Try ccache #769

simulator/Makefile

@@ -27,6 +27,13 @@ ifeq ($(USE_OPT),)
 	endif
 endif
 
+ifeq ($(CCACHE_DIR),)
+ $(info No CCACHE_DIR)
+else
+ $(info CCACHE_DIR is ${CCACHE_DIR})
+ CCPREFIX=ccache
+endif
+
 # C specific options here (added to USE_OPT).
 ifeq ($(USE_COPT),)
   USE_COPT = -std=gnu99
@@ -218,8 +225,8 @@ else
   TRGT = 
 endif
 
-CC   = $(TRGT)gcc
-CPPC = $(TRGT)g++
+CC   = $(CCPREFIX) $(TRGT)gcc
+CPPC = $(CCPREFIX) $(TRGT)g++
 # Enable loading with g++ only if you need C++ runtime support.
 # NOTE: You can use C++ even without C++ support if you are careful. C++
 #       runtime support makes code size explode.