51b563fc93
Albin Tonnerre <albin.tonnerre@free-electrons.com> reported:
Bash 4 filters out variables which contain a dot in them.
This happends to be the case of CPPFLAGS_vmlinux.lds.
This is rather unfortunate, as it now causes
build failures when using SHELL=/bin/bash to compile,
or when bash happens to be used by make (eg when it's /bin/sh)
Remove the common definition of CPPFLAGS_vmlinux.lds by
pushing relevant stuff to either Makefile.build or the
arch specific kernel/Makefile where we build the linker script.
This is also nice cleanup as we move the information out where
it is used.
Notes for the different architectures touched:
arm - we use an already exported symbol
cris - we use a config symbol aleady available
[Not build tested]
mips - the jiffies complexity has moved to vmlinux.lds.S where we need it.
Added a few variables to CPPFLAGS - they are only used by
the linker script.
[Not build tested]
powerpc - removed assignment that is not needed
[not build tested]
sparc - simplified it using $(BITS)
um - introduced a few new exported variables to deal with this
xtensa - added options to CPP invocation
[not build tested]
Cc: Albin Tonnerre <albin.tonnerre@free-electrons.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Mikael Starvik <starvik@axis.com>
Cc: Jesper Nilsson <jesper.nilsson@axis.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Chris Zankel <chris@zankel.net>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
154 lines
4.9 KiB
Makefile
154 lines
4.9 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 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.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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MODE_INCLUDE += -I$(srctree)/$(ARCH_DIR)/include/shared/skas
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include $(srctree)/$(ARCH_DIR)/Makefile-skas
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SHARED_HEADERS := $(ARCH_DIR)/include/shared
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ARCH_INCLUDE := -I$(srctree)/$(SHARED_HEADERS)
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ARCH_INCLUDE += -I$(srctree)/$(ARCH_DIR)/sys-$(SUBARCH)/shared
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ifneq ($(KBUILD_SRC),)
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ARCH_INCLUDE += -I$(SHARED_HEADERS)
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endif
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KBUILD_CPPFLAGS += -I$(srctree)/$(ARCH_DIR)/sys-$(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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KBUILD_CFLAGS += $(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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-Din6addr_any=kernel_in6addr_any
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KBUILD_AFLAGS += $(ARCH_INCLUDE)
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USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -D__KERNEL__,,\
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$(patsubst -I%,,$(KBUILD_CFLAGS)))) $(ARCH_INCLUDE) $(MODE_INCLUDE) \
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$(filter -I%,$(CFLAGS)) -D_FILE_OFFSET_BITS=64
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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-$(OS)
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KBUILD_CPPFLAGS += -I$(srctree)/arch/$(HEADER_ARCH)/include
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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 KBUILD_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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#
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# strip leading and trailing whitespace to make the USER_CFLAGS removal of these
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# defines more robust
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KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
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-Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES))
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KBUILD_CFLAGS += $(KERNEL_DEFINES)
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PHONY += linux
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all: linux
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linux: vmlinux
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@echo ' LINK $@'
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$(Q)ln -f $< $@
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define archhelp
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echo '* linux - Binary kernel image (./linux) - for backward'
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echo ' compatibility only, this creates a hard link to the'
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echo ' real kernel binary, the "vmlinux" binary you'
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echo ' find in the kernel root.'
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endef
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KBUILD_KCONFIG := arch/um/Kconfig.$(HEADER_ARCH)
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archprepare: $(SHARED_HEADERS)/user_constants.h
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archprepare: $(SHARED_HEADERS)/kern_constants.h
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LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
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LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib
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CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \
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$(call cc-option, -fno-stack-protector,) \
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$(call cc-option, -fno-stack-protector-all,)
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# Options used by linker script
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export LDS_START := $(START)
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export LDS_ELF_ARCH := $(ELF_ARCH)
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export LDS_ELF_FORMAT := $(ELF_FORMAT)
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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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LD_FLAGS_CMDLINE = $(foreach opt,$(LDFLAGS),-Wl,$(opt))
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CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE)
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define cmd_vmlinux__
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$(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) $(vmlinux-main) vmlinux.o \
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FORCE ,$^) ; 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 \
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$(SHARED_HEADERS)/user_constants.h \
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$(SHARED_HEADERS)/kern_constants.h
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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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# Generated files
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$(ARCH_DIR)/sys-$(SUBARCH)/user-offsets.s: FORCE
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$(Q)$(MAKE) $(build)=$(ARCH_DIR)/sys-$(SUBARCH) $@
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define filechk_gen-asm-offsets
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(set -e; \
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echo "/*"; \
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echo " * DO NOT MODIFY."; \
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echo " *"; \
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echo " * This file was generated by arch/$(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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$(SHARED_HEADERS)/user_constants.h: $(ARCH_DIR)/sys-$(SUBARCH)/user-offsets.s
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$(call filechk,gen-asm-offsets)
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$(SHARED_HEADERS)/kern_constants.h:
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$(Q)mkdir -p $(dir $@)
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$(Q)echo '#include "../../../../include/asm/asm-offsets.h"' >$@
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export SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS HEADER_ARCH DEV_NULL_PATH
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