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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen master] build: adding out-of-tree support to the xen build
commit 7115fa562fe79c8a8733f6b821d4eea62ed56516
Author: Anthony PERARD <anthony.perard@xxxxxxxxxx>
AuthorDate: Wed Apr 13 12:33:21 2022 +0200
Commit: Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Apr 13 12:33:21 2022 +0200
build: adding out-of-tree support to the xen build
This implement out-of-tree support, there's two ways to create an
out-of-tree build tree (after that, `make` in that new directory
works):
make O=build
mkdir build; cd build; make -f ../Makefile
also works with an absolute path for both.
This implementation only works if the source tree is clean, as we use
VPATH.
This patch copies most new code with handling out-of-tree build from
Linux v5.12.
Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
Reviewed-by: Daniel P. Smith <dpsmith@xxxxxxxxxxxxxxxxxxxx>
Acked-by: Julien Grall <jgrall@xxxxxxxxxx>
Tested-by: Julien Grall <jgrall@xxxxxxxxxx>
Acked-by: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx> # livepatch
---
.gitignore | 1 +
xen/Makefile | 143 ++++++++++++++++++++++++++++++++++++++-----
xen/Rules.mk | 11 +++-
xen/arch/x86/arch.mk | 5 +-
xen/arch/x86/boot/Makefile | 6 ++
xen/common/efi/efi-common.mk | 3 +-
xen/include/Makefile | 11 ++--
xen/test/livepatch/Makefile | 2 +
xen/xsm/flask/Makefile | 3 +-
xen/xsm/flask/ss/Makefile | 1 +
10 files changed, 164 insertions(+), 22 deletions(-)
diff --git a/.gitignore b/.gitignore
index d425be4bd9..c6d2c4b4f1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -325,6 +325,7 @@ xen/include/xen/*.new
xen/include/xen/acm_policy.h
xen/include/xen/compile.h
xen/include/xen/lib/x86/cpuid-autogen.h
+xen/source
xen/test/livepatch/config.h
xen/test/livepatch/expect_config.h
xen/test/livepatch/*.livepatch
diff --git a/xen/Makefile b/xen/Makefile
index ebc7854c08..dd05672ff4 100644
--- a/xen/Makefile
+++ b/xen/Makefile
@@ -1,3 +1,7 @@
+# $(lastword,) for GNU Make older than 3.81
+lastword = $(word $(words $(1)),$(1))
+this-makefile := $(call lastword,$(MAKEFILE_LIST))
+
# This is the correct place to edit the build version.
# All other places this is stored (eg. compile.h) should be autogenerated.
export XEN_VERSION = 4
@@ -19,6 +23,13 @@ export PYTHON ?= $(PYTHON_INTERPRETER)
export CHECKPOLICY ?= checkpolicy
+$(if $(filter __%, $(MAKECMDGOALS)), \
+ $(error targets prefixed with '__' are only for internal use))
+
+# That's our default target when none is given on the command line
+PHONY := __all
+__all:
+
# Do not use make's built-in rules and variables
MAKEFLAGS += -rR
@@ -37,9 +48,6 @@ export CC CXX LD NM OBJCOPY OBJDUMP ADDR2LINE
export TARGET := xen
-.PHONY: default
-default: build
-
.PHONY: dist
dist: install
@@ -118,16 +126,88 @@ endif
export quiet Q KBUILD_VERBOSE
+# $(realpath,) for GNU Make older than 3.81
+realpath = $(wildcard $(foreach file,$(1),$(shell cd -P $(dir $(file)) && echo
"$$PWD/$(notdir $(file))")))
+
+ifeq ("$(origin O)", "command line")
+ KBUILD_OUTPUT := $(O)
+endif
+
+ifneq ($(KBUILD_OUTPUT),)
+# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
+# expand a shell special character '~'. We use a somewhat tedious way here.
+abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
+$(if $(abs_objtree),, \
+ $(error failed to create output directory "$(KBUILD_OUTPUT)"))
+
+# $(realpath ...) resolves symlinks
+abs_objtree := $(call realpath,$(abs_objtree))
+else
abs_objtree := $(CURDIR)
-abs_srctree := $(CURDIR)
+endif
+
+ifeq ($(abs_objtree),$(CURDIR))
+# Suppress "Entering directory ..." unless we are changing the work directory.
+MAKEFLAGS += --no-print-directory
+else
+need-sub-make := 1
+endif
+
+abs_srctree := $(call realpath,$(dir $(this-makefile)))
+
+ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
+$(error source directory cannot contain spaces or colons)
+endif
+
+ifneq ($(abs_srctree),$(abs_objtree))
+# Look for make include files relative to root of kernel src
+#
+# This does not become effective immediately because MAKEFLAGS is re-parsed
+# once after the Makefile is read. We need to invoke sub-make.
