- CXXFLAGS += -DUSE_POPCNT
-
- ### For gcc we add also msse3 support and Link Time Optimization, note that
- ### this is a mix of compile and link time options because the lto link phase
- ### needs access to the optimization flags.
- ifeq ($(comp),gcc)
- CXXFLAGS += -msse3 -flto
- LDFLAGS += $(CXXFLAGS) -static
- endif
+ CXXFLAGS += -msse3 -DUSE_POPCNT
+endif
+
+### 3.11 Link Time Optimization, it works since gcc 4.5 but not on mingw.
+### This is a mix of compile and link time options because the lto link phase
+### needs access to the optimization flags.
+ifeq ($(comp),gcc)
+ GCC_MAJOR := `gcc -dumpversion | cut -f1 -d.`
+ GCC_MINOR := `gcc -dumpversion | cut -f2 -d.`
+ ifeq (1,$(shell expr \( $(GCC_MAJOR) \> 4 \) \| \( $(GCC_MAJOR) \= 4 \& $(GCC_MINOR) \>= 5 \)))
+ CXXFLAGS += -flto
+ LDFLAGS += $(CXXFLAGS)
+ endif