ccache support

Makefile

@@ -1,7 +1,7 @@
 
-include Makefile.defs
 -include Makefile.platform
 -include .Makefile.options.cache
+include Makefile.defs
 include common_arm/Makefile.hal
 
 # preserve relative DESTDIR path for subdir makes

Makefile.platform.sample

@@ -6,3 +6,8 @@ PLATFORM=PM3RDV4
 # If you want more than one PLATFORM_EXTRAS option, separate them by spaces:
 #PLATFORM_EXTRAS=BTADDON
 #STANDALONE=LF_SAMYRUN
+
+# To accelerate repetitive compilations:
+# Install package "ccache" -> Debian/Ubuntu: /usr/lib/ccache, Fedora/CentOS/RHEL: /usr/lib64/ccache
+# And uncomment the following line
+#export PATH := /usr/lib64/ccache:/usr/lib/ccache:${PATH}

client/Makefile

@@ -4,7 +4,6 @@
 # the license.
 #-----------------------------------------------------------------------------
 
-include ../Makefile.defs
 ifeq ($(PLTNAME),)
     -include ../Makefile.platform
     -include ../.Makefile.options.cache
@@ -12,6 +11,7 @@ ifeq ($(PLTNAME),)
         $(error platform definitions have been changed, please "make clean" at the root of the project)
     endif
 endif
+include ../Makefile.defs
 
 ifeq ($(PLATFORM),PM3ICOPYX)
   INCLUDES += -DICOPYX