+MAKEFLAGS += --include-dir=$(abs_srctree)
+need-sub-make := 1
+endif
export abs_srctree abs_objtree
+export root-make-done := y
+
+ifeq ($(need-sub-make),1)
+
+PHONY += $(MAKECMDGOALS) __sub-make
+
+$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
+ @:
+
+# Invoke a second make in the output directory, passing relevant variables
+__sub-make:
+ $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
+
+endif # need-sub-make
+endif # root-make-done
+
+# We process the rest of the Makefile if this is the final invocation of make
+ifeq ($(need-sub-make),)
+
+ifeq ($(abs_srctree),$(abs_objtree))
+ # building in the source tree
+ srctree := .
+ building_out_of_srctree :=
+else
+ ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
+ # building in a subdirectory of the source tree
+ srctree := ..
+ else
+ srctree := $(abs_srctree)
+ endif
+ building_out_of_srctree := 1
+endif
-srctree := .
objtree := .
-export srctree objtree
+VPATH := $(srctree)
+
+export building_out_of_srctree srctree objtree VPATH
-export XEN_ROOT := $(CURDIR)/..
+export XEN_ROOT := $(abs_srctree)/..
# To make sure we do not include .config for any of the *config targets
# catch them early, and hand them over to tools/kconfig/Makefile
@@ -204,9 +284,6 @@ endif
export XEN_HAS_CHECKPOLICY := $(call success,$(CHECKPOLICY) -h 2>&1 | grep -q
xen)
-export root-make-done := y
-endif # root-make-done
-
# ===========================================================================
# Rules shared between *config targets and build targets
@@ -214,6 +291,37 @@ PHONY += tools_fixdep
tools_fixdep:
$(Q)$(MAKE) $(build)=tools tools/fixdep
+PHONY += outputmakefile
+# Before starting out-of-tree build, make sure the source tree is clean.
+# outputmakefile generates a Makefile in the output directory, if using a
+# separate output directory. This allows convenient use of make in the
+# output directory.
+# At the same time when output Makefile generated, generate .gitignore to
+# ignore whole output directory
+
+quiet_cmd_makefile = GEN Makefile
+cmd_makefile = { \
+ echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \
+ echo "include $(srctree)/Makefile"; \
+ } > Makefile
+
+outputmakefile:
+ $(Q)ln -fsn $(srctree) source
+ifdef building_out_of_srctree
+ $(Q)if [ -f $(srctree)/.config -o \
+ -d $(srctree)/include/config -o \
+ -d $(srctree)/include/generated ]; then \
+ echo >&2 "***"; \
+ echo >&2 "*** The source tree is not clean, please run
'make$(if $(findstring command line, $(origin XEN_TARGET_ARCH)),
XEN_TARGET_ARCH=$(XEN_TARGET_ARCH)) distclean'"; \
+ echo >&2 "*** in $(abs_srctree)";\
+ echo >&2 "***"; \
+ false; \
+ fi
+ $(call cmd,makefile)
+ $(Q)test -e .gitignore || \
+ { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
+endif
+
ifeq ($(config-build),y)
# ===========================================================================
# *config targets only - make sure prerequisites are updated, and descend
@@ -229,13 +337,13 @@ filechk_kconfig_allconfig = \
.allconfig.tmp: FORCE
set -e; { $(call filechk_kconfig_allconfig); } > $@
-config: tools_fixdep FORCE
+config: tools_fixdep outputmakefile FORCE
$(Q)$(MAKE) $(build)=tools/kconfig $@
# Config.mk tries to include .config file, don't try to remake it
%/.config: ;
-%config: .allconfig.tmp tools_fixdep FORCE
+%config: .allconfig.tmp tools_fixdep outputmakefile FORCE
$(Q)$(MAKE) $(build)=tools/kconfig KCONFIG_ALLCONFIG=$< $@
else # !config-build
@@ -312,6 +420,10 @@ CFLAGS += -flto
LDFLAGS-$(CONFIG_CC_IS_CLANG) += -plugin LLVMgold.so
endif
+ifdef building_out_of_srctree
+ CFLAGS += -I$(objtree)/include
+ CFLAGS += -I$(objtree)/arch/$(TARGET_ARCH)/include
+endif
CFLAGS += -I$(srctree)/include
CFLAGS += -I$(srctree)/arch/$(TARGET_ARCH)/include
