Added the TOOL_PREFIX variable for setting up the executable tools.

Currently three different tool chains seem to be used:
   * avr-*
   * pic32-*
   * arm-none-eabi-*

These all get set up independently. This patch centralizes the
definitions of the executable tools and does it generically, by means
of the newly introduced TOOL_PREFIX variable. Setting up a
tool chain is now simply a matter of defining the TOOL_PREFIX
variable. For the currently supported tool chains it gets set to avr,
pic32 or arm-none-eabi. Arbitrary tool chains can now easily be set up,
by the TOOL_PREFIX variable.

Although the use of the OVERRIDE_EXECUTABLES variable is now almost
not justifiable, it was left as-is, in order to assure backwards
compatibility.

Arduino.mk

@@ -388,28 +388,80 @@ endif
 ########################################################################
 # Arduino and system paths
 
+ifndef TOOL_PREFIX
+    TOOL_PREFIX = avr
+endif
+
 ifndef CC_NAME
-CC_NAME      = avr-gcc
+    CC_NAME := $(call PARSE_BOARD,$(BOARD_TAG),build.command.gcc)
+    ifndef CC_NAME
+        CC_NAME := $(TOOL_PREFIX)-gcc
+    else
+        $(call show_config_variable,CC_NAME,[COMPUTED])
+    endif
 endif
 
 ifndef CXX_NAME
-CXX_NAME     = avr-g++
+    CXX_NAME := $(call PARSE_BOARD,$(BOARD_TAG),build.command.g++)
+    ifndef CXX_NAME
+        CXX_NAME := $(TOOL_PREFIX)-g++
+    else
+        $(call show_config_variable,CXX_NAME,[COMPUTED])
+    endif
+endif
+
+ifndef AS_NAME
+    AS_NAME := $(call PARSE_BOARD,$(BOARD_TAG),build.command.as)
+    ifndef AS_NAME
+        AS_NAME := $(TOOL_PREFIX)-as
+    else
+        $(call show_config_variable,AS_NAME,[COMPUTED])
+    endif
 endif
 
 ifndef OBJCOPY_NAME
-OBJCOPY_NAME = avr-objcopy
+    OBJCOPY_NAME := $(call PARSE_BOARD,$(BOARD_TAG),build.command.objcopy)
+    ifndef OBJCOPY_NAME
+        OBJCOPY_NAME := $(TOOL_PREFIX)-objcopy
+    else
+        $(call show_config_variable,OBJCOPY_NAME,[COMPUTED])
+    endif
 endif
 
 ifndef OBJDUMP_NAME
-OBJDUMP_NAME = avr-objdump
+    OBJDUMP_NAME := $(call PARSE_BOARD,$(BOARD_TAG),build.command.objdump)
+    ifndef OBJDUMP_NAME
+        OBJDUMP_NAME := $(TOOL_PREFIX)-objdump
+    else
+        $(call show_config_variable,OBJDUMP_NAME,[COMPUTED])
+    endif
+endif
+
+ifndef AR_NAME
+    AR_NAME := $(call PARSE_BOARD,$(BOARD_TAG),build.command.ar)
+    ifndef AR_NAME
+        AR_NAME := $(TOOL_PREFIX)-ar
+    else
+        $(call show_config_variable,AR_NAME,[COMPUTED])
+    endif
 endif
 
 ifndef SIZE_NAME
-SIZE_NAME    = avr-size
+    SIZE_NAME := $(call PARSE_BOARD,$(BOARD_TAG),build.command.size)
+    ifndef SIZE_NAME
+        SIZE_NAME := $(TOOL_PREFIX)-size
+    else
+        $(call show_config_variable,SIZE_NAME,[COMPUTED])
+    endif
 endif
 
 ifndef NM_NAME
-NM_NAME      = avr-nm
+    NM_NAME := $(call PARSE_BOARD,$(BOARD_TAG),build.command.nm)
+    ifndef NM_NAME
+        NM_NAME := $(TOOL_PREFIX)-nm
+    else
+        $(call show_config_variable,NM_NAME,[COMPUTED])
+    endif
 endif
 
 ifndef AVR_TOOLS_DIR
@@ -457,8 +509,8 @@ ifndef AVR_TOOLS_DIR
             AVR_TOOLS_DIR = $(SYSTEMPATH_AVR_TOOLS_DIR)
             $(call show_config_variable,AVR_TOOLS_DIR,[AUTODETECTED],(found in $$PATH))
         else
-            # One last attempt using avr-gcc in case using arm
-            SYSTEMPATH_AVR_TOOLS_DIR := $(call dir_if_exists,$(abspath $(dir $(shell which $(avr-gcc)))/..))
+            # One last attempt using $(TOOL_PREFIX)-gcc in case using arm
+            SYSTEMPATH_AVR_TOOLS_DIR := $(call dir_if_exists,$(abspath $(dir $(shell which $($(TOOL_PREFIX)-gcc)))/..))
             ifdef SYSTEMPATH_AVR_TOOLS_DIR
                 AVR_TOOLS_DIR = $(SYSTEMPATH_AVR_TOOLS_DIR)
                 $(call show_config_variable,AVR_TOOLS_DIR,[AUTODETECTED],(found in $$PATH))
@@ -483,8 +535,8 @@ else
 
