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-rw-r--r--Makefile62
1 files changed, 52 insertions, 10 deletions
diff --git a/Makefile b/Makefile
index 433493a2b77..f908accd332 100644
--- a/Makefile
+++ b/Makefile
@@ -179,9 +179,46 @@ SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
# Alternatively CROSS_COMPILE can be set in the environment.
# Default value for CROSS_COMPILE is not to prefix executables
# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
+#
+# To force ARCH and CROSS_COMPILE settings include kernel.* files
+# in the kernel tree - do not patch this file.
export KBUILD_BUILDHOST := $(SUBARCH)
-ARCH ?= $(SUBARCH)
-CROSS_COMPILE ?=
+
+# Kbuild save the ARCH and CROSS_COMPILE setting in kernel.* files.
+# Restore these settings and check that user did not specify
+# conflicting values.
+
+saved_arch := $(shell cat include/generated/kernel.arch 2> /dev/null)
+saved_cross := $(shell cat include/generated/kernel.cross 2> /dev/null)
+
+ifneq ($(CROSS_COMPILE),)
+ ifneq ($(saved_cross),)
+ ifneq ($(CROSS_COMPILE),$(saved_cross))
+ $(error CROSS_COMPILE changed from \
+ "$(saved_cross)" to \
+ to "$(CROSS_COMPILE)". \
+ Use "make mrproper" to fix it up)
+ endif
+ endif
+else
+ CROSS_COMPILE := $(saved_cross)
+endif
+
+ifneq ($(ARCH),)
+ ifneq ($(saved_arch),)
+ ifneq ($(saved_arch),$(ARCH))
+ $(error ARCH changed from \
+ "$(saved_arch)" to "$(ARCH)". \
+ Use "make mrproper" to fix it up)
+ endif
+ endif
+else
+ ifneq ($(saved_arch),)
+ ARCH := $(saved_arch)
+ else
+ ARCH := $(SUBARCH)
+ endif
+endif
# Architecture as present in compile.h
UTS_MACHINE := $(ARCH)
@@ -315,6 +352,7 @@ OBJCOPY = $(CROSS_COMPILE)objcopy
OBJDUMP = $(CROSS_COMPILE)objdump
AWK = awk
GENKSYMS = scripts/genksyms/genksyms
+INSTALLKERNEL := installkernel
DEPMOD = /sbin/depmod
KALLSYMS = scripts/kallsyms
PERL = perl
@@ -353,7 +391,8 @@ KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
-export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
+export CPP AR NM STRIP OBJCOPY OBJDUMP
+export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
@@ -444,6 +483,11 @@ ifeq ($(config-targets),1)
include $(srctree)/arch/$(SRCARCH)/Makefile
export KBUILD_DEFCONFIG KBUILD_KCONFIG
+# save ARCH & CROSS_COMPILE settings
+$(shell mkdir -p include/generated && \
+ echo $(ARCH) > include/generated/kernel.arch && \
+ echo $(CROSS_COMPILE) > include/generated/kernel.cross)
+
config: scripts_basic outputmakefile FORCE
$(Q)mkdir -p include/linux include/config
$(Q)$(MAKE) $(build)=scripts/kconfig $@
@@ -571,6 +615,9 @@ KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
# revert to pre-gcc-4.4 behaviour of .eh_frame
KBUILD_CFLAGS += $(call cc-option,-fno-dwarf2-cfi-asm)
+# conserve stack if available
+KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
+
# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
# But warn user when we do so
warn-assign = \
@@ -591,12 +638,12 @@ endif
# Use --build-id when available.
LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
- $(call ld-option, -Wl$(comma)--build-id,))
+ $(call cc-ldoption, -Wl$(comma)--build-id,))
LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
-LDFLAGS_vmlinux += -X
+LDFLAGS_vmlinux += $(call ld-option, -X,)
endif
# Default kernel image to build when no specific target is given.
@@ -980,11 +1027,6 @@ prepare0: archprepare FORCE
# All the preparing..
prepare: prepare0
-# Leave this as default for preprocessing vmlinux.lds.S, which is now
-# done in arch/$(ARCH)/kernel/Makefile
-
-export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
-
# The asm symlink changes when $(ARCH) changes.
# Detect this and ask user to run make mrproper
# If asm is a stale symlink (point to dir that does not exist) remove it