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busybox/Rules.mak
Rob Landley 533320c659 1) ifeq is make syntax, #ifeq is a make comment. 
2) The check_cc macros should probably all have the same number of arguments.
3) Move the -Werror into the gcc 4.0 on i386 test, because gcc 4.1 is broken
and produces warnings for things that provably aren't incorrect.

In other news it would be nice if our check_ld macro actually did something,
and why does or makefile do all the check_cc calls, then call itself as if
it's building out of tree, then do all the check_cc calls again?
2006-07-31 22:56:17 +00:00

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Makefile
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# Rules.make for busybox
#
# Copyright (C) 1999-2005 by Erik Andersen <andersen@codepoet.org>
#
# Licensed under GPLv2, see the file LICENSE in this tarball for details.
#
# Pull in the user's busybox configuration
ifeq ($(filter $(noconfig_targets),$(MAKECMDGOALS)),)
-include $(top_builddir)/.config
endif
#--------------------------------------------------------
PROG := busybox
MAJOR_VERSION :=1
MINOR_VERSION :=2
SUBLEVEL_VERSION:=0
EXTRAVERSION :=
VERSION :=$(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL_VERSION)$(EXTRAVERSION)
BUILDTIME := $(shell TZ=UTC date -u "+%Y.%m.%d-%H:%M%z")
#--------------------------------------------------------
# With a modern GNU make(1) (highly recommended, that's what all the
# developers use), all of the following configuration values can be
# overridden at the command line. For example:
# make CROSS_COMPILE=powerpc-linux- top_srcdir="$HOME/busybox" PREFIX=/mnt/app
#--------------------------------------------------------
# If you are running a cross compiler, you will want to set CROSS_COMPILE
# to something more interesting... Target architecture is determined
# by asking the CC compiler what arch it compiles things for, so unless
# your compiler is broken, you should not need to specify TARGET_ARCH
CC = $(CROSS_COMPILE)gcc
AR = $(CROSS_COMPILE)ar
AS = $(CROSS_COMPILE)as
LD = $(CROSS_COMPILE)ld
NM = $(CROSS_COMPILE)nm
STRIP = $(CROSS_COMPILE)strip
ELF2FLT = $(CROSS_COMPILE)elf2flt
CPP = $(CC) -E
SED ?= sed
BZIP2 ?= bzip2
# What OS are you compiling busybox for? This allows you to include
# OS specific things, syscall overrides, etc.
TARGET_OS=linux
# Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
LC_ALL:= C
# This must bind late because srcdir is reset for every source subdirectory.
INCS:=-I$(top_builddir)/include -I$(top_srcdir)/include
CFLAGS=$(INCS) -I$(srcdir) -D_GNU_SOURCE
CFLAGS+=$(CHECKED_CFLAGS)
ARFLAGS=cru
# gcc centric. Perhaps fiddle with findstring gcc,$(CC) for the rest
# get the CC MAJOR/MINOR version
CC_MAJOR:=$(shell printf "%02d" $(shell echo __GNUC__ | $(CC) -E -xc - | tail -n 1))
CC_MINOR:=$(shell printf "%02d" $(shell echo __GNUC_MINOR__ | $(CC) -E -xc - | tail -n 1))
#--------------------------------------------------------
export VERSION BUILDTIME HOSTCC HOSTCFLAGS CROSS_COMPILE CC AR AS LD NM STRIP CPP
ifeq ($(strip $(TARGET_ARCH)),)
TARGET_ARCH:=$(shell $(CC) -dumpmachine | $(SED) -e s'/-.*//' \
-e 's/i.86/i386/' \
-e 's/sparc.*/sparc/' \
-e 's/arm.*/arm/g' \
-e 's/m68k.*/m68k/' \
-e 's/ppc/powerpc/g' \
-e 's/v850.*/v850/g' \
-e 's/sh[234]/sh/' \
-e 's/mips-.*/mips/' \
-e 's/mipsel-.*/mipsel/' \
-e 's/cris.*/cris/' \
)