 endif #ndef AVR_TOOLS_DIR
 
-ifndef AVR_TOOLS_PATH
-    AVR_TOOLS_PATH    = $(AVR_TOOLS_DIR)/bin
+ifndef TOOLS_PATH
+    TOOLS_PATH    = $(AVR_TOOLS_DIR)/bin
 endif
 
 ifndef ARDUINO_LIB_PATH
@@ -821,7 +873,7 @@ endif
 ifeq ($(strip $(NO_CORE)),)
     ifdef ARDUINO_CORE_PATH
         CORE_C_SRCS     = $(wildcard $(ARDUINO_CORE_PATH)/*.c)
-        CORE_C_SRCS    += $(wildcard $(ARDUINO_CORE_PATH)/avr-libc/*.c)
+        CORE_C_SRCS    += $(wildcard $(ARDUINO_CORE_PATH)/$(TOOL_PREFIX)-libc/*.c)
         CORE_CPP_SRCS   = $(wildcard $(ARDUINO_CORE_PATH)/*.cpp)
         CORE_AS_SRCS    = $(wildcard $(ARDUINO_CORE_PATH)/*.S)
 
@@ -931,18 +983,22 @@ TARGET_EEP = $(OBJDIR)/$(TARGET).eep
 TARGET_BIN = $(OBJDIR)/$(TARGET).bin
 CORE_LIB   = $(OBJDIR)/libcore.a
 
-# Names of executables - chipKIT needs to override all to set paths to PIC32
-# tools, and we can't use "?=" assignment because these are already implicitly
+# Names of executables
+# In the rare case of wanting to override a path and/or excecutable
+# name, the OVERRIDE_EXECUTABLES variable must be defned and _all_
+# the excecutables (CC, CXX, AS, OBJCOPY, OBJDUMP AR, SIZE and NM)
+# _must_ be defined in the calling makefile.
+# We can't use "?=" assignment because these are already implicitly
 # defined by Make (e.g. $(CC) == cc).
 ifndef OVERRIDE_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)
+    CC      = $(TOOLS_PATH)/$(CC_NAME)
+    CXX     = $(TOOLS_PATH)/$(CXX_NAME)
+    AS      = $(TOOLS_PATH)/$(AS_NAME)
+    OBJCOPY = $(TOOLS_PATH)/$(OBJCOPY_NAME)
+    OBJDUMP = $(TOOLS_PATH)/$(OBJDUMP_NAME)
+    AR      = $(TOOLS_PATH)/$(AR_NAME)
+    SIZE    = $(TOOLS_PATH)/$(SIZE_NAME)
+    NM      = $(TOOLS_PATH)/$(NM_NAME)
 endif
 
 REMOVE  = rm -rf
@@ -1078,15 +1134,15 @@ ifneq ($(CATERINA),)
     CPPFLAGS += -DUSB_VID=$(USB_VID) -DUSB_PID=$(USB_PID)
 endif
 
-# avr-gcc version that we can do maths on
+# $(TOOL_PREFIX)-gcc version that we can do maths on
 CC_VERNUM = $(shell $(CC) -dumpversion | sed 's/\.//g')
 
 # moved from above so we can find version-dependant ar
-ifndef AR_NAME
+ifeq ($(TOOL_PREFIX), avr)
     ifeq ($(shell expr $(CC_VERNUM) '>' 490), 1)
-        AR_NAME      = avr-gcc-ar
+        AR_NAME      := $(TOOL_PREFIX)-gcc-ar
     else
-        AR_NAME      = avr-ar
+        AR_NAME      := $(TOOL_PREFIX)-ar
     endif
 endif
 
@@ -1404,7 +1460,7 @@ CTAGS_CMD = $(CTAGS_EXEC) $(CTAGS_OPTS) -auf
 
 # If avrdude is installed separately, it can find its own config file
 ifndef AVRDUDE
-    AVRDUDE          = $(AVR_TOOLS_PATH)/avrdude
+    AVRDUDE          = $(TOOLS_PATH)/avrdude
 endif
 
 # Default avrdude options
@@ -1747,7 +1803,7 @@ help:
   make debug_init        - start openocd gdb server\n\
   make debug             - connect to gdb target and begin debugging\n\
   make size              - show the size of the compiled output (relative to\n\
-                           resources, if you have a patched avr-size).\n\
+                           resources, if you have a patched $(TOOL_PREFIX)-size).\n\
   make verify_size       - verify that the size of the final file is less than\n\
                            the capacity of the micro controller.\n\
   make symbol_sizes      - generate a .sym file containing symbols and their\n\

