From d74a92bf4596d229a3176fab2f91c45eabff6d3a Mon Sep 17 00:00:00 2001
From: hathach <thach@tinyusb.org>
Date: Wed, 25 Mar 2020 14:06:51 +0700
Subject: makefile clean up

allow board to define CROSS_COMPILE (default to arm gcc)
---
 examples/make.mk | 65 +++++++++++++++++++++++---------------------------------
 1 file changed, 27 insertions(+), 38 deletions(-)

(limited to 'examples')

diff --git a/examples/make.mk b/examples/make.mk
index 25b618896..5fc596f63 100644
--- a/examples/make.mk
+++ b/examples/make.mk
@@ -1,56 +1,45 @@
-#
+# ---------------------------------------
 # Common make definition for all examples
-#
+# ---------------------------------------
 
-# Compiler
-ifeq ($(BOARD), msp_exp430f5529lp)
-  CROSS_COMPILE = msp430-elf-
-else ifeq ($(BOARD), fomu)
-  CROSS_COMPILE = riscv-none-embed-
-else
-  CROSS_COMPILE = arm-none-eabi-
+#-------------- Select the board to build for. ------------
+BOARD_LIST = $(sort $(subst /.,,$(subst $(TOP)/hw/bsp/,,$(wildcard $(TOP)/hw/bsp/*/.))))
+
+ifeq ($(filter $(BOARD),$(BOARD_LIST)),)
+  $(info You must provide a BOARD parameter with 'BOARD=', supported boards are:)
+  $(foreach b,$(BOARD_LIST),$(info - $(b)))
+  $(error Invalid BOARD specified)
 endif
-CC = $(CROSS_COMPILE)gcc
-CXX = $(CROSS_COMPILE)g++
-OBJCOPY = $(CROSS_COMPILE)objcopy
-SIZE = $(CROSS_COMPILE)size
-MKDIR = mkdir
-SED = sed
-CP = cp
-RM = rm
-PYTHON ?= python
 
+# Handy check parameter function
 check_defined = \
     $(strip $(foreach 1,$1, \
     $(call __check_defined,$1,$(strip $(value 2)))))
 __check_defined = \
     $(if $(value $1),, \
     $(error Undefined make flag: $1$(if $2, ($2))))
-
-
-define newline
-
-
-endef
-
-# Select the board to build for.
-ifeq ($(BOARD),)
-  $(info You must provide a BOARD parameter with 'BOARD=')
-  $(info Supported boards are:)
-  $(info $(sort $(subst /.,,$(subst $(TOP)/hw/bsp/, $(newline)-,$(wildcard $(TOP)/hw/bsp/*/.)))))
-  $(error BOARD not defined)
-else
-  ifeq ($(wildcard $(TOP)/hw/bsp/$(BOARD)/.),)
-    $(error Invalid BOARD specified)
-  endif
-endif
-
+    
 # Build directory
 BUILD = _build/build-$(BOARD)
 
-# Board specific
+# Board specific define
 include $(TOP)/hw/bsp/$(BOARD)/board.mk
 
+#-------------- Cross Compiler  ------------
+# Can be set by board, default to ARM GCC
+CROSS_COMPILE ?= arm-none-eabi-
+
+CC = $(CROSS_COMPILE)gcc
+CXX = $(CROSS_COMPILE)g++
+OBJCOPY = $(CROSS_COMPILE)objcopy
+SIZE = $(CROSS_COMPILE)size
+MKDIR = mkdir
+SED = sed
+CP = cp
+RM = rm
+
+#-------------- Source files and compiler flags --------------
+
 # Include all source C in board folder
 SRC_C += hw/bsp/board.c
 SRC_C += $(subst $(TOP)/,,$(wildcard $(TOP)/hw/bsp/$(BOARD)/*.c))
-- 
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