@@ -335,6 +447,8 @@ export CFLAGS_UBSAN
endif # need-config
+__all: build
+
main-targets := build install uninstall clean distclean MAP
.PHONY: $(main-targets)
ifneq ($(XEN_TARGET_ARCH),x86_32)
@@ -431,13 +545,13 @@ _clean:
.PHONY: _distclean
_distclean: clean
- rm -f tags TAGS cscope.files cscope.in.out cscope.out cscope.po.out
GTAGS GPATH GRTAGS GSYMS .config
+ rm -f tags TAGS cscope.files cscope.in.out cscope.out cscope.po.out
GTAGS GPATH GRTAGS GSYMS .config source
$(TARGET).gz: $(TARGET)
gzip -n -f -9 < $< > $@.new
mv $@.new $@
-$(TARGET): FORCE
+$(TARGET): outputmakefile FORCE
$(Q)$(MAKE) $(build)=tools
$(Q)$(MAKE) $(build)=. include/xen/compile.h
$(Q)$(MAKE) $(build)=include all
@@ -506,6 +620,7 @@ cloc:
done | cloc --list-file=-
endif #config-build
+endif # need-sub-make
PHONY += FORCE
FORCE:
diff --git a/xen/Rules.mk b/xen/Rules.mk
index 57a0294555..70b7489ea8 100644
--- a/xen/Rules.mk
+++ b/xen/Rules.mk
@@ -37,7 +37,7 @@ SPECIAL_DATA_SECTIONS := rodata $(foreach a,1 2 4 8 16, \
$(foreach r,rel rel.ro,data.$(r).local)
# The filename build.mk has precedence over Makefile
-include $(firstword $(wildcard $(src)/build.mk) $(src)/Makefile)
+include $(firstword $(wildcard $(srcdir)/build.mk) $(srcdir)/Makefile)
# Linking
# ---------------------------------------------------------------------------
@@ -328,6 +328,15 @@ existing-targets := $(wildcard $(sort $(targets)))
-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
+# Create directories for object files if they do not exist
+obj-dirs := $(sort $(patsubst %/,%, $(dir $(targets))))
+# If targets exist, their directories apparently exist. Skip mkdir.
+existing-dirs := $(sort $(patsubst %/,%, $(dir $(existing-targets))))
+obj-dirs := $(strip $(filter-out $(existing-dirs), $(obj-dirs)))
+ifneq ($(obj-dirs),)
+$(shell mkdir -p $(obj-dirs))
+endif
+
# Declare the contents of the PHONY variable as phony. We keep that
# information in a variable so we can use it in if_changed and friends.
.PHONY: $(PHONY)
diff --git a/xen/arch/x86/arch.mk b/xen/arch/x86/arch.mk
index cfde143053..fce2ef5b67 100644
--- a/xen/arch/x86/arch.mk
+++ b/xen/arch/x86/arch.mk
@@ -77,6 +77,9 @@ ifneq ($(CONFIG_PV_SHIM_EXCLUSIVE),y)
efi-check := arch/x86/efi/check
+# Create the directory for out-of-tree build
+$(shell mkdir -p $(dir $(efi-check)))
+
# Check if the compiler supports the MS ABI.
XEN_BUILD_EFI := $(call if-success,$(CC) $(CFLAGS) -c
$(srctree)/$(efi-check).c -o $(efi-check).o,y)
@@ -116,4 +119,4 @@ export EFI_LDFLAGS
endif
# Set up the assembler include path properly for older toolchains.
-CFLAGS += -Wa,-I$(srctree)/include
+CFLAGS += -Wa,-I$(objtree)/include -Wa,-I$(srctree)/include
diff --git a/xen/arch/x86/boot/Makefile b/xen/arch/x86/boot/Makefile
index ca8001c72b..784655f5e2 100644
--- a/xen/arch/x86/boot/Makefile
+++ b/xen/arch/x86/boot/Makefile
@@ -7,11 +7,17 @@ targets += $(head-srcs:.S=.o)
head-srcs := $(addprefix $(obj)/, $(head-srcs))
+ifdef building_out_of_srctree
+$(obj)/head.o: CFLAGS-y += -iquote $(obj)
+endif
$(obj)/head.o: $(head-srcs)
CFLAGS_x86_32 := $(subst -m64,-m32 -march=i686,$(XEN_TREEWIDE_CFLAGS))
$(call cc-options-add,CFLAGS_x86_32,CC,$(EMBEDDED_EXTRA_CFLAGS))
CFLAGS_x86_32 += -Werror -fno-builtin -g0 -msoft-float
+ifdef building_out_of_srctree
+CFLAGS_x86_32 += -I$(objtree)/include
+endif
CFLAGS_x86_32 += -I$(srctree)/include
# override for 32bit binaries
diff --git a/xen/common/efi/efi-common.mk b/xen/common/efi/efi-common.mk
index 960d44a6d5..4298ceaee7 100644
--- a/xen/common/efi/efi-common.mk
+++ b/xen/common/efi/efi-common.mk
@@ -3,12 +3,13 @@ EFIOBJ-$(CONFIG_COMPAT) += compat.o
CFLAGS-y += -fshort-wchar
CFLAGS-y += -iquote $(srctree)/common/efi
+CFLAGS-y += -iquote $(srcdir)
