From dbeed3c767f9e051721a869a7ec244c5385e19de Mon Sep 17 00:00:00 2001
From: Jesse Vincent <jesse@keyboard.io>
Date: Sat, 26 Mar 2022 18:57:16 -0700
Subject: [PATCH] Apply some of our makefile optimization techniques to the
 test suite

---
 testing/makefiles/testcase.mk | 21 +++++++++++++++++++++
 tests/Makefile                | 21 ++++++++++++++++++++-
 2 files changed, 41 insertions(+), 1 deletion(-)

diff --git a/testing/makefiles/testcase.mk b/testing/makefiles/testcase.mk
index 9192fb77..99bce816 100644
--- a/testing/makefiles/testcase.mk
+++ b/testing/makefiles/testcase.mk
@@ -1,3 +1,24 @@
+# Reset a bunch of historical GNU make implicit rules that we never
+# use, but which have a disastrous impact on performance
+#
+# --no-builtin-rules in MAKEFLAGS apparently came in with GNU Make 4,
+# which is newer than what Apple ships
+MAKEFLAGS += --no-builtin-rules
+
+# These lines reset the implicit rules we really care about
+%:: %,v
+
+%:: RCS/%,v
+
+%:: RCS/%
+
+%:: s.%
+
+%:: SCCS/s.%
+
+.SUFFIXES:
+
+
 mkfile_dir 	:= $(dir $(lastword ${MAKEFILE_LIST}))
 top_dir         := $(abspath $(mkfile_dir)../..)
 
diff --git a/tests/Makefile b/tests/Makefile
index 28b0c12b..8859e323 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -1,3 +1,22 @@
+# Reset a bunch of historical GNU make implicit rules that we never
+# use, but which have a disastrous impact on performance
+#
+# --no-builtin-rules in MAKEFLAGS apparently came in with GNU Make 4,
+# which is newer than what Apple ships
+MAKEFLAGS += --no-builtin-rules
+
+# These lines reset the implicit rules we really care about
+%:: %,v
+
+%:: RCS/%,v
+
+%:: RCS/%
+
+%:: s.%
+
+%:: SCCS/s.%
+
+.SUFFIXES:
 
 tests_dir	:= $(abspath $(dir $(lastword ${MAKEFILE_LIST})))
 
@@ -13,7 +32,7 @@ TEST_PATH 	?= ./
 
 export FQBN	?= keyboardio:virtual:model01
 
-TESTS		?= $(shell cd $(tests_dir); find ${TEST_PATH} -name '*.ino' -exec dirname {} \;)
+TESTS		:= $(shell cd $(tests_dir); find ${TEST_PATH} -name '*.ino' -exec dirname {} \;)
 
 include $(top_dir)/etc/makefiles/arduino-cli.mk