78718fffb1
Commit 4173950658 removed automatic building
of mpy-cross, which rebuilt it whenever any of its dependent source files
changed.
But needing to build mpy-cross, and not knowing how, is a frequent issue.
This commit aims to help by automatically building mpy-cross only if it
doesn't exist. For Makefiles it uses an order-only prerequisite, while
for CMake it uses a custom command.
If MICROPY_MPYCROSS (which is what makemanifest.py uses to locate the
mpy-cross executable) is defined in the environment then automatic build
will not be attempted, allowing a way to prevent this auto-build if needed.
Thanks to Trammell Hudson aka @osresearch for the original idea; see #5760.
Signed-off-by: Damien George <damien@micropython.org>
73 lines
1.7 KiB
Makefile
73 lines
1.7 KiB
Makefile
ifneq ($(lastword a b),b)
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$(error These Makefiles require make 3.81 or newer)
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endif
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# Set TOP to be the path to get from the current directory (where make was
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# invoked) to the top of the tree. $(lastword $(MAKEFILE_LIST)) returns
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# the name of this makefile relative to where make was invoked.
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#
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# We assume that this file is in the py directory so we use $(dir ) twice
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# to get to the top of the tree.
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THIS_MAKEFILE := $(lastword $(MAKEFILE_LIST))
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TOP := $(patsubst %/py/mkenv.mk,%,$(THIS_MAKEFILE))
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# Turn on increased build verbosity by defining BUILD_VERBOSE in your main
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# Makefile or in your environment. You can also use V=1 on the make command
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# line.
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ifeq ("$(origin V)", "command line")
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BUILD_VERBOSE=$(V)
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endif
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ifndef BUILD_VERBOSE
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$(info Use make V=1 or set BUILD_VERBOSE in your environment to increase build verbosity.)
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BUILD_VERBOSE = 0
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endif
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ifeq ($(BUILD_VERBOSE),0)
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Q = @
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else
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Q =
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endif
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# default settings; can be overridden in main Makefile
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PY_SRC ?= $(TOP)/py
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BUILD ?= build
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RM = rm
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ECHO = @echo
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CP = cp
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MKDIR = mkdir
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SED = sed
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CAT = cat
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TOUCH = touch
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PYTHON = python3
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AS = $(CROSS_COMPILE)as
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CC = $(CROSS_COMPILE)gcc
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CXX = $(CROSS_COMPILE)g++
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GDB = $(CROSS_COMPILE)gdb
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LD = $(CROSS_COMPILE)ld
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OBJCOPY = $(CROSS_COMPILE)objcopy
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SIZE = $(CROSS_COMPILE)size
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STRIP = $(CROSS_COMPILE)strip
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AR = $(CROSS_COMPILE)ar
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MAKE_MANIFEST = $(PYTHON) $(TOP)/tools/makemanifest.py
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MAKE_FROZEN = $(PYTHON) $(TOP)/tools/make-frozen.py
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MPY_TOOL = $(PYTHON) $(TOP)/tools/mpy-tool.py
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MPY_LIB_DIR = $(TOP)/../micropython-lib
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ifeq ($(MICROPY_MPYCROSS),)
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MICROPY_MPYCROSS = $(TOP)/mpy-cross/mpy-cross
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MICROPY_MPYCROSS_DEPENDENCY = $(MICROPY_MPYCROSS)
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endif
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all:
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.PHONY: all
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.DELETE_ON_ERROR:
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MKENV_INCLUDED = 1
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