From: Anthony PERARD <anthony.perard@citrix.com>
To: Jan Beulich <jbeulich@suse.com>
Cc: xen-devel@lists.xenproject.org,
"Andrew Cooper" <andrew.cooper3@citrix.com>,
"George Dunlap" <george.dunlap@citrix.com>,
"Ian Jackson" <iwj@xenproject.org>,
"Julien Grall" <julien@xen.org>,
"Stefano Stabellini" <sstabellini@kernel.org>,
"Wei Liu" <wl@xen.org>,
"Volodymyr Babchuk" <Volodymyr_Babchuk@epam.com>,
"Bertrand Marquis" <bertrand.marquis@arm.com>,
"Roger Pau Monné" <roger.pau@citrix.com>
Subject: Re: [XEN PATCH v8 07/47] build: set ALL_OBJS to main Makefile; move prelink.o to main Makefile
Date: Tue, 7 Dec 2021 11:23:47 +0000 [thread overview]
Message-ID: <Ya9EQwNETQ6BPlma@perard> (raw)
In-Reply-To: <b4bde105-094d-067a-4657-a7ff041aee4a@suse.com>
On Mon, Dec 06, 2021 at 05:52:51PM +0100, Jan Beulich wrote:
> On 25.11.2021 14:39, Anthony PERARD wrote:
>
> Nit: In the title, do you mean "set ALL_OBJS in main Makefile; ..."?
>
> > --- a/xen/Makefile
> > +++ b/xen/Makefile
> > @@ -285,8 +285,21 @@ CFLAGS += -flto
> > LDFLAGS-$(CONFIG_CC_IS_CLANG) += -plugin LLVMgold.so
> > endif
> >
> > +# Note that link order matters!
> > +ALL_OBJS-y := common/built_in.o
> > +ALL_OBJS-y += drivers/built_in.o
> > +ALL_OBJS-y += lib/built_in.o
> > +ALL_OBJS-y += xsm/built_in.o
> > +ALL_OBJS-y += arch/$(TARGET_ARCH)/built_in.o
> > +ALL_OBJS-$(CONFIG_CRYPTO) += crypto/built_in.o
> > +
> > +ALL_LIBS-y := lib/lib.a
> > +
> > include $(BASEDIR)/arch/$(TARGET_ARCH)/arch.mk
> >
> > +export ALL_OBJS := $(ALL_OBJS-y)
> > +export ALL_LIBS := $(ALL_LIBS-y)
>
> Who's the consumer of these exports? I ask because I don't consider the
> names very suitable for exporting, and hence I'd prefer to see their
> scope limited. If e.g. it's only a single make invocation where they
> need propagating, doing so on the command line might be better.
There seems to be only one consumer, "build.mk", and only the last
$(MAKE) call in the recipe "$(TARGET)". So, it's probably fine to set
both on the command line instead of using export. I'll have a look.
> > --- a/xen/arch/arm/Rules.mk
> > +++ b/xen/arch/arm/Rules.mk
> > @@ -0,0 +1,5 @@
> > +# head.o is built by descending into arch/arm/$(TARGET_SUBARCH), depends on the
> > +# part of $(ALL_OBJS) that will eventually recurse into $(TARGET_SUBARCH)/ and
> > +# build head.o
> > +arch/arm/$(TARGET_SUBARCH)/head.o: arch/arm/built_in.o
> > +arch/arm/$(TARGET_SUBARCH)/head.o: ;
>
> Can't this be a single line:
>
> arch/arm/$(TARGET_SUBARCH)/head.o: arch/arm/built_in.o ;
Sure.
> > @@ -235,7 +218,7 @@ $(TARGET).efi: FORCE
> > echo '$(if $(filter y,$(XEN_BUILD_EFI)),xen.efi generation,EFI support) disabled'
> > endif
> >
> > -efi/buildid.o efi/relocs-dummy.o: $(BASEDIR)/arch/x86/efi/built_in.o
> > +# These should already have been rebuilt when building the prerequisite of "prelink.o"
> > efi/buildid.o efi/relocs-dummy.o: ;
>
> If the comment is true in all cases, do they really still need an empty
> rule?
Yes. Those two targets are unfortunately a prerequisite of "xen.efi", so
make will look for a rule to make them, and would use %.o:%.c without
this explicit rule.
