virtio-blk: Avoid zeroing every request structure

[qemu.git] / rules.mak

diff --git a/rules.mak b/rules.mak
index 16713bacd75601385738f442a8fb276270953d4a..7e10432596dd23f9374a0afc4a2017cbd7b7326c 100644 (file)
--- a/rules.mak
+++ b/rules.mak
@@ -14,7 +14,7 @@ MAKEFLAGS += -rR
 # Flags for dependency generation
 QEMU_DGFLAGS += -MMD -MP -MT $@
 
-%.o: %.c $(GENERATED_HEADERS)
+%.o: %.c
        $(call quiet-command,$(CC) $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) -c -o $@ $<,"  CC    $(TARGET_DIR)$@")
 
 %.o: %.S
@@ -23,7 +23,7 @@ QEMU_DGFLAGS += -MMD -MP -MT $@
 %.o: %.m
        $(call quiet-command,$(CC) $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) -c -o $@ $<,"  OBJC  $(TARGET_DIR)$@")
 
-LINK = $(call quiet-command,$(CC) $(QEMU_CFLAGS) $(CFLAGS) $(LDFLAGS) -o $@ $(1) $(ARLIBS_BEGIN) $(ARLIBS) $(ARLIBS_END) $(LIBS),"  LINK  $(TARGET_DIR)$@")
+LINK = $(call quiet-command,$(CC) $(QEMU_CFLAGS) $(CFLAGS) $(LDFLAGS) -o $@ $(1) $(LIBS),"  LINK  $(TARGET_DIR)$@")
 
 %$(EXESUF): %.o
        $(call LINK,$^)
@@ -39,6 +39,9 @@ quiet-command = $(if $(V),$1,$(if $(2),@echo $2 && $1, @$1))
 cc-option = $(if $(shell $(CC) $1 $2 -S -o /dev/null -xc /dev/null \
               >/dev/null 2>&1 && echo OK), $2, $3)
 
+VPATH_SUFFIXES = %.c %.h %.S %.m %.mak %.texi
+set-vpath = $(if $1,$(foreach PATTERN,$(VPATH_SUFFIXES),$(eval vpath $(PATTERN) $1)))
+
 # Generate timestamp files for .h include files
 
 %.h: %.h-timestamp
@@ -47,3 +50,6 @@ cc-option = $(if $(shell $(CC) $1 $2 -S -o /dev/null -xc /dev/null \
 %.h-timestamp: %.mak
        $(call quiet-command, sh $(SRC_PATH)/create_config < $< > $@, "  GEN   $*.h")
        @cmp $@ $*.h >/dev/null 2>&1 || cp $@ $*.h
+
+# will delete the target of a rule if commands exit with a nonzero exit status
+.DELETE_ON_ERROR: