Makefile: disable default implicit rules
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>
diff --git a/Makefile b/Makefile
index 1811a9e..8d3299a 100644
--- a/Makefile
+++ b/Makefile
@@ -1672,6 +1672,8 @@
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
