From daa29e49c6517e98a3d467b303ddec6c108352a7 Mon Sep 17 00:00:00 2001
From: Berenguer Montserrat <berenguer.95@gmail.com>
Date: Sun, 28 Jul 2019 11:39:44 +0200
Subject: [PATCH] Modified Makefile to create a shared library

Modified Makefile to create a easy to link shard library for e-Paper display
driver for Raspberry Pi (C code).

This way, it is more easy to link against this code when creating custom
projects which use that e-paper screen.

* Reorganized src variables
* Created 2 new targets: make lib and make example (and make all)
* make clean now does not file if files do not exist
* make clean removes bin directory. There is a target which create it
automatically
---
 Raspberry Pi/c/Makefile | 46 ++++++++++++++++++++++++++++++-----------
 1 file changed, 34 insertions(+), 12 deletions(-)

diff --git a/Raspberry Pi/c/Makefile b/Raspberry Pi/c/Makefile
index f8a4e18..b74f646 100644
--- a/Raspberry Pi/c/Makefile	
+++ b/Raspberry Pi/c/Makefile	
@@ -1,14 +1,28 @@
+# Make sure to run make on the same directory where Makefile is located
+# Make sure to execute the example "epd" as sudo and in the same directory where Makefile is located
+
 DIR_Config   = ./lib/Config
 DIR_EPD      = ./lib/e-Paper
 DIR_FONTS    = ./lib/Fonts
 DIR_GUI      = ./lib/GUI
 DIR_Examples = ./examples
 DIR_BIN      = ./bin
+DIR_LIB		 = "$(shell pwd)"
 
-OBJ_C = $(wildcard ${DIR_EPD}/*.c ${DIR_Config}/*.c ${DIR_GUI}/*.c ${DIR_Examples}/*.c ${DIR_FONTS}/*.c)
-OBJ_O = $(patsubst %.c,${DIR_BIN}/%.o,$(notdir ${OBJ_C}))
+SRC_EPD = $(wildcard ${DIR_EPD}/*.c)
+SRC_Config = $(wildcard ${DIR_Config}/*.c)
+SRC_GUI = $(wildcard ${DIR_GUI}/*.c)
+SRC_Examples = $(wildcard ${DIR_Examples}/*.c)
+SRC_FONTS = $(wildcard ${DIR_FONTS}/*.c)
 
-TARGET = epd
+SRC_LIB = $(SRC_EPD) $(SRC_Config) $(SRC_GUI) $(SRC_FONTS)
+OBJ_LIB = $(patsubst %.c,${DIR_BIN}/%.o,$(notdir ${SRC_LIB}))
+
+SRC_EXAMPLE = $(SRC_Examples)
+OBJ_EXAMPLE = $(patsubst %.c,${DIR_BIN}/%.o,$(notdir ${SRC_EXAMPLE}))
+
+TARGET_LIB = libepd.so
+TARGET_EXAMPLE = epd
 
 USELIB = USE_BCM2835_LIB
 # USELIB = USE_WIRINGPI_LIB
@@ -20,12 +34,20 @@ else ifeq ($(USELIB), USE_WIRINGPI_LIB)
 endif
 
 CC = gcc
-MSG = -g -O0 -Wall
+MSG = -g -O0 -Wall -fpic
 CFLAGS += $(MSG) $(DEBUG)
 
-${TARGET}:${OBJ_O}
-	$(CC) $(CFLAGS) $(OBJ_O) -o $@ $(LIB)
-    
+all: make_bin_dir lib example
+
+make_bin_dir: 
+	mkdir -p $(DIR_BIN)
+
+lib: make_bin_dir $(OBJ_LIB)
+	$(CC) -shared -o $(TARGET_LIB) $(OBJ_LIB) $(LIB)
+
+example: make_bin_dir lib $(OBJ_EXAMPLE)
+	$(CC) $(CFLAGS) $(OBJ_EXAMPLE) -o $(TARGET_EXAMPLE) $(LIB) -L$(DIR_LIB) -lepd -Wl,-rpath=$(DIR_LIB)
+
 ${DIR_BIN}/%.o:$(DIR_Examples)/%.c
 	$(CC) $(CFLAGS) -c  $< -o $@ -I $(DIR_Config) -I $(DIR_GUI) -I $(DIR_EPD)
     
@@ -40,8 +62,8 @@ ${DIR_BIN}/%.o:$(DIR_FONTS)/%.c
     
 ${DIR_BIN}/%.o:$(DIR_GUI)/%.c
 	$(CC) $(CFLAGS) -c  $< -o $@ -I $(DIR_Config)
-    
-	
-clean :
-	rm $(DIR_BIN)/*.* 
-	rm $(TARGET) 
\ No newline at end of file
+
+
+clean:
+	rm -rf $(DIR_BIN)
+	rm -f $(TARGET_EXAMPLE) $(TARGET_LIB)