[PATCH 09/12] Makefile: list generated object files in OBJECTS

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Set the OBJECTS variable to a comprehensive list of all object
file targets.  To make sure it is truly comprehensive, restrict
the scope of the %.o pattern rule to only generate objects in
this list.

Attempts to build other object files will fail loudly:

	$ touch foo.c
	$ make foo.o
	make: *** No rule to make target `foo.o'.  Stop.

providing a reminder to add the new object to the OBJECTS list.

The new variable is otherwise unused.  The intent is for later
patches to take advantage of it.

Signed-off-by: Jonathan Nieder <jrnieder@xxxxxxxxx>
---
 Makefile |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index 60ef711..0e4e8ff 100644
--- a/Makefile
+++ b/Makefile
@@ -1671,14 +1671,19 @@ GIT_OBJS := $(LIB_OBJS) $(BUILTIN_OBJS) $(TEST_OBJS) \
 	$(patsubst git-%$X,%.o,$(PROGRAMS))
 XDIFF_OBJS = xdiff/xdiffi.o xdiff/xprepare.o xdiff/xutils.o xdiff/xemit.o \
 	xdiff/xmerge.o xdiff/xpatience.o
+OBJECTS := $(GIT_OBJS) $(XDIFF_OBJS)
+
+ASM_SRC := $(wildcard $(OBJECTS:o=S))
+ASM_OBJ := $(ASM_SRC:S=o)
+C_OBJ := $(filter-out $(ASM_OBJ),$(OBJECTS))
 
 .SUFFIXES:
 
-%.o: %.c GIT-CFLAGS
+$(C_OBJ): %.o: %.c GIT-CFLAGS
 	$(QUIET_CC)$(CC) -o $*.o -c $(ALL_CFLAGS) $<
 %.s: %.c GIT-CFLAGS FORCE
 	$(QUIET_CC)$(CC) -S $(ALL_CFLAGS) $<
-%.o: %.S GIT-CFLAGS
+$(ASM_OBJ): %.o: %.S GIT-CFLAGS
 	$(QUIET_CC)$(CC) -o $*.o -c $(ALL_CFLAGS) $<
 
 $(GIT_OBJS): $(LIB_H)
-- 
1.6.6

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