From: Anthony PERARD <anthony.perard@citrix.com>
Date: Tue, 7 Sep 2021 07:16:45 +0000 (+0200)
Subject: build: use if_changed_rule with %.o:%.c targets
X-Git-Tag: archive/raspbian/4.16.0+51-g0941d6cb-1+rpi1~2^2~42^2~236
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=332c735d24387152e8f578e38066b5d03803c2a2;p=xen.git

build: use if_changed_rule with %.o:%.c targets

Use $(dot-target) to have the target name prefix with a dot.

Now, when the CC command has run, it is recorded in .*.cmd
file, then if_changed_rules will compare it on subsequent runs.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
---

diff --git a/xen/Rules.mk b/xen/Rules.mk
index a715a4525e..11c253026b 100644
--- a/xen/Rules.mk
+++ b/xen/Rules.mk
@@ -192,19 +192,27 @@ FORCE:
 
 SRCPATH := $(patsubst $(BASEDIR)/%,%,$(CURDIR))
 
-%.o: %.c Makefile
+quiet_cmd_cc_o_c = CC      $@
 ifeq ($(CONFIG_ENFORCE_UNIQUE_SYMBOLS),y)
-	$(CC) $(c_flags) -c $< -o $(@D)/.$(@F).tmp -MQ $@
-ifeq ($(CONFIG_CC_IS_CLANG),y)
-	$(OBJCOPY) --redefine-sym $<=$(SRCPATH)/$< $(@D)/.$(@F).tmp $@
-else
-	$(OBJCOPY) --redefine-sym $(<F)=$(SRCPATH)/$< $(@D)/.$(@F).tmp $@
-endif
-	rm -f $(@D)/.$(@F).tmp
+    cmd_cc_o_c = $(CC) $(c_flags) -c $< -o $(dot-target).tmp -MQ $@
+    ifeq ($(CONFIG_CC_IS_CLANG),y)
+        cmd_objcopy_fix_sym = $(OBJCOPY) --redefine-sym $<=$(SRCPATH)/$< $(dot-target).tmp $@
+    else
+        cmd_objcopy_fix_sym = $(OBJCOPY) --redefine-sym $(<F)=$(SRCPATH)/$< $(dot-target).tmp $@
+    endif
+    cmd_objcopy_fix_sym += && rm -f $(dot-target).tmp
 else
-	$(CC) $(c_flags) -c $< -o $@
+    cmd_cc_o_c = $(CC) $(c_flags) -c $< -o $@
 endif
 
+define rule_cc_o_c
+    $(call cmd_and_record,cc_o_c)
+    $(call cmd,objcopy_fix_sym)
+endef
+
+%.o: %.c FORCE
+	$(call if_changed_rule,cc_o_c)
+
 quiet_cmd_cc_o_S = CC      $@
 cmd_cc_o_S = $(CC) $(a_flags) -c $< -o $@