[enhancement] cleaning of SDK integration and makefiles syntax

Makefile

@@ -1,28 +1,33 @@
+###################################################################
+# About the library name and path
+###################################################################
+
+# library name, without extension
 LIB_NAME ?= libiso7816
 
+# project root directory, relative to app dir
 PROJ_FILES = ../../
-LIB_FULL_NAME = $(LIB_NAME).a
 
-VERSION = 1
-#############################
+# library name, with extension
+LIB_FULL_NAME = $(LIB_NAME).a
 
+# SDK helper Makefiles inclusion
 -include $(PROJ_FILES)/Makefile.conf
 -include $(PROJ_FILES)/Makefile.gen
 
 # use an app-specific build dir
 APP_BUILD_DIR = $(BUILD_DIR)/libs/$(LIB_NAME)
 
-CFLAGS += $(LIBS_CFLAGS)
-CFLAGS += -ffreestanding
-CFLAGS += $(DRIVERS_CFLAGS)
-CFLAGS += -I$(PROJ_FILES)/include/generated -I$(PROJ_FILES) -I$(PROJ_FILES)/libs/std -I$(PROJ_FILES)/kernel/shared -I.
-# dependency on lower iso7816 interface
-CFLAGS += -MMD -MP
+###################################################################
+# About the compilation flags
+###################################################################
 
-LDFLAGS += -fno-builtin -nostdlib -nostartfiles
-LD_LIBS += -lg
+CFLAGS := $(LIBS_CFLAGS)
+CFLAGS += -MMD -MP
 
-BUILD_DIR ?= $(PROJ_FILE)build
+#############################################################
+# About library sources
+#############################################################
 
 SRC_DIR = .
 SRC = $(wildcard $(SRC_DIR)/*.c)
@@ -37,6 +42,11 @@ TODEL_CLEAN += $(OBJ)
 # targets
 TODEL_DISTCLEAN += $(APP_BUILD_DIR)
 
+##########################################################
+# generic targets of all libraries makefiles
+##########################################################
+
+
 .PHONY: app doc
 
 default: all

smartcard_iso7816.c

@@ -1,7 +1,7 @@
-#include "api/stdio.h"
-#include "api/nostd.h"
-#include "api/string.h"
-#include "api/syscall.h"
+#include "libc/stdio.h"
+#include "libc/nostd.h"
+#include "libc/string.h"
+#include "libc/syscall.h"
 #include "libdrviso7816.h"
 #include "api/libiso7816.h"
 

smartcard_print.h

@@ -2,8 +2,8 @@
 #define __SMARTCARD_PRINT_H__
 
 #include "autoconf.h"
-#include "api/stdio.h"
-#include "api/nostd.h"
+#include "libc/stdio.h"
+#include "libc/nostd.h"
 
 #define SMARTCARD_DEBUG CONFIG_SMARTCARD_DEBUG
 #define MEASURE_TOKEN_PERF