Thanks,
--
Anthony PERARD
next prev parent reply other threads:[~2021-12-07 11:24 UTC|newest]
Thread overview: 110+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-25 13:39 [XEN PATCH v8 00/47] xen: Build system improvements, now with out-of-tree build! Anthony PERARD
2021-11-25 13:39 ` [XEN PATCH v8 01/47] build: factorise generation of the linker scripts Anthony PERARD
2021-12-14 16:54 ` Julien Grall
2021-12-14 17:09 ` Anthony PERARD
2021-12-14 17:12 ` Julien Grall
2021-11-25 13:39 ` [XEN PATCH v8 02/47] xen: move include/asm-* to arch/*/include/asm Anthony PERARD
2021-12-02 13:54 ` Jan Beulich
2021-12-14 16:59 ` Julien Grall
2021-12-14 17:39 ` Andrew Cooper
2021-11-25 13:39 ` [XEN PATCH v8 03/47] build: generate "include/xen/compile.h" with if_changed Anthony PERARD
2021-12-02 13:57 ` Jan Beulich
2021-11-25 13:39 ` [XEN PATCH v8 04/47] build: set XEN_BUILD_EFI earlier Anthony PERARD
2021-12-02 14:06 ` Jan Beulich
2021-12-07 11:04 ` Anthony PERARD
2021-12-07 11:24 ` Jan Beulich
2021-11-25 13:39 ` [XEN PATCH v8 05/47] build: adjust $(TARGET).efi creation in arch/arm Anthony PERARD
2021-12-14 17:01 ` Julien Grall
2021-11-25 13:39 ` [XEN PATCH v8 06/47] build: avoid re-executing the main Makefile by introducing build.mk Anthony PERARD
2021-12-06 16:42 ` Jan Beulich
2021-11-25 13:39 ` [XEN PATCH v8 07/47] build: set ALL_OBJS to main Makefile; move prelink.o to main Makefile Anthony PERARD
2021-12-06 16:52 ` Jan Beulich
2021-12-07 11:23 ` Anthony PERARD [this message]
2021-11-25 13:39 ` [XEN PATCH v8 08/47] build: prepare to always invoke $(MAKE) from xen/, use $(obj) Anthony PERARD
2021-12-14 17:02 ` Julien Grall
2021-11-25 13:39 ` [XEN PATCH v8 09/47] build: rework test/livepatch/Makefile Anthony PERARD
2021-12-06 17:00 ` Jan Beulich
2021-11-25 13:39 ` [XEN PATCH v8 10/47] build: rework cloc recipe Anthony PERARD
2021-12-06 17:03 ` Jan Beulich
2021-11-25 13:39 ` [XEN PATCH v8 11/47] build: fix enforce unique symbols for recent clang version Anthony PERARD
2021-12-07 10:23 ` Jan Beulich
2021-12-07 11:33 ` Anthony PERARD
2021-11-25 13:39 ` [XEN PATCH v8 12/47] build: build everything from the root dir, use obj=$subdir Anthony PERARD
2021-12-07 11:10 ` Jan Beulich
2021-12-16 11:08 ` Anthony PERARD
2021-12-20 11:29 ` Anthony PERARD
2021-12-21 7:55 ` Jan Beulich
2021-12-21 9:30 ` Anthony PERARD
2021-12-14 17:03 ` Julien Grall
2021-11-25 13:39 ` [XEN PATCH v8 13/47] build: introduce if_changed_deps Anthony PERARD
2021-11-25 13:39 ` [XEN PATCH v8 14/47] build: rename __LINKER__ to LINKER_SCRIPT Anthony PERARD
2021-12-14 17:05 ` Julien Grall
2021-12-15 7:49 ` Jan Beulich
2021-12-15 9:20 ` Julien Grall
2021-11-25 13:39 ` [XEN PATCH v8 15/47] build: hook kconfig into xen build system Anthony PERARD
2021-11-25 13:39 ` [XEN PATCH v8 16/47] xen/tools/kconfig: fix build with -Wdeclaration-after-statement Anthony PERARD
2021-12-07 11:20 ` Jan Beulich
2021-11-25 13:39 ` [XEN PATCH v8 17/47] build: remove KBUILD_ specific from Makefile.host Anthony PERARD
2021-11-25 13:39 ` [XEN PATCH v8 18/47] build: handle always-y and hostprogs-always-y Anthony PERARD
2021-11-25 13:39 ` [XEN PATCH v8 19/47] build: start building the tools with the main makefiles Anthony PERARD
2021-11-25 13:39 ` [XEN PATCH v8 20/47] build: add headers path to CFLAGS once for all archs Anthony PERARD
2021-12-14 17:06 ` Julien Grall
2021-11-25 13:39 ` [XEN PATCH v8 21/47] build: generate x86's asm-macros.h with filechk Anthony PERARD
2021-11-25 13:39 ` [XEN PATCH v8 22/47] build: clean-up "clean" rules of duplication Anthony PERARD
2021-12-14 17:07 ` Julien Grall
2021-11-25 13:39 ` [XEN PATCH v8 23/47] build: rework "clean" to clean from the root dir Anthony PERARD