endif
# A nifty macro to make testing gcc features easier, but note that everything
# that uses this _must_ use := or it will be re-evaluated everytime it is
# referenced.
ifeq ($(strip $(BUILD_VERBOSE)),2)
VERBOSE_CHECK_CC=echo CC=\"$(1)\" check_cc $(2) >&2;
endif
check_cc=$(shell \
$(VERBOSE_CHECK_CC) \
if [ "x$(1)" != "x" ] && [ "x$(2)" != "x" ]; then \
echo "int i;" > ./conftest.c; \
if $(1) $(2) -c -o conftest.o conftest.c > /dev/null 2>&1; \
then echo "$(2)"; else echo "$(3)"; fi ; \
rm -f conftest.c conftest.o; \
fi)
ifneq ($(filter $(nocheck_targets),$(MAKECMDGOALS)),)
check_cc:=
endif
# A not very robust macro to check for available ld flags
ifeq ($(strip $(BUILD_VERBOSE)),2)
VERBOSE_CHECK_LD=echo LD=\"$(1)\" check_ld $(2) >&2;
endif
check_ld=$(shell \
$(VERBOSE_CHECK_LD) \
if [ "x$(1)" != "x" ] && [ "x$(2)" != "x" ]; then \
$(1) -o /dev/null -b binary /dev/null > /dev/null 2>&1 && \
echo "-Wl,$(2)" ; \
fi)
ifneq ($(filter $(nocheck_targets),$(MAKECMDGOALS)),)
check_ld:=
endif
# A not very robust macro to check for available strip flags
ifeq ($(strip $(BUILD_VERBOSE)),2)
VERBOSE_CHECK_STRIP=echo STRIPCMD=\"$(1)\" check_strip $(2) >&2;
endif
check_strip=$(shell \
$(VERBOSE_CHECK_STRIP) \
if [ "x$(1)" != "x" ] && [ "x$(2)" != "x" ]; then \
echo "int i;" > ./conftest.c ; \
$(CC) -c -o conftest.o conftest.c > /dev/null 2>&1 ; \
$(1) $(2) conftest.o > /dev/null 2>&1 && \
echo "$(1) $(2)" || echo "$(3)"; \
rm -f conftest.c conftest.o > /dev/null 2>&1 ; \
fi)
ifneq ($(filter $(nocheck_targets),$(MAKECMDGOALS)),)
check_strip:=
endif
# Select the compiler needed to build binaries for your development system
HOSTCC = gcc
HOSTCFLAGS:=$(call check_cc,$(HOSTCC),-Wall,)
HOSTCFLAGS+=$(call check_cc,$(HOSTCC),-Wstrict-prototypes,)
HOSTCFLAGS+=$(call check_cc,$(HOSTCC),-O2,)
HOSTCFLAGS+=$(call check_cc,$(HOSTCC),-fomit-frame-pointer,)
LD_WHOLE_ARCHIVE:=$(shell echo "int i;" > conftest.c ; \
$(CC) -c -o conftest.o conftest.c ; \
echo "int main(void){return 0;}" > conftest_main.c ; \
$(CC) -c -o conftest_main.o conftest_main.c ; \
$(AR) $(ARFLAGS) conftest.a conftest.o ; \
$(CC) -Wl,--whole-archive conftest.a -Wl,--no-whole-archive \
conftest_main.o -o conftest > /dev/null 2>&1 \
&& echo "-Wl,--whole-archive" ; \
rm conftest_main.o conftest_main.c conftest.o conftest.c \
conftest.a conftest > /dev/null 2>&1 ; )
ifneq ($(findstring whole-archive,$(LD_WHOLE_ARCHIVE)),)
LD_NO_WHOLE_ARCHIVE:= -Wl,--no-whole-archive
endif
LD_START_GROUP:=$(shell echo "int bar(void){return 0;}" > conftest.c ; \
$(CC) -c -o conftest.o conftest.c ; \
echo "int main(void){return bar();}" > conftest_main.c ; \
$(CC) -c -o conftest_main.o conftest_main.c ; \
$(AR) $(ARFLAGS) conftest.a conftest.o ; \
$(CC) -Wl,--start-group conftest.a conftest_main.o -Wl,--end-group \
-o conftest > /dev/null 2>&1 && echo "-Wl,--start-group" ; \
rm conftest_main.o conftest_main.c conftest.o conftest.c \
conftest.a conftest > /dev/null 2>&1 ; )
ifneq ($(findstring start-group,$(LD_START_GROUP)),)
LD_END_GROUP:= -Wl,--end-group
endif
CHECKED_LDFLAGS := $(call check_ld,$(LD),--warn-common,)
#CHECKED_LDFLAGS := $(call check_ld,$(LD),-static-libgcc,)