HISTORY.md

@@ -23,6 +23,7 @@ I tried to give credit whenever possible. If I have missed anyone, kindly add it
 - New: Support Arduino ARM SAMD devices (Zero, M0 Pro, Feather M0). (https://github.com/tuna-f1sh)
 - New: Support Arduino ARM SAM devices (Due). (https://github.com/tuna-f1sh)
 - New: Moved the PARSE_BOARD macro to Common.mk and use only this to parse the boards.txt file. (https://github.com/wingunder)
+- New: Added the TOOL_PREFIX variable for setting up the executable tools centrally and generically. (https://github.com/wingunder)
 
 ### 1.6.0 (2017-07-11)
 - Fix: Allowed for SparkFun's weird usb pid/vid submenu shenanigans (issue #499). (https://github.com/sej7278)

OpenCM.mk

@@ -69,77 +69,7 @@ endif
 ########################################################################
 # command names
 
-ifndef CC_NAME
-    CC_NAME := $(call PARSE_BOARD,$(BOARD_TAG),build.command.gcc)
-    ifndef CC_NAME
-        CC_NAME := arm-none-eabi-gcc
-    else
-        $(call show_config_variable,CC_NAME,[COMPUTED])
-    endif
-endif
-
-ifndef CXX_NAME
-    CXX_NAME := $(call PARSE_BOARD,$(BOARD_TAG),build.command.g++)
-    ifndef CXX_NAME
-        CXX_NAME := arm-none-eabi-g++
-    else
-        $(call show_config_variable,CXX_NAME,[COMPUTED])
-    endif
-endif
-
-ifndef AS_NAME
-    AS_NAME := $(call PARSE_BOARD,$(BOARD_TAG),build.command.as)
-    ifndef AS_NAME
-        AS_NAME := arm-none-eabi-as
-    else
-        $(call show_config_variable,AS_NAME,[COMPUTED])
-    endif
-endif
-
-ifndef OBJDUMP_NAME
-    OBJDUMP_NAME := $(call PARSE_BOARD,$(BOARD_TAG),build.command.objdump)
-    ifndef OBJDUMP_NAME
-        OBJDUMP_NAME := arm-none-eabi-objdump
-    else
-        $(call show_config_variable,OBJDUMP_NAME,[COMPUTED])
-    endif
-endif
-
-ifndef AR_NAME
-    AR_NAME := $(call PARSE_BOARD,$(BOARD_TAG),build.command.ar)
-    ifndef AR_NAME
-        AR_NAME := arm-none-eabi-ar
-    else
-        $(call show_config_variable,AR_NAME,[COMPUTED])
-    endif
-endif
-
-ifndef SIZE_NAME
-    SIZE_NAME := $(call PARSE_BOARD,$(BOARD_TAG),build.command.size)
-    ifndef SIZE_NAME
-        SIZE_NAME := arm-none-eabi-size
-    else
-        $(call show_config_variable,SIZE_NAME,[COMPUTED])
-    endif
-endif
-
-ifndef NM_NAME
-    NM_NAME := $(call PARSE_BOARD,$(BOARD_TAG),build.command.nm)
-    ifndef NM_NAME
-        NM_NAME := arm-none-eabi-nm
-    else
-        $(call show_config_variable,NM_NAME,[COMPUTED])
-    endif
-endif
-
-ifndef OBJCOPY_NAME
-    OBJCOPY_NAME := $(call PARSE_BOARD,$(BOARD_TAG),build.command.objcopy)
-    ifndef OBJCOPY_NAME
-        OBJCOPY_NAME := arm-none-eabi-objcopy
-    else
-        $(call show_config_variable,OBJCOPY_NAME,[COMPUTED])
-    endif
-endif
+TOOL_PREFIX = arm-none-eabi
 
 # processor stuff
 ifndef MCU

Sam.mk

@@ -167,7 +167,7 @@ endif
 
 # Use arm-toolchain from Arduino install if exists and user has not defined global version
 ifndef ARM_TOOLS_DIR
-    ARM_TOOLS_DIR = $(call dir_if_exists,$(wildcard $(ARDUINO_PACKAGE_DIR)/$(ARDMK_VENDOR)/tools/arm-none-eabi-gcc/*))
+    ARM_TOOLS_DIR = $(call dir_if_exists,$(wildcard $(ARDUINO_PACKAGE_DIR)/$(ARDMK_VENDOR)/tools/$(TOOL_PREFIX)-gcc/*))
     $(call show_config_variable,ARM_TOOLS_DIR,[COMPUTED],(from ARDUINO_PACKAGE_DIR))
 else
     $(call show_config_variable,ARM_TOOLS_DIR,[USER])
@@ -182,82 +182,12 @@ endif
 ########################################################################
 # command names
 
