Added a test case for moving CORE_LIB in PR #583.

This patch is meant to test the link order, if the OTHER_OBJS
variable gets used to add 3rd party archives, that depend on the
Arduino core lib (the archive pointed to by the CORE_LIB variable).

The examples/Blink3rdPartyLib directory contains a stripped down Blink
and includes a library in the examples/Blink3rdPartyLib/Toggle
sub-directory. The archive, built inside the Toggle directory mimics a
3rd party library. The archive gets built and linked in by using the
OTHER_OBS variable in examples/Blink3rdPartyLib/Makefile.

HISTORY.md

@@ -5,6 +5,7 @@ The following is the rough list of changes that went into different versions.
 I tried to give credit whenever possible. If I have missed anyone, kindly add it to the list.
 
 ### In Development
+- Fix: Moved CORE_LIB to the last position of the defined linked objects. (https://github.com/wingunder)
 - Fix: Moved ATtiny examples to ATtinyBlink, updated alternate core instructions (issue #537) (https://github.com/sej7278)
 - Fix: Add -fno-devirtualize flag to workaround g++ segfault bug (issue #486). (https://github.com/sej7278)
 - Fix: Quote the prefix tag in the space_pad_to function

examples/Blink3rdPartyLib/Blink3rdPartyLib.cpp

@@ -0,0 +1,23 @@
+// A derived Blink, that uses an example 3rd party library.
+// Turns on an LED on for one second, then off for one second, repeatedly.
+// This example code is in the public domain.
+
+#include <TogglePin.h>
+
+#ifdef ARDUINO
+#if ARDUINO >= 100
+#include "Arduino.h"
+#else
+#include "WProgram.h"
+#endif
+#endif // ARDUINO
+
+int main()
+{
+	init();
+	TogglePin led(13, false);
+	while (true) {
+		delay(1000);
+		led.toggle();
+	}
+}

examples/Blink3rdPartyLib/Makefile

@@ -0,0 +1,24 @@
+# This program is free software and is licensed under the same conditions as
+# describe in https://github.com/sudar/Arduino-Makefile/blob/master/licence.txt
+
+# This is an example Makefile, that demonstrates the linking of a third party
+# library. In this case the third party library resides in the ./Toggle
+# sub-directory. Note that the archive TOGGLE_ARCHIVE _only_ contains the
+# compiled Toggle.c.o object. The TOGGLE_ARCHIVE is thus very lean, but it
+# requires the Arduino libraries, which are being build in this directory,
+# together with Blink, the 'main' program.
+
+include board.mk
+
+TOGGLE_ARCHIVE = build-$(BOARD_TAG)/libtoggle.a
+
+CXXFLAGS += -IToggle
+OTHER_OBJS = Toggle/$(TOGGLE_ARCHIVE)
+
+include ../../Arduino.mk
+
+Toggle/$(TOGGLE_ARCHIVE):
+	$(MAKE) -C Toggle $(TOGGLE_ARCHIVE)
+
+clean::
+	$(MAKE) -C Toggle clean

examples/Blink3rdPartyLib/Toggle/Makefile

@@ -0,0 +1,14 @@
+# This program is free software and is licensed under the same conditions as
+# describe in https://github.com/sudar/Arduino-Makefile/blob/master/licence.txt
+
+# This is an example Makefile, that is being used to build an archive
+# from locally compiled objects.
+#
+# All source files in this directory will automatically get compiled
+# and archived into the build-$(BOARD_TAG)/libtoggle.a target.
+
+include ../board.mk
+include ../../../Arduino.mk
+
+build-$(BOARD_TAG)/libtoggle.a: $(LOCAL_OBJS)
+	$(AR) rcs $@ $(LOCAL_OBJS)

examples/Blink3rdPartyLib/Toggle/TogglePin.cpp

@@ -0,0 +1,27 @@
+// This program is free software and is licensed under the same conditions as
+// describe in https://github.com/sudar/Arduino-Makefile/blob/master/licence.txt
+
+#include "TogglePin.h"
+
+#ifdef ARDUINO
+#if ARDUINO >= 100
+#include "Arduino.h"
+#else
+#include "WProgram.h"
+#endif
+#endif // ARDUINO
+
+TogglePin::TogglePin(int pinNumber, bool state)
+	: _pinNumber(pinNumber), _state(state)
+{
+	pinMode(_pinNumber, OUTPUT);
+	digitalWrite(_pinNumber, _state ? HIGH : LOW);
+}
+
+bool
+TogglePin::toggle()
+{
+	_state = !_state;
+	digitalWrite(_pinNumber, _state ? HIGH : LOW);
+	return _state;
+}

examples/Blink3rdPartyLib/Toggle/TogglePin.h

@@ -0,0 +1,19 @@
+// This program is free software and is licensed under the same conditions as
+// describe in https://github.com/sudar/Arduino-Makefile/blob/master/licence.txt
+
+#ifndef TOGGLEPIN_H_
+#define TOGGLEPIN_H_
+
+class TogglePin
+{
+ public:
+	TogglePin(int pinNumber, bool state);
+
+	bool toggle();
+
+ private:
+	const int _pinNumber;
+	bool _state;
+};
+
+#endif

examples/Blink3rdPartyLib/board.mk

@@ -0,0 +1,7 @@
+# This program is free software and is licensed under the same conditions as
+# describe in https://github.com/sudar/Arduino-Makefile/blob/master/licence.txt
+
+# The following can be overridden at make-time, by setting an environment
+# variable with the same name. eg. BOARD_TAG=pro5v328 make
+
+BOARD_TAG ?= uno