view Makefile @ 1512:7afd32673a5c draft 0.5.0

Workaround for musl's faccessat bug (the rm -r "error: is a directory" thing). The Linux man page says I can use AT_SYMLINK_NOFOLLOW. It works in glibc, uclibc, and klibc, but musl returns -EINVAL any time you pass in that flag and the maintainer says that's not a bug and insists the man page and those other libraries all change to match musl's behavior. Toybox uses it to avoid scheduling unnecessary metadata writes for things we're about to delete (have to chmod unreadable directories so we can descend into them to delete their contents, the chmod happens before we descend so the disk I/O has plenty of time to be scheduled) because the extra writes wear out SSD faster. It's just an optimization and I don't really care if it works _well_ (the fchmodat call _also_ takes AT_SYMLINK_NOFOLLOW so that's covered), but musl's behavior uniquely makes the check always error and thus breaks normal "rm -r". Yes this workaround is checking #ifdef __MUSL__ which the library does not supply (because its code is perfect and will thus never need to be worked around). You can CFLAGS=-D__MUSL__ if you don't echo "#define __MUSL__" >> include/features.h when installing the library.
author Rob Landley <rob@landley.net>
date Thu, 02 Oct 2014 07:24:38 -0500
parents 8bf5f528d352
children a34104fc7544
line wrap: on
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# Makefile for toybox.
# Copyright 2006 Rob Landley <rob@landley.net>

all: toybox

KCONFIG_CONFIG ?= .config
toybox toybox_unstripped: $(KCONFIG_CONFIG) *.[ch] lib/*.[ch] toys/*.h toys/*/*.c scripts/*.sh
	scripts/make.sh

.PHONY: clean distclean baseline bloatcheck install install_flat \
	uinstall uninstall_flat test tests help

include kconfig/Makefile

$(KCONFIG_TOP): generated/Config.in
generated/Config.in: toys/*/*.c scripts/genconfig.sh
	scripts/genconfig.sh

HOSTCC?=cc

# Development targets
baseline: toybox_unstripped
	@cp toybox_unstripped toybox_old

bloatcheck: toybox_old toybox_unstripped
	@scripts/bloatcheck toybox_old toybox_unstripped

generated/instlist: toybox
	$(HOSTCC) -I . scripts/install.c -o generated/instlist

install_flat: generated/instlist
	scripts/install.sh --symlink --force

install:
	scripts/install.sh --long --symlink --force

uninstall_flat: generated/instlist
	scripts/install.sh --uninstall

uninstall:
	scripts/install.sh --long --uninstall

clean::
	rm -rf toybox toybox_unstripped generated .singleconfig*

distclean: clean
	rm -f toybox_old .config*

test: tests

tests:
	scripts/test.sh

help::
	@echo  '  toybox          - Build toybox.'
	@echo  '  baseline        - Create busybox_old for use by bloatcheck.'
	@echo  '  bloatcheck      - Report size differences between old and current versions'
	@echo  '  test            - Run test suite against compiled commands.'
	@echo  '  clean           - Delete temporary files.'
	@echo  "  distclean       - Delete everything that isn't shipped."
	@echo  '  install_flat    - Install toybox into $$PREFIX directory.'
	@echo  '  install         - Install toybox into subdirectories of $$PREFIX.'
	@echo  '  uninstall_flat  - Remove toybox from $$PREFIX directory.'
	@echo  '  uninstall       - Remove toybox from subdirectories of $$PREFIX.'
	@echo  ''
	@echo  'example: CFLAGS="--static" CROSS_COMPILE=armv5l- make defconfig toybox install'
	@echo  ''