Notes

# Created by Dima Sushchenko
# Date: 20.05.2021
# Makefile to build a project from .cpp files.
#

# Chosen compiler
CC = g++

# Flags for two build modes
RELEASE_FLAGS = -O2 -s -DNDEBUG
DEBUG_FLAGS = -O0 -g

# EXECUTABLE - EXECUTABLE - use unix commands to find a file with the 'main ()' function and only returns the filename
# COUNTER - returns size of list .cpp files with 'main ()' function
# SOURCES - returns list of all .cpp files
EXECUTABLE = $(shell grep -ril ' main *()*' . | grep -i ".*cpp" | sed -r 's/^./(w+/)+//' | sed -r 's/.cpp//')
COUNTER = $(shell grep -ril ' main *()*' . | grep -i ".*cpp" | wc -l)
SOURCES = $(shell find . -name '*.cpp')

# Standard is release
all: release

# If there are more than one files with the 'main ()' function,
then they give an error
check:
ifneq ($(COUNTER),1)
$(error More then one 'main ()' function)
endif

# Release build
release: check
$(CC) $(RELEASE_FLAGS) $(SOURCES) -o $(EXECUTABLE)

# Debug build
debug: check
$(CC) $(DEBUG_FLAGS) $(SOURCES) -o $(EXECUTABLE)