[PATCH 08/12] Makefile: disable default implicit rules

[Jonathan Nieder <jrnieder@gmail.com>]

The git makefile never uses any default implicit rules.
Unfortunately, if a prerequisite for one of the intended rules is
missing, a default rule can be used in its place:

	$ make var.s
	    CC var.s
	$ rm var.c
	$ make var.o
	    as   -o var.o var.s

Avoiding the default rules avoids this hard-to-debug behavior.
It also should speed things up a little in the normal case.

Future patches may restrict the scope of the %.o: %.c pattern.
This patch would then ensure that for targets not listed, we do
not fall back to the default rule.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
---
Sadly, this does not really speed things up in the normal case.
I am not sure why, but make needs the -r option to avoid
considering the default rules, even though clearing the .SUFFIXES:
guarantees it will never use them.

 Makefile |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/Makefile b/Makefile
index 84ce137..60ef711 100644
--- a/Makefile
+++ b/Makefile
@@ -1672,6 +1672,8 @@ GIT_OBJS := $(LIB_OBJS) $(BUILTIN_OBJS) $(TEST_OBJS) \
 XDIFF_OBJS = xdiff/xdiffi.o xdiff/xprepare.o xdiff/xutils.o xdiff/xemit.o \
 	xdiff/xmerge.o xdiff/xpatience.o
 
+.SUFFIXES:
+
 %.o: %.c GIT-CFLAGS
 	$(QUIET_CC)$(CC) -o $*.o -c $(ALL_CFLAGS) $<
 %.s: %.c GIT-CFLAGS FORCE
-- 
1.6.6