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linux/arch/um/Makefile
akpm@osdl.org d45e44d4be [PATCH] uml: fix compilation options for USER_OBJS 
From: Jeff Dike <jdike@addtoit.com>, Paolo Giarrusso <blaisorblade@yahoo.it>

Make sure that when compiling USER_OBJS the correct compilation options are
passed; since they are compiled with USER_CFLAGS which is derived from
CFLAGS, make sure it is a recursively evaluated variable, so that changes
to CFLAGS done afterwards the inclusion of arch/$(ARCH)/Makefile are
reflected in USER_CFLAGS.

For instance, without this patch userspace objects are never compiled with
debug info active.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-10-30 12:08:41 -08:00

236 lines
7.2 KiB
Makefile
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#
# This file is included by the global makefile so that you can add your own
# architecture-specific flags and dependencies.
#
# Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
# Licensed under the GPL
#
ARCH_DIR := arch/um
OS := $(shell uname -s)
# We require bash because the vmlinux link and loader script cpp use bash
# features.
SHELL := /bin/bash
filechk_gen_header = $<
core-y += $(ARCH_DIR)/kernel/ \
$(ARCH_DIR)/drivers/ \
$(ARCH_DIR)/os-$(OS)/
# Have to precede the include because the included Makefiles reference them.
SYMLINK_HEADERS := archparam.h system.h sigcontext.h processor.h ptrace.h \
module.h vm-flags.h elf.h host_ldt.h
SYMLINK_HEADERS := $(foreach header,$(SYMLINK_HEADERS),include/asm-um/$(header))
# XXX: The "os" symlink is only used by arch/um/include/os.h, which includes
# ../os/include/file.h
#
# These are cleaned up during mrproper. Please DO NOT fix it again, this is
# the Correct Thing(tm) to do!
ARCH_SYMLINKS = include/asm-um/arch $(ARCH_DIR)/include/sysdep $(ARCH_DIR)/os \
$(SYMLINK_HEADERS) $(ARCH_DIR)/include/uml-config.h
um-modes-$(CONFIG_MODE_TT) += tt
um-modes-$(CONFIG_MODE_SKAS) += skas
MODE_INCLUDE += $(foreach mode,$(um-modes-y),\
-I$(srctree)/$(ARCH_DIR)/include/$(mode))
MAKEFILES-INCL += $(foreach mode,$(um-modes-y),\
$(srctree)/$(ARCH_DIR)/Makefile-$(mode))
ifneq ($(MAKEFILES-INCL),)
include $(MAKEFILES-INCL)
endif
ARCH_INCLUDE := -I$(ARCH_DIR)/include
ifneq ($(KBUILD_SRC),)
ARCH_INCLUDE += -I$(srctree)/$(ARCH_DIR)/include
endif
SYS_DIR := $(ARCH_DIR)/include/sysdep-$(SUBARCH)
# -Dvmap=kernel_vmap prevents anything from referencing the libpcap.o symbol so
# named - it's a common symbol in libpcap, so we get a binary which crashes.
#
# Same things for in6addr_loopback and mktime - found in libc. For these two we
# only get link-time error, luckily.
#
# These apply to USER_CFLAGS to.
CFLAGS += $(CFLAGS-y) -D__arch_um__ -DSUBARCH=\"$(SUBARCH)\" \
$(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap \
-Din6addr_loopback=kernel_in6addr_loopback
AFLAGS += $(ARCH_INCLUDE)
USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -D__KERNEL__,,\
$(patsubst -I%,,$(CFLAGS)))) $(ARCH_INCLUDE) $(MODE_INCLUDE) \
-D_FILE_OFFSET_BITS=64
include $(srctree)/$(ARCH_DIR)/Makefile-$(SUBARCH)
#This will adjust *FLAGS accordingly to the platform.
include $(srctree)/$(ARCH_DIR)/Makefile-os-$(OS)
# -Derrno=kernel_errno - This turns all kernel references to errno into
# kernel_errno to separate them from the libc errno. This allows -fno-common
# in CFLAGS. Otherwise, it would cause ld to complain about the two different
# errnos.
# These apply to kernelspace only.
KERNEL_DEFINES = -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
-Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES)
CFLAGS += $(KERNEL_DEFINES)
CFLAGS += $(call cc-option,-fno-unit-at-a-time,)
# These are needed for clean and mrproper, since in that case .config is not
# included; the values here are meaningless
CONFIG_NEST_LEVEL ?= 0
CONFIG_KERNEL_HALF_GIGS ?= 0
SIZE = (($(CONFIG_NEST_LEVEL) + $(CONFIG_KERNEL_HALF_GIGS)) * 0x20000000)
PHONY += linux
all: linux
linux: vmlinux
@echo ' LINK $@'
