From patchwork Mon Sep 14 10:16:34 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jan Beulich X-Patchwork-Id: 11773485 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A91DC112E for ; Mon, 14 Sep 2020 10:17:33 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 8A3842076C for ; Mon, 14 Sep 2020 10:17:33 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8A3842076C Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kHlXU-0004T5-5s; Mon, 14 Sep 2020 10:16:48 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kHlXS-0004Sr-II for xen-devel@lists.xenproject.org; Mon, 14 Sep 2020 10:16:46 +0000 X-Inumbo-ID: 48365810-c609-455a-89fd-968abcadfb7a Received: from mx2.suse.de (unknown [195.135.220.15]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id 48365810-c609-455a-89fd-968abcadfb7a; Mon, 14 Sep 2020 10:16:35 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 4A302AD21; Mon, 14 Sep 2020 10:16:50 +0000 (UTC) Subject: [PATCH 3/9] lib: collect library files in an archive From: Jan Beulich To: "xen-devel@lists.xenproject.org" Cc: Andrew Cooper , George Dunlap , Ian Jackson , Julien Grall , Wei Liu , Stefano Stabellini , =?utf-8?q?Roger_Pau_Monn=C3=A9?= References: Message-ID: Date: Mon, 14 Sep 2020 12:16:34 +0200 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.12.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" In order to (subsequently) drop odd things like CONFIG_NEEDS_LIST_SORT just to avoid bloating binaries when only some arch-es and/or configurations need generic library routines, combine objects under lib/ into an archive, which the linker then can pick the necessary objects out of. Note that we can't use thin archives just yet, until we've raised the minimum required binutils version suitably. Signed-off-by: Jan Beulich --- xen/Rules.mk | 33 +++++++++++++++++++++++++++------ xen/arch/arm/Makefile | 6 +++--- xen/arch/x86/Makefile | 8 ++++---- xen/lib/Makefile | 3 ++- 4 files changed, 36 insertions(+), 14 deletions(-) diff --git a/xen/Rules.mk b/xen/Rules.mk index 333e19bec343..e59c7f213f77 100644 --- a/xen/Rules.mk +++ b/xen/Rules.mk @@ -41,12 +41,16 @@ ALL_OBJS-y += $(BASEDIR)/xsm/built_in.o ALL_OBJS-y += $(BASEDIR)/arch/$(TARGET_ARCH)/built_in.o ALL_OBJS-$(CONFIG_CRYPTO) += $(BASEDIR)/crypto/built_in.o +ALL_LIBS-y := $(BASEDIR)/lib/lib.a + # Initialise some variables +lib-y := targets := CFLAGS-y := AFLAGS-y := ALL_OBJS := $(ALL_OBJS-y) +ALL_LIBS := $(ALL_LIBS-y) SPECIAL_DATA_SECTIONS := rodata $(foreach a,1 2 4 8 16, \ $(foreach w,1 2 4, \ @@ -60,7 +64,14 @@ include Makefile # --------------------------------------------------------------------------- quiet_cmd_ld = LD $@ -cmd_ld = $(LD) $(XEN_LDFLAGS) -r -o $@ $(real-prereqs) +cmd_ld = $(LD) $(XEN_LDFLAGS) -r -o $@ $(filter-out %.a,$(real-prereqs)) \ + --start-group $(filter %.a,$(real-prereqs)) --end-group + +# Archive +# --------------------------------------------------------------------------- + +quiet_cmd_ar = AR $@ +cmd_ar = rm -f $@; $(AR) cPrs $@ $(real-prereqs) # Objcopy # --------------------------------------------------------------------------- @@ -86,6 +97,10 @@ obj-y := $(patsubst %/, %/built_in.o, $(obj-y)) # tell kbuild to descend subdir-obj-y := $(filter %/built_in.o, $(obj-y)) +# Libraries are always collected in one lib file. +# Filter out objects already built-in +lib-y := $(filter-out $(obj-y), $(sort $(lib-y))) + $(filter %.init.o,$(obj-y) $(obj-bin-y) $(extra-y)): CFLAGS-y += -DINIT_SECTIONS_ONLY ifeq ($(CONFIG_COVERAGE),y) @@ -129,19 +144,25 @@ include $(BASEDIR)/arch/$(TARGET_ARCH)/Rules.mk c_flags += $(CFLAGS-y) a_flags += $(CFLAGS-y) $(AFLAGS-y) -built_in.o: $(obj-y) $(extra-y) +built_in.o: $(obj-y) $(if $(strip $(lib-y)),lib.a) $(extra-y) ifeq ($(obj-y),) $(CC) $(c_flags) -c -x c /dev/null -o $@ else ifeq ($(CONFIG_LTO),y) - $(LD_LTO) -r -o $@ $(filter-out $(extra-y),$^) + $(LD_LTO) -r -o $@ $(filter-out lib.a $(extra-y),$^) else - $(LD) $(XEN_LDFLAGS) -r -o $@ $(filter-out $(extra-y),$^) + $(LD) $(XEN_LDFLAGS) -r -o $@ $(filter-out lib.a $(extra-y),$^) endif endif +lib.a: $(lib-y) FORCE + $(call if_changed,ar) + targets += built_in.o -targets += $(filter-out $(subdir-obj-y), $(obj-y)) $(extra-y) +ifneq ($(strip $(lib-y)),) +targets += lib.a +endif +targets += $(filter-out $(subdir-obj-y), $(obj-y) $(lib-y)) $(extra-y) targets += $(MAKECMDGOALS) built_in_bin.o: $(obj-bin-y) $(extra-y) @@ -155,7 +176,7 @@ endif PHONY += FORCE FORCE: -%/built_in.o: FORCE +%/built_in.o %/lib.a: FORCE $(MAKE) -f $(BASEDIR)/Rules.mk -C $* built_in.o %/built_in_bin.o: FORCE diff --git a/xen/arch/arm/Makefile b/xen/arch/arm/Makefile index 296c5e68bbc3..612a83b315c8 100644 --- a/xen/arch/arm/Makefile +++ b/xen/arch/arm/Makefile @@ -90,14 +90,14 @@ endif ifeq ($(CONFIG_LTO),y) # Gather all LTO objects together -prelink_lto.o: $(ALL_OBJS) - $(LD_LTO) -r -o $@ $^ +prelink_lto.o: $(ALL_OBJS) $(ALL_LIBS) + $(LD_LTO) -r -o $@ $(filter-out %.a,$^) --start-group $(filter %.a,$^) --end-group # Link it with all the binary objects prelink.o: $(patsubst %/built_in.o,%/built_in_bin.o,$(ALL_OBJS)) prelink_lto.o $(call if_changed,ld) else -prelink.o: $(ALL_OBJS) FORCE +prelink.o: $(ALL_OBJS) $(ALL_LIBS) FORCE $(call if_changed,ld) endif diff --git a/xen/arch/x86/Makefile b/xen/arch/x86/Makefile index 9b368632fb43..8f2180485b2b 100644 --- a/xen/arch/x86/Makefile +++ b/xen/arch/x86/Makefile @@ -132,8 +132,8 @@ EFI_OBJS-$(XEN_BUILD_EFI) := efi/relocs-dummy.o ifeq ($(CONFIG_LTO),y) # Gather all LTO objects together -prelink_lto.o: $(ALL_OBJS) - $(LD_LTO) -r -o $@ $^ +prelink_lto.o: $(ALL_OBJS) $(ALL_LIBS) + $(LD_LTO) -r -o $@ $(filter-out %.a,$^) --start-group $(filter %.a,$^) --end-group # Link it with all the binary objects prelink.o: $(patsubst %/built_in.o,%/built_in_bin.o,$(ALL_OBJS)) prelink_lto.o $(EFI_OBJS-y) FORCE @@ -142,10 +142,10 @@ prelink.o: $(patsubst %/built_in.o,%/built_in_bin.o,$(ALL_OBJS)) prelink_lto.o $ prelink-efi.o: $(patsubst %/built_in.o,%/built_in_bin.o,$(ALL_OBJS)) prelink_lto.o FORCE $(call if_changed,ld) else -prelink.o: $(ALL_OBJS) $(EFI_OBJS-y) FORCE +prelink.o: $(ALL_OBJS) $(ALL_LIBS) $(EFI_OBJS-y) FORCE $(call if_changed,ld) -prelink-efi.o: $(ALL_OBJS) FORCE +prelink-efi.o: $(ALL_OBJS) $(ALL_LIBS) FORCE $(call if_changed,ld) endif diff --git a/xen/lib/Makefile b/xen/lib/Makefile index 53b1da025e0d..b8814361d63e 100644 --- a/xen/lib/Makefile +++ b/xen/lib/Makefile @@ -1,2 +1,3 @@ -obj-y += ctype.o obj-$(CONFIG_X86) += x86/ + +lib-y += ctype.o