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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: reAwUggB1XXFnLyc+HCbkRQQrxrfJgk0scWrwWrs8TIcdDK8W0t/8JbO8ayP6fiGRLdKLr7PYH hJHHr9Jf/hlL9EOO3K86aUMylKAWESUQozzFqGpmM5w5O28gLX0cfwjw5+uWxPKx6bWQnL1may xjkVEvvJFqCW9mUUrzbYCEIlQc0PeQ2Jwg5BluT4oztSrd9y6/YtOX+gmCXoevsyOh802oFMGB ytvj7qKh0rnr7h9V2SJPUl80DmWAds1Yl3G/6zIAuFsVcX5U4azOXVE02QeOimFNLmNjtrjuZl JIQ= X-SBRS: 2.7 X-MesageID: 13658310 X-Ironport-Server: esa4.hc3370-68.iphmx.com X-Remote-IP: 162.221.158.21 X-Policy: $RELAYED X-IronPort-AV: E=Sophos;i="5.70,487,1574139600"; d="scan'208";a="13658310" From: Anthony PERARD To: Date: Wed, 26 Feb 2020 11:33:50 +0000 Message-ID: <20200226113355.2532224-19-anthony.perard@citrix.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200226113355.2532224-1-anthony.perard@citrix.com> References: <20200226113355.2532224-1-anthony.perard@citrix.com> MIME-Version: 1.0 Subject: [Xen-devel] [XEN PATCH v3 18/23] xen/build: use if_changed on built_in.o 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 , Konrad Rzeszutek Wilk , George Dunlap , Andrew Cooper , Ian Jackson , 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 --- xen/Rules.mk | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/xen/Rules.mk b/xen/Rules.mk index bb4ced5f0dd4..cbf4feba0e0f 100644 --- a/xen/Rules.mk +++ b/xen/Rules.mk @@ -126,14 +126,21 @@ include $(BASEDIR)/arch/$(TARGET_ARCH)/Rules.mk c_flags += $(CFLAGS-y) a_flags += $(CFLAGS-y) $(AFLAGS-y) -built_in.o: $(obj-y) $(extra-y) +quiet_cmd_ld_builtin = LD $@ +cmd_ld_builtin = \ + $(LD) $(XEN_LDFLAGS) -r -o $@ $(filter-out $(extra-y),$(real-prereqs)) +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),) - $(CC) $(c_flags) -c -x c /dev/null -o $@ + $(call if_changed,cc_builtin) else ifeq ($(CONFIG_LTO),y) $(LD_LTO) -r -o $@ $(filter-out $(extra-y),$^) else - $(LD) $(XEN_LDFLAGS) -r -o $@ $(filter-out $(extra-y),$^) + $(call if_changed,ld_builtin) endif endif