Created GNUmakefile and added coding style checker

GNUmakefile

@@ -0,0 +1,28 @@
+OUTPUT=so-cpp
+SOURCES=$(wildcard *.c)
+LIBRARY=none
+INCPATHS=include
+LIBPATHS=
+LDFLAGS=
+CCFLAGS=-c -Wall -g -Wextra -Werror
+CC=gcc
+CODING_STYLE_CHECKER=checkpatch_wrapper.sh
+
+OBJECTS=$(SOURCES:.c=.o) 
+
+INCFLAGS=$(foreach TMP,$(INCPATHS),-I$(TMP))
+LIBFLAGS=$(foreach TMP,$(LIBPATHS),-L$(TMP))
+
+all: $(SOURCES) $(OUTPUT) 
+
+coding_style:
+	./$(CODING_STYLE_CHECKER) $(SOURCES) $(INCPATHS)/*
+
+$(OUTPUT): $(OBJECTS)
+	$(CC) $(LIBFLAGS) $(OBJECTS) $(LDFLAGS) -o $@
+
+.c.o:
+	$(CC) $(INCFLAGS) $(CCFLAGS) -fPIC $< -o $@
+
+clean: 
+	rm -f $(OUTPUT) $(OBJECTS)

checkpatch_wrapper.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+
+CHECKPATCH=$(which checkpatch.pl 2> /dev/null)
+
+if [ -z "$CHECKPATCH" ]; then
+	echo "checkpatch.pl (https://raw.githubusercontent.com/torvalds/linux/master/scripts/checkpatch.pl) not in \$PATH"
+	exit 1
+fi
+
+COMMON_IGNORE_FLAGS=SPLIT_STRING,SSCANF_TO_KSTRTO,NEW_TYPEDEFS,VOLATILE,INLINE,USE_FUNC,AVOID_EXTERNS,CONST_STRUCT
+LIN_IGNORE_FLAGS=$COMMON_IGNORE_FLAGS
+WIN_IGNORE_FLAGS=$COMMON_IGNORE_FLAGS,DOS_LINE_ENDINGS
+
+if [ $(uname -s) = "Linux" ]; then
+	IGNORE_FLAGS=$LIN_IGNORE_FLAGS
+else
+	IGNORE_FLAGS=$WIN_IGNORE_FLAGS
+fi
+
+CHECKPATCH_ARGS="--no-tree --no-summary --terse --show-types
+	--ignore $IGNORE_FLAGS"
+
+if [ $# -eq 1 ]; then
+	$CHECKPATCH $CHECKPATCH_ARGS -f $1
+else
+	find . -type f -iregex '.*\.\(c\|h\|cpp\|hpp\|cc\|hh\|cxx\|hxx\)' | \
+		xargs $CHECKPATCH $CHECKPATCH_ARGS -f
+fi
+