$(Q)ln -f $< $@
define archhelp
echo '* linux - Binary kernel image (./linux) - for backward'
echo ' compatibility only, this creates a hard link to the'
echo ' real kernel binary, the "vmlinux" binary you'
echo ' find in the kernel root.'
endef
ifneq ($(KBUILD_SRC),)
$(shell mkdir -p $(ARCH_DIR) && ln -fsn $(srctree)/$(ARCH_DIR)/Kconfig.$(SUBARCH) $(ARCH_DIR)/Kconfig.arch)
else
$(shell cd $(ARCH_DIR) && ln -sf Kconfig.$(SUBARCH) Kconfig.arch)
endif
archprepare: $(ARCH_SYMLINKS) $(ARCH_DIR)/include/user_constants.h
prepare: $(ARCH_DIR)/include/kern_constants.h
LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib
CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \
$(call cc-option, -fno-stack-protector,) \
$(call cc-option, -fno-stack-protector-all,)
CPP_MODE-$(CONFIG_MODE_TT) := -DMODE_TT
CONFIG_KERNEL_STACK_ORDER ?= 2
STACK_SIZE := $(shell echo $$[ 4096 * (1 << $(CONFIG_KERNEL_STACK_ORDER)) ] )
ifndef START
START = $(shell echo $$[ $(TOP_ADDR) - $(SIZE) ] )
endif
CPPFLAGS_vmlinux.lds = -U$(SUBARCH) \
-DSTART=$(START) -DELF_ARCH=$(ELF_ARCH) \
-DELF_FORMAT="$(ELF_FORMAT)" $(CPP_MODE-y) \
-DKERNEL_STACK_SIZE=$(STACK_SIZE) \
-DUNMAP_PATH=arch/um/sys-$(SUBARCH)/unmap.o
#The wrappers will select whether using "malloc" or the kernel allocator.
LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS)
define cmd_vmlinux__
$(CC) $(CFLAGS_vmlinux) -o $@ \
-Wl,-T,$(vmlinux-lds) $(vmlinux-init) \
-Wl,--start-group $(vmlinux-main) -Wl,--end-group \
-lutil \
$(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) \
FORCE ,$^) ; rm -f linux
endef
#When cleaning we don't include .config, so we don't include
#TT or skas makefiles and don't clean skas_ptregs.h.
CLEAN_FILES += linux x.i gmon.out $(ARCH_DIR)/include/uml-config.h \
$(ARCH_DIR)/include/user_constants.h \
$(ARCH_DIR)/include/kern_constants.h $(ARCH_DIR)/Kconfig.arch
MRPROPER_FILES += $(ARCH_SYMLINKS)
archclean:
@find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
-o -name '*.gcov' \) -type f -print | xargs rm -f
$(SYMLINK_HEADERS):
@echo ' SYMLINK $@'
ifneq ($(KBUILD_SRC),)
$(Q)mkdir -p $(objtree)/include/asm-um
$(Q)ln -fsn $(srctree)/include/asm-um/$(basename $(notdir $@))-$(SUBARCH)$(suffix $@) $@
else
$(Q)cd $(TOPDIR)/$(dir $@) ; \
ln -sf $(basename $(notdir $@))-$(SUBARCH)$(suffix $@) $(notdir $@)
endif
include/asm-um/arch:
@echo ' SYMLINK $@'
ifneq ($(KBUILD_SRC),)
$(Q)mkdir -p $(objtree)/include/asm-um
$(Q)ln -fsn $(srctree)/include/asm-$(SUBARCH) include/asm-um/arch
else
$(Q)cd $(TOPDIR)/include/asm-um && ln -sf ../asm-$(SUBARCH) arch
endif
$(objtree)/$(ARCH_DIR)/include:
@echo ' MKDIR $@'
$(Q)mkdir -p $@
$(ARCH_DIR)/include/sysdep: $(objtree)/$(ARCH_DIR)/include
@echo ' SYMLINK $@'
ifneq ($(KBUILD_SRC),)
$(Q)ln -fsn $(srctree)/$(ARCH_DIR)/include/sysdep-$(SUBARCH) $(ARCH_DIR)/include/sysdep
else
$(Q)cd $(ARCH_DIR)/include && ln -sf sysdep-$(SUBARCH) sysdep
endif
$(ARCH_DIR)/os:
@echo ' SYMLINK $@'
ifneq ($(KBUILD_SRC),)
$(Q)ln -fsn $(srctree)/$(ARCH_DIR)/os-$(OS) $(ARCH_DIR)/os
else
$(Q)cd $(ARCH_DIR) && ln -sf os-$(OS) os
endif
# Generated files
define filechk_umlconfig
sed 's/ CONFIG/ UML_CONFIG/'
endef
$(ARCH_DIR)/include/uml-config.h : include/linux/autoconf.h
$(call filechk,umlconfig)
$(ARCH_DIR)/sys-$(SUBARCH)/user-offsets.s: FORCE
$(Q)$(MAKE) $(build)=$(ARCH_DIR)/sys-$(SUBARCH) $@
define filechk_gen-asm-offsets
(set -e; \
echo "/*"; \
echo " * DO NOT MODIFY."; \
echo " *"; \
echo " * This file was generated by arch/$(ARCH)/Makefile"; \
echo " *"; \
echo " */"; \
echo ""; \
sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
echo ""; )
endef
$(ARCH_DIR)/include/user_constants.h: $(ARCH_DIR)/sys-$(SUBARCH)/user-offsets.s
$(call filechk,gen-asm-offsets)
$(ARCH_DIR)/include/kern_constants.h: $(objtree)/$(ARCH_DIR)/include
@echo ' SYMLINK $@'
$(Q)ln -sf ../../../include/asm-um/asm-offsets.h $@
export SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS
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