2021-12-10 13:29 ` Jan Beulich
2021-11-25 13:39 ` [XEN PATCH v8 24/47] build: use main rune to build host binary x86's mkelf32 and mkreloc Anthony PERARD
2021-11-25 13:39 ` [XEN PATCH v8 25/47] build: rework coverage and ubsan CFLAGS handling Anthony PERARD
2021-11-25 13:39 ` [XEN PATCH v8 26/47] build,x86: remove the need for build32.mk Anthony PERARD
2021-12-21 13:33 ` Jan Beulich
2022-01-18 10:50 ` Anthony PERARD
2022-01-18 13:44 ` Jan Beulich
2021-11-25 13:39 ` [XEN PATCH v8 27/47] build: grab common EFI source files in arch specific dir Anthony PERARD
2021-12-21 13:53 ` Jan Beulich
2022-01-18 11:06 ` Anthony PERARD
2022-01-18 13:49 ` Jan Beulich
2022-01-18 16:49 ` Anthony PERARD
2022-01-18 16:21 ` Anthony PERARD
2022-01-19 7:46 ` Jan Beulich
2022-01-20 10:16 ` Anthony PERARD
2021-11-25 13:39 ` [XEN PATCH v8 28/47] build: replace $(BASEDIR) by $(objtree) Anthony PERARD
2021-12-21 13:55 ` Jan Beulich
2021-11-25 13:39 ` [XEN PATCH v8 29/47] build: replace $(BASEDIR) and use $(srctree) Anthony PERARD
2021-12-21 14:00 ` Jan Beulich
2021-11-25 13:39 ` [XEN PATCH v8 30/47] build: rework "headers*.chk" prerequisite in include/ Anthony PERARD
2021-12-21 14:07 ` Jan Beulich
2022-01-18 11:41 ` Anthony PERARD
2021-11-25 13:39 ` [XEN PATCH v8 31/47] build: specify source tree in include/ for prerequisite Anthony PERARD
2021-12-21 14:16 ` Jan Beulich
2022-01-18 12:14 ` Anthony PERARD
2021-11-25 13:39 ` [XEN PATCH v8 32/47] build: shuffle main Makefile Anthony PERARD
2021-12-21 14:18 ` Jan Beulich
2022-01-20 17:27 ` Anthony PERARD
2021-11-25 13:39 ` [XEN PATCH v8 33/47] build: adding out-of-tree support to the xen build Anthony PERARD
2022-01-10 11:26 ` Jan Beulich
2021-11-25 13:39 ` [XEN PATCH v8 34/47] build: add %.E targets Anthony PERARD
2021-12-16 11:18 ` Andrew Cooper
2021-12-16 11:56 ` Anthony PERARD
2021-12-21 14:20 ` Jan Beulich
2021-11-25 13:39 ` [XEN PATCH v8 35/47] RFC, no-VPATH: Kconfig: tell where Kconfig files are Anthony PERARD
2021-11-25 13:39 ` [XEN PATCH v8 36/47] RFC, no-VPATH: Kconfig: only ready auto.conf from objtree Anthony PERARD
2021-12-21 14:23 ` Jan Beulich
2021-12-21 15:12 ` Anthony PERARD
2021-11-25 13:39 ` [XEN PATCH v8 37/47] RFC, no-VPATH: build: remove --include-dir option from MAKEFLAGS Anthony PERARD
2021-11-25 13:39 ` [XEN PATCH v8 38/47] WIP, no-VPATH: rework Makefile.host Anthony PERARD
2021-11-25 13:39 ` [XEN PATCH v8 39/47] RFC, no-VPATH: x86/boot: workaround gcc including the wrong file Anthony PERARD
2021-11-25 13:39 ` [XEN PATCH v8 40/47] RFC, no-VPATH: prepend $(srctree) to source prerequisite Anthony PERARD
2021-11-25 13:40 ` [XEN PATCH v8 41/47] WIP, no-VPATH: build object from generated C files Anthony PERARD
2021-11-25 13:40 ` [XEN PATCH v8 42/47] RFC, no-VPATH: workaround includes in xsm/flask Anthony PERARD
2021-11-25 13:40 ` [XEN PATCH v8 43/47] WIP, no-VPATH: build object from generated assembly source file Anthony PERARD
2021-11-25 13:40 ` [XEN PATCH v8 44/47] WIP, no-VPATH: build object from S source to be in build_in.o Anthony PERARD
2021-11-25 13:40 ` [XEN PATCH v8 45/47] WIP, no-VPATH: build xen, out-of-tree! Anthony PERARD
2021-11-25 13:40 ` [XEN PATCH v8 46/47] RFC, no-VPATH: remove check for clean source tree for out-of-tree builds Anthony PERARD
2021-11-25 13:40 ` [XEN PATCH v8 47/47] WIP: no more link farming for xen-shim Anthony PERARD
2021-12-21 15:26 ` [XEN PATCH v8 00/47] xen: Build system improvements, now with out-of-tree build! Jan Beulich
2022-01-10 11:19 ` Jan Beulich
2022-01-18 10:33 ` Anthony PERARD
2022-01-21 6:59 ` Jan Beulich
2022-01-21 10:34 ` Anthony PERARD
2022-01-21 10:58 ` Jan Beulich
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