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busybox/scripts/Makefile.IMA
Jean-Philippe Brucker ed8af51b60 build system: remove KBUILD_STR() 
When using GNU Make >=4.3, the KBUILD_STR() definition interferes badly
with dependency checks during build, and forces a complete rebuild every
time Make runs.

In if_changed_rule, Kconfig checks if the command used to build a file
has changed since last execution. The previous command is stored in the
generated .<file>.o.cmd file. For example applets/.applets.o.cmd defines
a "cmd_applets/applets.o" variable:

	cmd_applets/applets.o := gcc ... -D"KBUILD_STR(s)=#s" ...

Here the '#' should be escaped with a backslash, otherwise GNU Make
interprets it as starting a comment, and ignore the rest of the
variable. As a result of this truncation, the previous command doesn't
equal the new command and Make rebuilds each target.

The problem started to appear when GNU Make 4.3 (released January 2020),
introduced a backward-incompatible fix to macros containing a '#'. While
the above use of '#', a simple Make variable, still needs to be escaped,
a '#' within a function invocation doesn't need to be escaped anymore.
As Martin Dorey explained on the GNU Make discussion [1], the above
declaration is generated from make-cmd, defined as:

	make-cmd = $(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1))))

Since GNU Make 4.3, the first argument of subst should not have a
backslash. make-cmd now looks for literally \# and doesn't find it, and
as a result doesn't add the backslash when generating .o.cmd files.

[1] http://savannah.gnu.org/bugs/?20513

We could fix it by changing make-cmd to "$(subst #,\#,...)", but to
avoid compatibility headaches, simply get rid of the KBUILD_STR
definition, as done in Linux by b42841b7bb62 ("kbuild: Get rid of
KBUILD_STR"). Quote the string arguments directly rather than asking the
preprocessor to quote them.

Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-04-29 14:52:19 +02:00

211 lines
6.2 KiB
Makefile
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# This is completely unsupported.
#
# Uasge: make -f scripts/Makefile.IMA
#
# Fix COMBINED_COMPILE upstream (in the Kbuild) and propagate
# the changes back
srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
objtree := $(CURDIR)
src := $(srctree)
obj := $(objtree)
# Make generated files
DUMMY := $(shell $(Q)$(srctree)/scripts/gen_build_files.sh $(srctree) $(objtree) >&2)
# Look for make include files relative to root of src
MAKEFLAGS += --include-dir=$(srctree)
default: busybox
include .config
# Cross compiling and selecting different set of gcc/bin-utils
ifeq ($(CROSS_COMPILE),)
CROSS_COMPILE := $(subst ",,$(CONFIG_CROSS_COMPILER_PREFIX))
endif
ifneq ($(CROSS_COMPILE),)
SUBARCH := $(shell echo $(CROSS_COMPILE) | cut -d- -f1)
else
SUBARCH := $(shell uname -m)
endif
SUBARCH := $(shell echo $(SUBARCH) | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
-e s/arm.*/arm/ -e s/sa110/arm/ \
-e s/s390x/s390/ -e s/parisc64/parisc/ \
-e s/ppc.*/powerpc/ -e s/mips.*/mips/ )
ARCH ?= $(SUBARCH)
ifndef HOSTCC
HOSTCC = cc
endif
AS = $(CROSS_COMPILE)as
CC = $(CROSS_COMPILE)gcc
LD = $(CC) -nostdlib
CPP = $(CC) -E
AR = $(CROSS_COMPILE)ar
NM = $(CROSS_COMPILE)nm
STRIP = $(CROSS_COMPILE)strip
OBJCOPY = $(CROSS_COMPILE)objcopy
OBJDUMP = $(CROSS_COMPILE)objdump
CFLAGS := $(CFLAGS)
# We need some generic definitions
include $(srctree)/scripts/Kbuild.include
include Makefile.flags
-include $(srctree)/arch/$(ARCH)/Makefile
ifdef CONFIG_FEATURE_COMPRESS_USAGE
usage_stuff = include/usage_compressed.h
endif
ifndef BB_VER
BB_VER:=""
endif
WHOLE_PROGRAM:=$(call cc-option,-fwhole-program,)
# pull in the config stuff
lib-all-y := applets/applets.o
lib-y:=
include procps/Kbuild
lib-all-y += $(patsubst %,procps/%,$(sort $(lib-y)))
lib-y:=
include networking/Kbuild
lib-all-y += $(patsubst %,networking/%,$(sort $(lib-y)))
lib-y:=
include networking/udhcp/Kbuild
lib-all-y += $(patsubst %,networking/udhcp/%,$(sort $(lib-y)))
lib-y:=
include networking/libiproute/Kbuild
lib-all-y += $(patsubst %,networking/libiproute/%,$(sort $(lib-y)))
lib-y:=
include loginutils/Kbuild
lib-all-y += $(patsubst %,loginutils/%,$(sort $(lib-y)))
lib-y:=
include archival/Kbuild
lib-all-y += $(patsubst %,archival/%,$(sort $(lib-y)))
lib-y:=
include archival/libarchive/Kbuild
lib-all-y += $(patsubst %,archival/libarchive/%,$(sort $(lib-y)))
lib-y:=
include applets/Kbuild
lib-all-y += $(patsubst %,applets/%,$(sort $(lib-y)))
lib-y:=
include e2fsprogs/Kbuild
lib-all-y += $(patsubst %,e2fsprogs/%,$(sort $(lib-y)))
lib-y:=
#include e2fsprogs/old_e2fsprogs/Kbuild
#lib-all-y += $(patsubst %,e2fsprogs/old_e2fsprogs/%,$(sort $(lib-y)))
#lib-y:=
#include e2fsprogs/old_e2fsprogs/ext2fs/Kbuild
#lib-all-y += $(patsubst %,e2fsprogs/old_e2fsprogs/ext2fs/%,$(sort $(lib-y)))
#lib-y:=
#include e2fsprogs/old_e2fsprogs/blkid/Kbuild
#lib-all-y += $(patsubst %,e2fsprogs/old_e2fsprogs/blkid/%,$(sort $(lib-y)))
#lib-y:=
#include e2fsprogs/old_e2fsprogs/uuid/Kbuild
#lib-all-y += $(patsubst %,e2fsprogs/old_e2fsprogs/uuid/%,$(sort $(lib-y)))
#lib-y:=
#include e2fsprogs/old_e2fsprogs/e2p/Kbuild
#lib-all-y += $(patsubst %,e2fsprogs/old_e2fsprogs/e2p/%,$(sort $(lib-y)))
#lib-y:=
include debianutils/Kbuild
lib-all-y += $(patsubst %,debianutils/%,$(sort $(lib-y)))
lib-y:=
include klibc-utils/Kbuild
lib-all-y += $(patsubst %,klibc-utils/%,$(sort $(lib-y)))
lib-y:=
include runit/Kbuild
lib-all-y += $(patsubst %,runit/%,$(sort $(lib-y)))
lib-y:=
include modutils/Kbuild
lib-all-y += $(patsubst %,modutils/%,$(sort $(lib-y)))
lib-y:=
include miscutils/Kbuild
lib-all-y += $(patsubst %,miscutils/%,$(sort $(lib-y)))
lib-y:=
include mailutils/Kbuild
lib-all-y += $(patsubst %,mailutils/%,$(sort $(lib-y)))
lib-y:=
include coreutils/libcoreutils/Kbuild
lib-all-y += $(patsubst %,coreutils/libcoreutils/%,$(sort $(lib-y)))
lib-y:=
include coreutils/Kbuild
lib-all-y += $(patsubst %,coreutils/%,$(sort $(lib-y)))
lib-y:=
include sysklogd/Kbuild
lib-all-y += $(patsubst %,sysklogd/%,$(sort $(lib-y)))
lib-y:=
include shell/Kbuild
lib-all-y += $(patsubst %,shell/%,$(sort $(lib-y)))
lib-y:=
include console-tools/Kbuild
lib-all-y += $(patsubst %,console-tools/%,$(sort $(lib-y)))
lib-y:=
include findutils/Kbuild
lib-all-y += $(patsubst %,findutils/%,$(sort $(lib-y)))
lib-y:=
include util-linux/Kbuild
lib-all-y += $(patsubst %,util-linux/%,$(sort $(lib-y)))
lib-y:=
include util-linux/volume_id/Kbuild
lib-all-y += $(patsubst %,util-linux/volume_id/%,$(sort $(lib-y)))
lib-y:=
include init/Kbuild
lib-all-y += $(patsubst %,init/%,$(sort $(lib-y)))
lib-y:=
include libpwdgrp/Kbuild
lib-all-y += $(patsubst %,libpwdgrp/%,$(sort $(lib-y)))
lib-y:=
include editors/Kbuild
lib-all-y += $(patsubst %,editors/%,$(sort $(lib-y)))
lib-y:=
include printutils/Kbuild
lib-all-y += $(patsubst %,printutils/%,$(sort $(lib-y)))
lib-y:=
include selinux/Kbuild
lib-all-y += $(patsubst %,selinux/%,$(sort $(lib-y)))
lib-y:=
include scripts/Kbuild
lib-all-y += $(patsubst %,scripts/%,$(sort $(lib-y)))
lib-y:=
include libbb/Kbuild
lib-all-y += $(patsubst %,libbb/%,$(sort $(lib-y)))
lib-y:=
comma:=,
busybox_unstripped.o: $(usage_stuff) include/applet_tables.h include/NUM_APPLETS.h include/autoconf.h
$(CC) $(CPPFLAGS) $(CFLAGS) $(EXTRA_CFLAGS) \
$(patsubst %,-Wl$(comma)%,$(LDFLAGS) $(EXTRA_LDFLAGS)) \
-DGCC_COMBINE=1 \
--combine $(WHOLE_PROGRAM) \
-funit-at-a-time -Wno-error -std=gnu99 \
-c -o busybox_unstripped.o \
$(lib-all-y:.o=.c)
busybox: busybox_unstripped.o
$(srctree)/scripts/trylink \
busybox_unstripped \
"$(CC) $(CFLAGS_busybox)" \
"$(CFLAGS)" \
"$(LDFLAGS)" \
"busybox_unstripped.o" \
"" \
"crypt m"
cp -f $(@)_unstripped $@
-$(STRIP) -s -R .note -R .comment -R .version $@
# If .config is newer than include/autoconf.h, someone tinkered
# with it and forgot to run make oldconfig.
include/autoconf.h: .config
$(MAKE) -f $(srctree)/Makefile silentoldconfig
# Override rules for host compile
applets/usage: include/autoconf.h
$(HOSTCC) -Wall -O2 -I$(srctree)/include -o applets/usage applets/usage.c
applets/applet_tables: include/autoconf.h
$(HOSTCC) -Wall -O2 -I$(srctree)/include -o applets/applet_tables applets/applet_tables.c
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