-ifndef CC_NAME
-    CC_NAME := $(call PARSE_BOARD,$(BOARD_TAG),build.command.gcc)
-    ifndef CC_NAME
-        CC_NAME := arm-none-eabi-gcc
-    else
-        $(call show_config_variable,CC_NAME,[COMPUTED])
-    endif
-endif
-
-ifndef CXX_NAME
-    CXX_NAME := $(call PARSE_BOARD,$(BOARD_TAG),build.command.g\+\+)
-    ifndef CXX_NAME
-        CXX_NAME := arm-none-eabi-g++
-    else
-        $(call show_config_variable,CXX_NAME,[COMPUTED])
-    endif
-endif
-
-ifndef AS_NAME
-    AS_NAME := $(call PARSE_BOARD,$(BOARD_TAG),build.command.as)
-    ifndef AS_NAME
-        AS_NAME := arm-none-eabi-gcc-as
-    else
-        $(call show_config_variable,AS_NAME,[COMPUTED])
-    endif
-endif
-
-ifndef OBJCOPY_NAME
-    OBJCOPY_NAME := $(call PARSE_BOARD,$(BOARD_TAG),build.command.objcopy)
-    ifndef OBJCOPY_NAME
-        OBJCOPY_NAME := arm-none-eabi-objcopy
-    else
-        $(call show_config_variable,OBJCOPY_NAME,[COMPUTED])
-    endif
-endif
-
-ifndef OBJDUMP_NAME
-    OBJDUMP_NAME := $(call PARSE_BOARD,$(BOARD_TAG),build.command.objdump)
-    ifndef OBJDUMP_NAME
-        OBJDUMP_NAME := arm-none-eabi-objdump
-    else
-        $(call show_config_variable,OBJDUMP_NAME,[COMPUTED])
-    endif
-endif
-
-ifndef AR_NAME
-    AR_NAME := $(call PARSE_BOARD,$(BOARD_TAG),build.command.ar)
-    ifndef AR_NAME
-        AR_NAME := arm-none-eabi-ar
-    else
-        $(call show_config_variable,AR_NAME,[COMPUTED])
-    endif
-endif
-
-ifndef SIZE_NAME
-    SIZE_NAME := $(call PARSE_BOARD,$(BOARD_TAG),build.command.size)
-    ifndef SIZE_NAME
-        SIZE_NAME := arm-none-eabi-size
-    else
-        $(call show_config_variable,SIZE_NAME,[COMPUTED])
-    endif
-endif
-
-ifndef NM_NAME
-    NM_NAME := $(call PARSE_BOARD,$(BOARD_TAG),build.command.nm)
-    ifndef NM_NAME
-        NM_NAME := arm-none-eabi-gcc-nm
-    else
-        $(call show_config_variable,NM_NAME,[COMPUTED])
-    endif
-endif
+TOOL_PREFIX = arm-none-eabi
 
 ifndef GDB_NAME
     GDB_NAME := $(call PARSE_BOARD,$(BOARD_TAG),build.command.gdb)
     ifndef GDB_NAME
-        GDB_NAME := arm-none-eabi-gdb
+        GDB_NAME := $(TOOL_PREFIX)-gdb
     else
         $(call show_config_variable,GDB_NAME,[COMPUTED])
     endif
@@ -385,17 +315,8 @@ endif
 ########################################################################
 # EXECUTABLES
 # Define them here to use ARM_TOOLS_PATH and allow auto finding of AVR_TOOLS_PATH
-OVERRIDE_EXECUTABLES = 1
-
-ARM_TOOLS_PATH := $(ARM_TOOLS_DIR)/bin
-CC      = $(ARM_TOOLS_PATH)/$(CC_NAME)
-CXX     = $(ARM_TOOLS_PATH)/$(CXX_NAME)
-AS      = $(ARM_TOOLS_PATH)/$(AS_NAME)
-OBJCOPY = $(ARM_TOOLS_PATH)/$(OBJCOPY_NAME)
-OBJDUMP = $(ARM_TOOLS_PATH)/$(OBJDUMP_NAME)
-AR      = $(ARM_TOOLS_PATH)/$(AR_NAME)
-SIZE    = $(ARM_TOOLS_PATH)/$(SIZE_NAME)
-NM      = $(ARM_TOOLS_PATH)/$(NM_NAME)
+
+AVR_TOOLS_DIR := $(ARM_TOOLS_DIR)
 #GDB     = $(ARM_TOOLS_PATH)/$(GDB_NAME)
 # Use system gdb for now as Arduino supplied has lib error?
 GDB     = $(GDB_NAME)