# Pin CHECKED_CFLAGS with := so it's only evaluated once.
CHECKED_CFLAGS:=$(call check_cc,$(CC),-Wall,)
CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wstrict-prototypes,)
CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wshadow,)
CHECKED_CFLAGS+=$(call check_cc,$(CC),-funsigned-char,)
CHECKED_CFLAGS+=$(call check_cc,$(CC),-mmax-stack-frame=256,)
CHECKED_CFLAGS+=$(call check_cc,$(CC),-fno-builtin-strlen,)
CHECKED_CFLAGS+=$(call check_cc,$(CC),-finline-limit=0,)
CHECKED_CFLAGS+=$(call check_cc,$(CC),-static-libgcc,)
# Preemptively pin this too.
PROG_CFLAGS:=
#--------------------------------------------------------
# Arch specific compiler optimization stuff should go here.
# Unless you want to override the defaults, do not set anything
# for OPTIMIZATION...
# use '-Os' optimization if available, else use -O2
OPTIMIZATION:=$(call check_cc,$(CC),-Os,-O2)
ifeq ($(CONFIG_BUILD_AT_ONCE),y)
# gcc 2.95 exits with 0 for "unrecognized option"
ifeq ($(strip $(shell [ $(CC_MAJOR) -ge 3 ] ; echo $$?)),0)
CFLAGS_COMBINE:=$(call check_cc,$(CC),--combine,)
endif
OPTIMIZATION+=$(call check_cc,$(CC),-funit-at-a-time,)
OPTIMIZATION+=$(call check_cc,$(CC),-fgcse-after-reload,)
ifneq ($(CONFIG_BUILD_LIBBUSYBOX),y)
# http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25795
# This prevents us from using -fwhole-program when we build the lib
PROG_CFLAGS+=$(call check_cc,$(CC),-fwhole-program,)
endif # CONFIG_BUILD_LIBBUSYBOX
endif # CONFIG_BUILD_AT_ONCE
LIB_LDFLAGS:=$(call check_ld,$(LD),--enable-new-dtags,)
#LIB_LDFLAGS+=$(call check_ld,$(LD),--reduce-memory-overheads,)
#LIB_LDFLAGS+=$(call check_ld,$(LD),--as-needed,)
#LIB_LDFLAGS+=$(call check_ld,$(LD),--warn-shared-textrel,)
# Some nice architecture specific optimizations
ifeq ($(strip $(TARGET_ARCH)),arm)
OPTIMIZATION+=-fstrict-aliasing
endif
ifeq ($(strip $(TARGET_ARCH)),i386)
OPTIMIZATION+=$(call check_cc,$(CC),-march=i386,)
# gcc-4.0 and older seem to benefit from these
ifneq ($(strip $(shell [ $(CC_MAJOR) -ge 4 -a $(CC_MINOR) -ge 1 ] ; echo $$?)),0)
OPTIMIZATION+=$(call check_cc,$(CC),-mpreferred-stack-boundary=2,)
OPTIMIZATION+=$(call check_cc,$(CC),-falign-functions=1 -falign-jumps=1 -falign-loops=1, -malign-functions=0 -malign-jumps=0 -malign-loops=0,)
# gcc 4.1 produces many broken, totally invalid warnings
CHECKED_CFLAGS+=$(call check_cc,$(CC),-Werror,)
endif # gcc-4.0 and older
# gcc-4.1 and beyond seem to benefit from these
ifeq ($(strip $(shell [ $(CC_MAJOR) -ge 4 -a $(CC_MINOR) -ge 1 ] ; echo $$?)),0)
# turn off flags which hurt -Os
OPTIMIZATION+=$(call check_cc,$(CC),-fno-tree-loop-optimize,)
OPTIMIZATION+=$(call check_cc,$(CC),-fno-tree-dominator-opts,)
OPTIMIZATION+=$(call check_cc,$(CC),-fno-strength-reduce,)
OPTIMIZATION+=$(call check_cc,$(CC),-fno-branch-count-reg,)
endif # gcc-4.1 and beyond
endif
OPTIMIZATION+=$(call check_cc,$(CC),-fomit-frame-pointer,)
OPTIMIZATION+=$(call check_cc,$(CC),-ffunction-sections -fdata-sections,)
