0

[HaskiDuan]

Hi Axel,
I'm trying to compile the tinyfsm under ubuntu 16.04, my g++ version is 5.4.0. But when I run make under example, I get the following error:

In file included from motor.cpp:1:0:
../../include/tinyfsm.hpp:235:63: error: specialization of ‘template<class F> static void tinyfsm::Fsm<F>::set_initial_state()’ in different namespace [-fpermissive]
   template<> void tinyfsm::Fsm< _FSM >::set_initial_state(void) {     \
                                                               ^
motor.cpp:62:1: note: in expansion of macro ‘FSM_INITIAL_STATE’
 FSM_INITIAL_STATE(Motor, Stopped)
 ^
../../include/tinyfsm.hpp:96:17: error:   from definition of ‘template<class F> static void tinyfsm::Fsm<F>::set_initial_state()’ [-fpermissive]
     static void set_initial_state();
                 ^
Makefile:90: recipe for target 'motor.o' failed
make: *** [motor.o] Error 1

Would you help me to fix it ?
Thank you,
Husky

[digint]

does this help?

replace macro in "include/tinyfsm.hpp":

#define FSM_INITIAL_STATE(_FSM, _STATE)                               \
namespace tinyfsm {                                                   \
  template<> void Fsm< _FSM >::set_initial_state(void) {              \
    current_state_ptr = &_state_instance< _STATE >::value;            \
  }                                                                   \
}

Edit: You are probably hitting a compiler bug here, see:

• https://stackoverflow.com/questions/25594644/warning-specialization-of-template-in-different-namespace#25594741
• https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56480

[HaskiDuan]

Yeah, it works fine now.
Thanks for your code and help!

[digint]

fixed in: 9d0e1c3