From c55d0dcd6182983521d4ab34478cfe4b093edb12 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jean-S=C3=A9bastien=20P=C3=A9dron?=
 <jean-sebastien.pedron@dumbbell.fr>
Date: Fri, 3 Apr 2020 12:29:44 +0200
Subject: core/test.mk: Rebuild out-of-date test modules only

... instead of always rebuilding all of them each time a testsuite is
executed.

The only exception is when a Makefile was modified: like for main
source files, test modules are all recompiled in this case.
---
 test/core_app.mk | 45 ++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 44 insertions(+), 1 deletion(-)

(limited to 'test/core_app.mk')

diff --git a/test/core_app.mk b/test/core_app.mk
index 553f331..7abb9e9 100644
--- a/test/core_app.mk
+++ b/test/core_app.mk
@@ -1682,7 +1682,7 @@ core-app-yrl-header: init
 	$t mkdir $(APP)/
 	$t cp ../erlang.mk $(APP)/
 	$t $(MAKE) -C $(APP) -f erlang.mk bootstrap-lib $v
-	
+
 	$i "Create a .yrl file"
 	$t echo "Nonterminals E T F." > $(APP)/src/y_parse.yrl
 	$t echo "Terminals '+' '*' '(' ')' number." >> $(APP)/src/y_parse.yrl
@@ -2743,3 +2743,46 @@ endif
 			= application:get_key(my_app, modules), \
 		[{module, M} = code:load_file(M) || M <- Mods], \
 		halt()"
+
+core-app-test-build-outofdate-files-only: init
+
+	$i "Bootstrap a new OTP library named $(APP)"
+	$t mkdir $(APP)/
+	$t cp ../erlang.mk $(APP)/
+	$t $(MAKE) -C $(APP) -f erlang.mk bootstrap-lib $v
+
+	$i "Generate .erl test files"
+	$t mkdir $(APP)/test/
+	$t printf "%s\n" "-module(use_blue)." > $(APP)/test/use_blue.erl
+	$t printf "%s\n" "-module(use_red)." > $(APP)/test/use_red.erl
+
+	$i "Build the application testsuite"
+	$t $(MAKE) -C $(APP) test-build $v
+
+	$i "Check that all compiled files exist"
+	$t test -f $(APP)/test/use_blue.beam
+	$t test -f $(APP)/test/use_red.beam
+
+	$t $(SLEEP)
+	$t touch $(APP)/build-1
+
+	$i "Re-un the make command; check that nothing is rebuilt"
+	$t $(MAKE) -C $(APP) test-build $v
+	$t test $(APP)/test/use_blue.beam -ot $(APP)/build-1
+	$t test $(APP)/test/use_red.beam -ot $(APP)/build-1
+
+	$i "Touch one .erl file; check that only required files are rebuilt"
+	$t $(SLEEP)
+	$t touch $(APP)/test/use_blue.erl
+	$t $(MAKE) -C $(APP) test-build $v
+	$t test $(APP)/test/use_blue.beam -nt $(APP)/build-1
+	$t test $(APP)/test/use_red.beam -ot $(APP)/build-1
+
+	$t touch $(APP)/build-2
+
+	$i "Touch one Makefile; check that all files are rebuilt"
+	$t $(SLEEP)
+	$t touch $(APP)/Makefile
+	$t $(MAKE) -C $(APP) test-build $v
+	$t test $(APP)/test/use_blue.beam -nt $(APP)/build-2
+	$t test $(APP)/test/use_red.beam -nt $(APP)/build-2
-- 
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