Add option to use ccache when building

diff --git a/Makefile b/Makefile
index 3d3e60359b12b298f76c85e03478c02b4e177000..b9c3d14eb1ec3508301d794766726c0269b763ad 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -30,6 +30,7 @@ ENABLE_GCOV := 0
 ENABLE_GPROF := 0
 ENABLE_DEBUG := 0
 ENABLE_NDEBUG := 0
+ENABLE_CCACHE := 0
 LINK_CURSES := 0
 LINK_TERMCAP := 0
 LINK_ABC := 0
@@ -528,6 +529,10 @@ ifeq ($(ENABLE_COVER),1)
 CXXFLAGS += -DYOSYS_ENABLE_COVER
 endif
 
+ifeq ($(ENABLE_CCACHE),1)
+CXX := ccache $(CXX)
+endif
+
 define add_share_file
 EXTRA_TARGETS += $(subst //,/,$(1)/$(notdir $(2)))
 $(subst //,/,$(1)/$(notdir $(2))): $(2)