Revert "Make all executables overridable"

If these executables are not overridden in the child makefile, then the
default values are not set properly in the master makefile.

This complicates the solution for #119 :(

This reverts commit 66eec82a3a.

HISTORY.md

@@ -20,7 +20,6 @@ The following is the rough list of changes that went into different versions. I
 - Autodetect baudrate only if either a .ino/.pde is present
 - Allow building with Arduino core, without a .ino/.pde file
 - Ability to support different Arduino cores (https://github.com/sej7278)
-- Add support for colorgcc
 
 ### 0.12.0 (2013-06-20)
 - Fix "generated_assembly" target, which got broken earlier. Fix issue #76 (https://github.com/matthijskooijman)

arduino-mk/Arduino.mk

@@ -714,19 +714,19 @@ TARGETS    = $(OBJDIR)/$(TARGET).*
 CORE_LIB   = $(OBJDIR)/libcore.a
 
 # Names of executables
-CC      ?= $(AVR_TOOLS_PATH)/$(CC_NAME)
-CXX     ?= $(AVR_TOOLS_PATH)/$(CXX_NAME)
-AS      ?= $(AVR_TOOLS_PATH)/$(AS_NAME)
-OBJCOPY ?= $(AVR_TOOLS_PATH)/$(OBJCOPY_NAME)
-OBJDUMP ?= $(AVR_TOOLS_PATH)/$(OBJDUMP_NAME)
-AR      ?= $(AVR_TOOLS_PATH)/$(AR_NAME)
-SIZE    ?= $(AVR_TOOLS_PATH)/$(SIZE_NAME)
-NM      ?= $(AVR_TOOLS_PATH)/$(NM_NAME)
-REMOVE  ?= rm -rf
-MV      ?= mv -f
-CAT     ?= cat
-ECHO    ?= echo
-MKDIR   ?= mkdir -p
+CC      = $(AVR_TOOLS_PATH)/$(CC_NAME)
+CXX     = $(AVR_TOOLS_PATH)/$(CXX_NAME)
+AS      = $(AVR_TOOLS_PATH)/$(AS_NAME)
+OBJCOPY = $(AVR_TOOLS_PATH)/$(OBJCOPY_NAME)
+OBJDUMP = $(AVR_TOOLS_PATH)/$(OBJDUMP_NAME)
+AR      = $(AVR_TOOLS_PATH)/$(AR_NAME)
+SIZE    = $(AVR_TOOLS_PATH)/$(SIZE_NAME)
+NM      = $(AVR_TOOLS_PATH)/$(NM_NAME)
+REMOVE  = rm -rf
+MV      = mv -f
+CAT     = cat
+ECHO    = echo
+MKDIR   = mkdir -p
 
 # General arguments
 USER_LIBS      = $(wildcard $(patsubst %,$(USER_LIB_PATH)/%,$(ARDUINO_LIBS)))