# Part of the command line transforms $(obj)
# e.g.: It transforms "dir/foo/bar" into successively
# "dir foo bar", ".. .. ..", "../../.."
$(obj)/%.c: $(srctree)/common/efi/%.c FORCE
- $(Q)ln -nfs $(subst $(space),/,$(patsubst %,..,$(subst /,
,$(obj))))/common/efi/$(<F) $@
+ $(Q)ln -nfs $(subst $(space),/,$(patsubst %,..,$(subst /,
,$(obj))))/source/common/efi/$(<F) $@
clean-files += $(patsubst %.o, %.c, $(EFIOBJ-y:.init.o=.o) $(EFIOBJ-))
diff --git a/xen/include/Makefile b/xen/include/Makefile
index c8c4bcd93b..03baf10efb 100644
--- a/xen/include/Makefile
+++ b/xen/include/Makefile
@@ -115,7 +115,8 @@ $(obj)/headers99.chk: $(PUBLIC_C99_HEADERS)
$(srcdir)/Makefile
$(foreach i, $(filter %.h,$^), \
echo "#include "\"$(i)\" \
| $(CC) -x c -std=c99 -Wall -Werror \
- -include stdint.h $(foreach j, $($(i)-prereq), -include $(j).h) \
+ -include stdint.h \
+ $(foreach j, $($(patsubst $(srctree)/%,%,$i)-prereq), -include
$(j).h) \
-S -o /dev/null - \
|| exit $$?; echo $(i) >> $@.new;)
mv $@.new $@
@@ -129,8 +130,9 @@ $(obj)/headers++.chk: $(PUBLIC_HEADERS) $(srcdir)/Makefile
$(foreach i, $(filter %.h,$^), \
echo "#include "\"$(i)\" \
| $(CXX) -x c++ -std=gnu++98 -Wall -Werror -D__XEN_TOOLS__ \
- -include stdint.h -include $(src)/public/xen.h \
- $(foreach j, $($(i)-prereq), -include c$(j)) -S -o /dev/null - \
+ -include stdint.h -include $(srcdir)/public/xen.h \
+ $(foreach j, $($(patsubst $(srctree)/%,%,$i)-prereq), -include
c$(j)) \
+ -S -o /dev/null - \
|| exit $$?; echo $(i) >> $@.new;)
mv $@.new $@
@@ -139,7 +141,8 @@ endif
ifeq ($(XEN_TARGET_ARCH),x86_64)
.PHONY: lib-x86-all
lib-x86-all:
- $(MAKE) -C $(obj)/xen/lib/x86 all
+ @mkdir -p $(obj)/xen/lib/x86
+ $(MAKE) -C $(obj)/xen/lib/x86 -f
$(abs_srctree)/$(src)/xen/lib/x86/Makefile all
all: lib-x86-all
endif
diff --git a/xen/test/livepatch/Makefile b/xen/test/livepatch/Makefile
index ddb0737131..c258ab0b59 100644
--- a/xen/test/livepatch/Makefile
+++ b/xen/test/livepatch/Makefile
@@ -11,6 +11,8 @@ endif
CODE_ADDR=$(shell nm --defined $(1) | grep $(2) | awk '{print "0x"$$1}')
CODE_SZ=$(shell nm --defined -S $(1) | grep $(2) | awk '{ print "0x"$$2}')
+CFLAGS-y += -iquote $(obj)
+
extra-y += xen_hello_world.livepatch
xen_hello_world-objs := xen_hello_world_func.o xen_hello_world.o note.o
xen_note.o modinfo.o
$(obj)/xen_hello_world.o: $(obj)/config.h
diff --git a/xen/xsm/flask/Makefile b/xen/xsm/flask/Makefile
index a99038cb57..d25312f4fa 100644
--- a/xen/xsm/flask/Makefile
+++ b/xen/xsm/flask/Makefile
@@ -4,7 +4,8 @@ obj-y += flask_op.o
obj-y += ss/
-CFLAGS-y += -I$(obj)/include
+CFLAGS-y += -iquote $(obj)/include
+CFLAGS-y += -I$(srcdir)/include
AWK = awk
diff --git a/xen/xsm/flask/ss/Makefile b/xen/xsm/flask/ss/Makefile
index aba1339f38..ffe92ec19e 100644
--- a/xen/xsm/flask/ss/Makefile
+++ b/xen/xsm/flask/ss/Makefile
@@ -8,4 +8,5 @@ obj-y += services.o
obj-y += conditional.o
obj-y += mls.o
+CFLAGS-y += -iquote $(objtree)/xsm/flask/include
CFLAGS-y += -I$(srctree)/xsm/flask/include
--
generated by git-patchbot for /home/xen/git/xen.git#master
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