#
#--------------------------------------------------------
# If you're going to do a lot of builds with a non-vanilla configuration,
# it makes sense to adjust parameters above, so you can type "make"
# by itself, instead of following it by the same half-dozen overrides
# every time. The stuff below, on the other hand, is probably less
# prone to casual user adjustment.
#
ifeq ($(strip $(CONFIG_LFS)),y)
# For large file summit support
CFLAGS+=-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
endif
ifeq ($(strip $(CONFIG_DMALLOC)),y)
# For testing mem leaks with dmalloc
CFLAGS+=-DDMALLOC
LIBRARIES:=-ldmalloc
else
ifeq ($(strip $(CONFIG_EFENCE)),y)
LIBRARIES:=-lefence
endif
endif
# Debugging info
ifeq ($(strip $(CONFIG_DEBUG)),y)
CFLAGS +=-g
else
CFLAGS +=-DNDEBUG
CHECKED_LDFLAGS += $(call check_ld,$(LD),--sort-common,)
CHECKED_LDFLAGS += $(call check_ld,--gc-sections,)
endif
ifneq ($(strip $(CONFIG_DEBUG_PESSIMIZE)),y)
CFLAGS += $(OPTIMIZATION)
endif
# warn a bit more verbosely for non-release versions
ifneq ($(EXTRAVERSION),)
CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wstrict-prototypes,)
CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wmissing-prototypes,)
CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wmissing-declarations,)
CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wunused,)
CHECKED_CFLAGS+=$(call check_cc,$(CC),-Winit-self,)
CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wshadow,)
CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wcast-align,)
endif
STRIPCMD:=$(call check_strip,$(STRIP),-s --remove-section=.note --remove-section=.comment,$(STRIP))
ifeq ($(strip $(CONFIG_STATIC)),y)
PROG_CFLAGS += $(call check_cc,$(CC),-static,)
endif
CFLAGS_SHARED := $(call check_cc,$(CC),-shared,)
LIB_CFLAGS+=$(CFLAGS_SHARED)
ifeq ($(strip $(CONFIG_BUILD_LIBBUSYBOX)),y)
CFLAGS_PIC:= $(call check_cc,$(CC),-fPIC,)
LIB_CFLAGS+=$(CFLAGS_PIC)
endif
ifeq ($(strip $(CONFIG_SELINUX)),y)
LIBRARIES += -lselinux
endif
ifeq ($(strip $(PREFIX)),)
PREFIX:=`pwd`/_install
endif
ifneq ($(strip $(CONFIG_GETOPT_LONG)),y)
CFLAGS += -D__need_getopt
endif
# Additional complications due to support for pristine source dir.
# Include files in the build directory should take precedence over
# the copy in top_srcdir, both during the compilation phase and the
# shell script that finds the list of object files.
# Work in progress by <ldoolitt@recycle.lbl.gov>.
OBJECTS:=$(APPLET_SOURCES:.c=.o) busybox.o usage.o applets.o
CFLAGS += $(CHECKED_CFLAGS) $(CROSS_CFLAGS)
LDFLAGS += $(CHECKED_LDFLAGS)
ifdef BB_INIT_SCRIPT
CFLAGS += -DINIT_SCRIPT='"$(BB_INIT_SCRIPT)"'
