4f1933620f
The kbuild system takes advantage of an incorrect behavior in GNU make. Once this behavior is fixed, all files in the kernel rebuild every time, even if nothing has changed. This patch ensures kbuild works with both the incorrect and correct behaviors of GNU make. For more details on the incorrect behavior, see: http://lists.gnu.org/archive/html/bug-make/2006-03/msg00003.html Changes in this patch: - Keep all targets that are to be marked .PHONY in a variable, PHONY. - Add .PHONY: $(PHONY) to mark them properly. - Remove any $(PHONY) files from the $? list when determining whether targets are up-to-date or not. Signed-off-by: Paul Smith <psmith@gnu.org> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
232 lines
7 KiB
Makefile
232 lines
7 KiB
Makefile
#
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# This file is included by the global makefile so that you can add your own
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# architecture-specific flags and dependencies.
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#
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# Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
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# Licensed under the GPL
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#
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ARCH_DIR := arch/um
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OS := $(shell uname -s)
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# We require bash because the vmlinux link and loader script cpp use bash
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# features.
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SHELL := /bin/bash
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filechk_gen_header = $<
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core-y += $(ARCH_DIR)/kernel/ \
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$(ARCH_DIR)/drivers/ \
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$(ARCH_DIR)/os-$(OS)/
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# Have to precede the include because the included Makefiles reference them.
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SYMLINK_HEADERS := archparam.h system.h sigcontext.h processor.h ptrace.h \
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module.h vm-flags.h elf.h ldt.h
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SYMLINK_HEADERS := $(foreach header,$(SYMLINK_HEADERS),include/asm-um/$(header))
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# XXX: The "os" symlink is only used by arch/um/include/os.h, which includes
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# ../os/include/file.h
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#
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# These are cleaned up during mrproper. Please DO NOT fix it again, this is
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# the Correct Thing(tm) to do!
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ARCH_SYMLINKS = include/asm-um/arch $(ARCH_DIR)/include/sysdep $(ARCH_DIR)/os \
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$(SYMLINK_HEADERS) $(ARCH_DIR)/include/uml-config.h
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um-modes-$(CONFIG_MODE_TT) += tt
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um-modes-$(CONFIG_MODE_SKAS) += skas
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MODE_INCLUDE += $(foreach mode,$(um-modes-y),\
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-I$(srctree)/$(ARCH_DIR)/include/$(mode))
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MAKEFILES-INCL += $(foreach mode,$(um-modes-y),\
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$(srctree)/$(ARCH_DIR)/Makefile-$(mode))
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ifneq ($(MAKEFILES-INCL),)
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include $(MAKEFILES-INCL)
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endif
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ARCH_INCLUDE := -I$(ARCH_DIR)/include
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ifneq ($(KBUILD_SRC),)
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ARCH_INCLUDE += -I$(srctree)/$(ARCH_DIR)/include
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endif
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SYS_DIR := $(ARCH_DIR)/include/sysdep-$(SUBARCH)
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# -Dvmap=kernel_vmap prevents anything from referencing the libpcap.o symbol so
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# named - it's a common symbol in libpcap, so we get a binary which crashes.
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#
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# Same things for in6addr_loopback and mktime - found in libc. For these two we
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# only get link-time error, luckily.
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#
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# These apply to USER_CFLAGS to.
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CFLAGS += $(CFLAGS-y) -D__arch_um__ -DSUBARCH=\"$(SUBARCH)\" \
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$(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap \
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-Din6addr_loopback=kernel_in6addr_loopback
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AFLAGS += $(ARCH_INCLUDE)
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USER_CFLAGS := $(patsubst -I%,,$(CFLAGS))
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USER_CFLAGS := $(patsubst -D__KERNEL__,,$(USER_CFLAGS)) $(ARCH_INCLUDE) \
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$(MODE_INCLUDE) -D_FILE_OFFSET_BITS=64
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# -Derrno=kernel_errno - This turns all kernel references to errno into
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# kernel_errno to separate them from the libc errno. This allows -fno-common
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# in CFLAGS. Otherwise, it would cause ld to complain about the two different
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# errnos.
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# These apply to kernelspace only.
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CFLAGS += -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
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-Dmktime=kernel_mktime
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CFLAGS += $(call cc-option,-fno-unit-at-a-time,)
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include $(srctree)/$(ARCH_DIR)/Makefile-$(SUBARCH)
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#This will adjust *FLAGS accordingly to the platform.
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include $(srctree)/$(ARCH_DIR)/Makefile-os-$(OS)
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# These are needed for clean and mrproper, since in that case .config is not
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# included; the values here are meaningless
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CONFIG_NEST_LEVEL ?= 0
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CONFIG_KERNEL_HALF_GIGS ?= 0
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SIZE = (($(CONFIG_NEST_LEVEL) + $(CONFIG_KERNEL_HALF_GIGS)) * 0x20000000)
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PHONY += linux
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all: linux
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linux: vmlinux
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ln -f $< $@
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define archhelp
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echo '* linux - Binary kernel image (./linux) - for backward'
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echo ' compatibility only, this creates a hard link to the'
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echo ' real kernel binary, the the "vmlinux" binary you'
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echo ' find in the kernel root.'
