From 637ab36596a6122a4c034d4368d0c98e568bf6de Mon Sep 17 00:00:00 2001
From: Andre Noll <maan@tuebingen.mpg.de>
Date: Wed, 17 Jun 2020 20:02:26 +0200
Subject: [PATCH] build: Deactivate implicit build make(1) rules.

The new comment explains why.
---
 Makefile | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Makefile b/Makefile
index a993946..76ab5eb 100644
--- 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
-- 
2.39.2