build: Deactivate implicit build make(1) rules.

The new comment explains why.

diff --git a/Makefile b/Makefile
index a993946050cf437aba448c8ba4db646a543f0980..76ab5eb5a3192cd5daa72ceda4dc8fcd936ea7be 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,12 @@
+# Implicit rules are implemented in make as suffix rules. The following rule
+# empties the suffix list to disable the predefined implicit rules. This
+# increases performance and avoids hard-to-debug behaviour.
+.SUFFIXES:
+MAKEFLAGS += -Rr
+ifeq ("$(origin CC)", "default")
+       CC := cc
+endif
+
 # where to install
 PREFIX ?= /usr/local
 libdir := $(PREFIX)/lib