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endef
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ifneq ($(KBUILD_SRC),)
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$(shell mkdir -p $(ARCH_DIR) && ln -fsn $(srctree)/$(ARCH_DIR)/Kconfig.$(SUBARCH) $(ARCH_DIR)/Kconfig.arch)
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else
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$(shell cd $(ARCH_DIR) && ln -sf Kconfig.$(SUBARCH) Kconfig.arch)
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endif
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archprepare: $(ARCH_SYMLINKS) $(ARCH_DIR)/include/user_constants.h
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prepare: $(ARCH_DIR)/include/kern_constants.h
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LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
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LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib
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CPP_MODE-$(CONFIG_MODE_TT) := -DMODE_TT
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CONFIG_KERNEL_STACK_ORDER ?= 2
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STACK_SIZE := $(shell echo $$[ 4096 * (1 << $(CONFIG_KERNEL_STACK_ORDER)) ] )
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ifndef START
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START = $(shell echo $$[ $(TOP_ADDR) - $(SIZE) ] )
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endif
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CPPFLAGS_vmlinux.lds = -U$(SUBARCH) \
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-DSTART=$(START) -DELF_ARCH=$(ELF_ARCH) \
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-DELF_FORMAT="$(ELF_FORMAT)" $(CPP_MODE-y) \
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-DKERNEL_STACK_SIZE=$(STACK_SIZE) \
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-DUNMAP_PATH=arch/um/sys-$(SUBARCH)/unmap_fin.o
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#The wrappers will select whether using "malloc" or the kernel allocator.
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LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
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CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS)
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define cmd_vmlinux__
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$(CC) $(CFLAGS_vmlinux) -o $@ \
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-Wl,-T,$(vmlinux-lds) $(vmlinux-init) \
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-Wl,--start-group $(vmlinux-main) -Wl,--end-group \
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-lutil \
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$(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) \
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FORCE ,$^) ; rm -f linux
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endef
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#When cleaning we don't include .config, so we don't include
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#TT or skas makefiles and don't clean skas_ptregs.h.
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CLEAN_FILES += linux x.i gmon.out $(ARCH_DIR)/include/uml-config.h \
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$(ARCH_DIR)/include/user_constants.h \
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$(ARCH_DIR)/include/kern_constants.h $(ARCH_DIR)/Kconfig.arch
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MRPROPER_FILES += $(SYMLINK_HEADERS) $(ARCH_SYMLINKS) \
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$(addprefix $(ARCH_DIR)/kernel/,$(KERN_SYMLINKS)) $(ARCH_DIR)/os
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archclean:
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@find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
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-o -name '*.gcov' \) -type f -print | xargs rm -f
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$(SYMLINK_HEADERS):
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@echo ' SYMLINK $@'
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ifneq ($(KBUILD_SRC),)
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$(Q)ln -fsn $(srctree)/include/asm-um/$(basename $(notdir $@))-$(SUBARCH)$(suffix $@) $@
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else
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$(Q)cd $(TOPDIR)/$(dir $@) ; \
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ln -sf $(basename $(notdir $@))-$(SUBARCH)$(suffix $@) $(notdir $@)
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endif
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include/asm-um/arch:
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@echo ' SYMLINK $@'
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ifneq ($(KBUILD_SRC),)
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$(Q)mkdir -p include/asm-um
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$(Q)ln -fsn $(srctree)/include/asm-$(SUBARCH) include/asm-um/arch
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else
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$(Q)cd $(TOPDIR)/include/asm-um && ln -sf ../asm-$(SUBARCH) arch
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endif
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$(objtree)/$(ARCH_DIR)/include:
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@echo ' MKDIR $@'
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$(Q)mkdir -p $@
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$(ARCH_DIR)/include/sysdep: $(objtree)/$(ARCH_DIR)/include
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@echo ' SYMLINK $@'
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ifneq ($(KBUILD_SRC),)
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$(Q)ln -fsn $(srctree)/$(ARCH_DIR)/include/sysdep-$(SUBARCH) $(ARCH_DIR)/include/sysdep
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else
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$(Q)cd $(ARCH_DIR)/include && ln -sf sysdep-$(SUBARCH) sysdep
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endif
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$(ARCH_DIR)/os:
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@echo ' SYMLINK $@'
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ifneq ($(KBUILD_SRC),)
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$(Q)ln -fsn $(srctree)/$(ARCH_DIR)/os-$(OS) $(ARCH_DIR)/os
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else
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$(Q)cd $(ARCH_DIR) && ln -sf os-$(OS) os
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endif
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# Generated files
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define filechk_umlconfig
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sed 's/ CONFIG/ UML_CONFIG/'
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endef
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$(ARCH_DIR)/include/uml-config.h : include/linux/autoconf.h
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$(call filechk,umlconfig)
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$(ARCH_DIR)/user-offsets.s: $(ARCH_DIR)/sys-$(SUBARCH)/user-offsets.c
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$(CC) $(USER_CFLAGS) -S -o $@ $<
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define filechk_gen-asm-offsets
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(set -e; \
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echo "/*"; \
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echo " * DO NOT MODIFY."; \
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echo " *"; \
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echo " * This file was generated by arch/$(ARCH)/Makefile"; \
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echo " *"; \
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echo " */"; \
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echo ""; \
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sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
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echo ""; )
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endef
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$(ARCH_DIR)/include/user_constants.h: $(ARCH_DIR)/user-offsets.s
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$(call filechk,gen-asm-offsets)
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CLEAN_FILES += $(ARCH_DIR)/user-offsets.s
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$(ARCH_DIR)/include/kern_constants.h: $(objtree)/$(ARCH_DIR)/include
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@echo ' SYMLINK $@'
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$(Q) ln -sf ../../../include/asm-um/asm-offsets.h $@
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export SUBARCH USER_CFLAGS OS
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