Add include dir and -I./include for headers

Makefile

@@ -30,7 +30,7 @@
 APP = myapp
 
 # C++ compiler
-#CXX:=clang++
+# CXX:=clang++
 CXX := g++ 
 
 
@@ -93,18 +93,41 @@ OBJS := $(patsubst $(SRC_DIR)/%.cpp,$(OBJ_DIR)/%.o,$(SRC))
 # -D_FORTIFY_SOURCE=2 -O2        # buffer overflow check. -D_FORTIFY_SOURCE=1 also possible 
 # -Wfloat-equal                  # testing floating-point numbers for equality is usually bad
 # -Wpointer-arith                # warn if anything depends upon the size of a function or of void
-_CXXFLAGS=-Wall -Wextra \
-        -Wconversion -Wsign-conversion \
-        -march=x86-64 \
-        -Wformat-security \
-        -fstack-protector-all -Wstack-protector --param ssp-buffer-size=4 \
-        -ftrapv \
-        -D_FORTIFY_SOURCE=2 -O2 \
-        -Wfloat-equal \
-        -Wpointer-arith 
+##_CXXFLAGS=-Wall -Wextra \
+##        -Wconversion -Wsign-conversion \
+##        -march=x86-64 \
+##        -Wformat-security \
+##        -fstack-protector-all -Wstack-protector --param ssp-buffer-size=4 \
+##        -ftrapv \
+##        -D_FORTIFY_SOURCE=2 -O2 \
+##        -Wfloat-equal \
+##        -Wpointer-arith 
+_CXXFLAGS=-Wall -Weffc++ -pedantic \
+        -pedantic-errors -Waggregate-return -Wcast-align \
+        -Wcast-qual -Wchar-subscripts -Wcomment  \
+        -Wdisabled-optimization \
+        -Wformat  -Wformat=2 \
+        -Wformat-nonliteral -Wformat-security  \
+        -Wformat-y2k \
+        -Wimport -Winit-self -Winline \
+        -Winvalid-pch \
+        -Wlong-long -Wmissing-braces \
+        -Wmissing-format-attribute   \
+        -Wmissing-include-dirs -Wmissing-noreturn \
+        -Wpacked  -Wparentheses  -Wpointer-arith \
+        -Wredundant-decls -Wreturn-type \
+        -Wsequence-point  -Wshadow -Wsign-compare -fstack-protector-all -Wstack-protector \
+        -Wstrict-aliasing -Wstrict-aliasing=2 -Wswitch  -Wswitch-default \
+        -Wswitch-enum -Wtrigraphs   \
+        -Wunknown-pragmas  -Wunreachable-code  \
+        -Wvariadic-macros \
+        -Wvolatile-register-var  -Wwrite-strings\
+        -Werror=return-type  \
+        -Werror=narrowing \
+	-ftrapv -Wfloat-equal -Wpointer-arith \
+	-D_FORTIFY_SOURCE=2 -O2
 
-
-CXXFLAGS = $(NETBEANSBUILD) $(DBG_REL) $(_CXXFLAGS) 
+CXXFLAGS = $(NETBEANSBUILD) $(DBG_REL) $(_CXXFLAGS) -I./include/ 
 LIBS = $(NETBEANSBUILD)
 
 # Uncomment one of the following to select an output format

include/add.h

@@ -0,0 +1,20 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/cppFiles/file.h to edit this template
+ */
+
+/* 
+ * File:   add.h
+ * Author: benn
+ *
+ * Created on February 24, 2023, 11:07 PM
+ */
+
+#ifndef ADD_H
+#define ADD_H
+
+int add(int x, int y);
+
+
+#endif /* ADD_H */
+