endif
# Put user-supplied flags at the end, where they
# have a chance of winning.
-include $(top_builddir)/.config.mak
#------------------------------------------------------------
# Installation options
ifeq ($(strip $(CONFIG_INSTALL_APPLET_HARDLINKS)),y)
INSTALL_OPTS=--hardlinks
endif
ifeq ($(strip $(CONFIG_INSTALL_APPLET_SYMLINKS)),y)
INSTALL_OPTS=--symlinks
endif
ifeq ($(strip $(CONFIG_INSTALL_APPLET_DONT)),y)
INSTALL_OPTS=
endif
#------------------------------------------------------------
# Make the output nice and tight
MAKEFLAGS += --no-print-directory
export MAKE_IS_SILENT=n
ifneq ($(findstring s,$(MAKEFLAGS)),)
export MAKE_IS_SILENT=y
SECHO := @-false
DISP := sil
Q := @
else
ifneq ($(BUILD_VERBOSE),)
SECHO := @-false
DISP := ver
Q :=
else
SECHO := @echo
DISP := pur
Q := @
endif
endif
show_objs = $(subst $(top_builddir)/,,$(subst ../,,$@))
pur_disp_compile.c = echo " "CC $(show_objs)
pur_disp_compile.h = echo " "HOSTCC $(show_objs)
pur_disp_strip = echo " "STRIP $(show_objs)
pur_disp_link = echo " "LINK $(show_objs)
pur_disp_link.h = echo " "HOSTLINK $(show_objs)
pur_disp_ar = echo " "AR $(ARFLAGS) $(show_objs)
pur_disp_elf2flt = echo " "ELF2FLT $(ELF2FLTFLAGS) $(show_objs)
sil_disp_compile.c = true
sil_disp_compile.h = true
sil_disp_strip = true
sil_disp_link = true
sil_disp_link.h = true
sil_disp_ar = true
sil_disp_elf2flt = true
ver_disp_compile.c = echo $(cmd_compile.c)
ver_disp_compile.h = echo $(cmd_compile.h)
ver_disp_strip = echo $(cmd_strip)
ver_disp_link = echo $(cmd_link)
ver_disp_link.h = echo $(cmd_link.h)
ver_disp_ar = echo $(cmd_ar)
ver_disp_elf2flt = echo $(cmd_elf2flt)
disp_compile.c = $($(DISP)_disp_compile.c)
disp_compile.h = $($(DISP)_disp_compile.h)
disp_strip = $($(DISP)_disp_strip)
disp_link = $($(DISP)_disp_link)
disp_link.h = $($(DISP)_disp_link.h)
disp_ar = $($(DISP)_disp_ar)
disp_gen = $(SECHO) " "GEN $@ ; true
disp_doc = $(SECHO) " "DOC $(subst docs/,,$@) ; true
disp_elf2flt = $($(DISP)_disp_elf2flt)
cmd_compile.c = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) -c -o $@ $<
cmd_compile.h = $(HOSTCC) $(HOSTCFLAGS) $(INCS) -c -o $@ $<
cmd_strip = $(STRIPCMD) $@
cmd_link = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(LDFLAGS) \
$(PROG_CFLAGS) $(PROG_LDFLAGS) $(CFLAGS_COMBINE) \
-o $@ $(LD_START_GROUP) \
$(APPLETS_DEFINE) $(APPLET_SRC) \
$(BUSYBOX_DEFINE) $(BUSYBOX_SRC) $(libraries-y) \
$(LDBUSYBOX) $(LIBRARIES) \
$(LD_END_GROUP)
cmd_link.so = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(LDFLAGS) \
$(LIB_CFLAGS) $(CFLAGS_COMBINE) $(LIB_LDFLAGS) \
-o $(@) $(LD_START_GROUP) $(LD_WHOLE_ARCHIVE) \
$(LIBRARY_DEFINE) $(^) \
$(LD_NO_WHOLE_ARCHIVE) $(LD_END_GROUP)
cmd_link.h = $(HOSTCC) $(HOSTCFLAGS) $(INCS) $< -o $@
cmd_ar = $(AR) $(ARFLAGS) $@ $^
cmd_elf2flt = $(ELF2FLT) $(ELF2FLTFLAGS) $< -o $@
compile.c = @$(disp_compile.c) ; $(cmd_compile.c)
compile.h = @$(disp_compile.h) ; $(cmd_compile.h)
do_strip = @$(disp_strip) ; $(cmd_strip)
do_link = @$(disp_link) ; $(cmd_link)
do_link.so = @$(disp_link) ; $(cmd_link.so)
do_link.h = @$(disp_link.h) ; $(cmd_link.h)
do_ar = @$(disp_ar) ; $(cmd_ar)
do_elf2flt = @$(disp_elf2flt) ; $(cmd_elf2flt)
uppercase = $(shell echo $1 | $(SED) -e "y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/")
%.a:
@if test -z "$($(call uppercase,$*)_DIR)" ; then \
echo "Invalid target $@" ; \
exit 1 ; \
fi
$(Q)$(MAKE) $($(call uppercase,$*)_DIR)$@
.PHONY: dummy
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