add example violating one-definition-rule (odr)

ref: #41

examples/violate-odr/Makefile

@@ -0,0 +1,62 @@
+PROJECT      = odr
+
+CXX          = g++
+LD           = g++
+RM           = rm -f
+
+
+SRC_DIRS     = .
+INCLUDE      = -I ../../include
+
+SRCS         = $(wildcard $(addsuffix /*.cpp, $(SRC_DIRS)))
+OBJS         = $(SRCS:.cpp=.o)
+DEPENDS      = $(OBJS:.o=.d)
+
+EXE          = $(PROJECT)
+MAP          = $(PROJECT).map
+
+
+#------------------------------------------------------------------------------
+# flags
+#
+
+# commmon flags propagated to CFLAGS, CXXFLAGS, ASFLAGS (not LDFLAGS)
+FLAGS       += $(INCLUDE)
+FLAGS       += -MMD
+
+CXXFLAGS     = $(FLAGS)
+CXXFLAGS    += -std=c++11
+CXXFLAGS    += -fno-exceptions
+CXXFLAGS    += -fno-rtti
+
+CXXFLAGS    += -Wall -Wextra
+CXXFLAGS    += -Wctor-dtor-privacy
+CXXFLAGS    += -Wcast-align -Wpointer-arith -Wredundant-decls
+CXXFLAGS    += -Wshadow -Wcast-qual -Wcast-align -pedantic
+
+LDFLAGS     += -fno-exceptions
+LDFLAGS     += -fno-rtti
+
+
+# Enable link-time optimizer
+#CXXFLAGS += -flto
+#LDFLAGS  += -flto
+
+
+.PHONY: all clean
+
+all: $(EXE)
+
+$(EXE): $(OBJS)
+	$(LD) $(OBJS) $(LDFLAGS) -o $(EXE)
+
+%.o: %.cpp
+	$(CXX) -c $(CXXFLAGS) -o $@ $<
+
+clean:
+	$(RM) *.o
+	$(RM) *.d
+	$(RM) $(EXE)
+
+
+-include $(DEPENDS)

examples/violate-odr/main.cpp

@@ -0,0 +1,8 @@
+extern void init_one();
+extern void init_two();
+
+int main()
+{
+  init_one();
+  init_two();
+}

examples/violate-odr/one.cpp

@@ -0,0 +1,21 @@
+#include <iostream>
+
+#include "tinyfsm.hpp"
+
+struct One : tinyfsm::Fsm<One>
+{
+  virtual void entry() {}
+};
+
+struct FirstState : One
+{
+  void entry() override { std::cout << "entering Firstate of One" << std::endl; }
+};
+
+FSM_INITIAL_STATE(One, FirstState);
+
+
+void init_one()
+{
+  One::start();
+}

examples/violate-odr/two.cpp

@@ -0,0 +1,21 @@
+#include <iostream>
+
+#include "tinyfsm.hpp"
+
+struct Two : tinyfsm::Fsm<Two>
+{
+  virtual void entry() {}
+};
+
+struct FirstState : Two
+{
+  void entry() override { std::cout << "entering Firstate of Two" << std::endl; }
+};
+
+FSM_INITIAL_STATE(Two, FirstState);
+
+
+void init_two()
+{
+  Two::start();
+}