[PATCH 08/12] 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>
---
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(-)