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client-ip=162.221.158.21; receiver=esa4.hc3370-68.iphmx.com; envelope-from="anthony.perard@citrix.com"; x-sender="postmaster@mail.citrix.com"; x-conformance=sidf_compatible IronPort-SDR: Gk7xBkDrgkEf1i9W3J69/g+xQZ72ufhT5RhktDe0S/j93oin1DJRXPTvKTLC+lD+6vInav5hKc rus9WLFzapszJd04+vIEb6d9FnI9B/LyoYi2/axsi7sBqbEY2m8VAP5+f289OGEDGmDidJgSvt E79+aFIlQ2Z4JhlGaf56H6yawtpTeCIhDzii1VVNtqqpPQKQ6ILiJIzIkxcEEw3eFuHrPCWkFg ufhMdGtYltYOHwmG7EbfPrNZh40+zxKoAAZ8psUjryLyM0L2H0Mh0kkqdk9CxdBk3hn4b2F6/k IpY= X-SBRS: 2.7 X-MesageID: 16692953 X-Ironport-Server: esa4.hc3370-68.iphmx.com X-Remote-IP: 162.221.158.21 X-Policy: $RELAYED X-IronPort-AV: E=Sophos;i="5.72,410,1580792400"; d="scan'208";a="16692953" From: Anthony PERARD To: Subject: [XEN PATCH v5 09/16] xen/build: use if_changed on built_in.o Date: Tue, 21 Apr 2020 17:12:01 +0100 Message-ID: <20200421161208.2429539-10-anthony.perard@citrix.com> X-Mailer: git-send-email 2.26.1 In-Reply-To: <20200421161208.2429539-1-anthony.perard@citrix.com> References: <20200421161208.2429539-1-anthony.perard@citrix.com> MIME-Version: 1.0 X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Stefano Stabellini , Julien Grall , Wei Liu , Andrew Cooper , Ian Jackson , George Dunlap , Jan Beulich , Anthony PERARD Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" In the case where $(obj-y) is empty, we also replace $(c_flags) by $(XEN_CFLAGS) to avoid generating an .%.d dependency file. This avoid make trying to include %.h file in the ld command if $(obj-y) isn't empty anymore on a second run. Signed-off-by: Anthony PERARD Acked-by: Jan Beulich --- Notes: v4: - Have cmd_ld_builtin depends on CONFIG_LTO, which simplify built_in.o rule. xen/Rules.mk | 21 +++++++++++++++------ 1 file changed, 15 insertions(+), 6 deletions(-) diff --git a/xen/Rules.mk b/xen/Rules.mk index 25bcf45612bd..5e08e14455d7 100644 --- a/xen/Rules.mk +++ b/xen/Rules.mk @@ -130,15 +130,24 @@ include $(BASEDIR)/arch/$(TARGET_ARCH)/Rules.mk c_flags += $(CFLAGS-y) a_flags += $(CFLAGS-y) $(AFLAGS-y) -built_in.o: $(obj-y) $(extra-y) -ifeq ($(obj-y),) - $(CC) $(c_flags) -c -x c /dev/null -o $@ -else +quiet_cmd_ld_builtin = LD $@ ifeq ($(CONFIG_LTO),y) - $(LD_LTO) -r -o $@ $(filter-out $(extra-y),$^) +cmd_ld_builtin = \ + $(LD_LTO) -r -o $@ $(filter-out $(extra-y),$(real-prereqs)) else - $(LD) $(XEN_LDFLAGS) -r -o $@ $(filter-out $(extra-y),$^) +cmd_ld_builtin = \ + $(LD) $(XEN_LDFLAGS) -r -o $@ $(filter-out $(extra-y),$(real-prereqs)) endif + +quiet_cmd_cc_builtin = LD $@ +cmd_cc_builtin = \ + $(CC) $(XEN_CFLAGS) -c -x c /dev/null -o $@ + +built_in.o: $(obj-y) $(extra-y) FORCE +ifeq ($(obj-y),) + $(call if_changed,cc_builtin) +else + $(call if_changed,ld_builtin) endif targets += built_in.o