integrate top.mk into make.mk

1 files changed, 69 insertions, 41 deletions

diff --git a/examples/make.mk b/examples/make.mk
index e02d226b6..d91263db9 100644
--- a/examples/make.mk
+++ b/examples/make.mk
@@ -2,57 +2,38 @@
 # Common make definition for all examples
 # ---------------------------------------
 
-# Build directory
-BUILD := _build/$(BOARD)
-
-PROJECT := $(notdir $(CURDIR))
-BIN := $(TOP)/_bin/$(BOARD)/$(notdir $(CURDIR))
-
-# 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))))
+#-------------- TOP and CURRENT_PATH ------------
 
-#-------------- Select the board to build for. ------------
+# Set TOP to be the path to get from the current directory (where make was
+# invoked) to the top of the tree. $(lastword $(MAKEFILE_LIST)) returns
+# the name of this makefile relative to where make was invoked.
+THIS_MAKEFILE := $(lastword $(MAKEFILE_LIST))
 
-# Board without family
-ifneq ($(wildcard $(TOP)/hw/bsp/$(BOARD)/board.mk),)
-BOARD_PATH := hw/bsp/$(BOARD)
-FAMILY :=
-endif
-
-# Board within family
-ifeq ($(BOARD_PATH),)
-  BOARD_PATH := $(subst $(TOP)/,,$(wildcard $(TOP)/hw/bsp/*/boards/$(BOARD)))
-  FAMILY := $(word 3, $(subst /, ,$(BOARD_PATH)))
-  FAMILY_PATH = hw/bsp/$(FAMILY)
-endif
+# strip off /tools/top.mk to get for example ../../..
+# and Set TOP to an absolute path
+TOP = $(abspath $(subst make.mk,..,$(THIS_MAKEFILE)))
 
-ifeq ($(BOARD_PATH),)
-  $(info You must provide a BOARD parameter with 'BOARD=')
-  $(error Invalid BOARD specified)
-endif
+# Set CURRENT_PATH to the relative path from TOP to the current directory, ie examples/device/cdc_msc_freertos
+CURRENT_PATH = $(subst $(TOP)/,,$(abspath .))
 
-ifeq ($(FAMILY),)
-  include $(TOP)/hw/bsp/$(BOARD)/board.mk
-else
-  # Include Family and Board specific defs
-  include $(TOP)/$(FAMILY_PATH)/family.mk
+# Detect whether shell style is windows or not
+# https://stackoverflow.com/questions/714100/os-detecting-makefile/52062069#52062069
+ifeq '$(findstring ;,$(PATH))' ';'
+# PATH contains semicolon - so we're definitely on Windows.
+CMDEXE := 1
 
-  SRC_C += $(subst $(TOP)/,,$(wildcard $(TOP)/$(FAMILY_PATH)/*.c))
+# makefile shell commands should use syntax for DOS CMD, not unix sh
+# Unfortunately, SHELL may point to sh or bash, which can't accept DOS syntax.
+# We can't just use sh, because while sh and/or bash shell may be available,
+# many Windows environments won't have utilities like realpath used below, so...
+# Force DOS command shell on Windows.
+SHELL := cmd.exe
 endif
 
-
 #-------------- Cross Compiler  ------------
 # Can be set by board, default to ARM GCC
 CROSS_COMPILE ?= arm-none-eabi-
 
-# Allow for -Os to be changed by board makefiles in case -Os is not allowed
-CFLAGS_OPTIMIZED ?= -Os
-
 ifeq ($(CC),iccarm)
 USE_IAR = 1
 endif
@@ -68,7 +49,7 @@ else
   CXX = $(CROSS_COMPILE)g++
   AS = $(CC) -x assembler-with-cpp
   LD = $(CC)
-  
+
   GDB = $(CROSS_COMPILE)gdb
   OBJCOPY = $(CROSS_COMPILE)objcopy
   SIZE = $(CROSS_COMPILE)size
@@ -86,6 +67,50 @@ else
   PYTHON = python3
 endif
 
+
+# Build directory
+BUILD := _build/$(BOARD)
+
+PROJECT := $(notdir $(CURDIR))
+BIN := $(TOP)/_bin/$(BOARD)/$(notdir $(CURDIR))
+
+# 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, ($2))))
+
+#-------------- Select the board to build for. ------------
+
+# Board without family
+ifneq ($(wildcard $(TOP)/hw/bsp/$(BOARD)/board.mk),)
+BOARD_PATH := hw/bsp/$(BOARD)
+FAMILY :=
+endif
+
+# Board within family
+ifeq ($(BOARD_PATH),)
+  BOARD_PATH := $(subst $(TOP)/,,$(wildcard $(TOP)/hw/bsp/*/boards/$(BOARD)))
+  FAMILY := $(word 3, $(subst /, ,$(BOARD_PATH)))
+  FAMILY_PATH = hw/bsp/$(FAMILY)
+endif
+
+ifeq ($(BOARD_PATH),)
+  $(info You must provide a BOARD parameter with 'BOARD=')
+  $(error Invalid BOARD specified)
+endif
+
+ifeq ($(FAMILY),)
+  include $(TOP)/hw/bsp/$(BOARD)/board.mk
+else
+  # Include Family and Board specific defs
+  include $(TOP)/$(FAMILY_PATH)/family.mk
+
+  SRC_C += $(subst $(TOP)/,,$(wildcard $(TOP)/$(FAMILY_PATH)/*.c))
+endif
+
 #-------------- Source files and compiler flags --------------
 
 # Include all source C in family & board folder
@@ -94,6 +119,9 @@ SRC_C += $(subst $(TOP)/,,$(wildcard $(TOP)/$(BOARD_PATH)/*.c))
 
 INC   += $(TOP)/$(FAMILY_PATH)
 
+# Allow for -Os to be changed by board makefiles in case -Os is not allowed
+CFLAGS_OPTIMIZED ?= -Os
+
 # GCC Compiler Flags
 GCC_CFLAGS += \
   -ggdb \