Ada Makefile

# Makefile
# Copyright (c) 2018 Justin Hanekom <justin_hanekom@yahoo.com>

rm      := rm --recursive --force
mkdir   := mkdir --parents

ada_version         := gnat2012

src_dir             := src
main_src_dir        := $(src_dir)/main/ada
test_src_dir        := $(src_dir)/test/ada
target_dir          := target
main_target_dir     := $(target_dir)/main/ada
test_target_dir     := $(target_dir)/test/ada
docs_dir            := $(target_dir)/docs

shared_or_static    := shared
optimization_level  := 2

src_file    := main.adb
main_app    := fizzbuzz
test_file   := test_runner.adb
test_app    := test_fizzbuzz

BASE_MAKE_FLAGS := $(BASE_MAKE_FLAGS) -$(ada_version) -$(shared_or_static) \
    -I$(main_src_dir) -C -E -gnata -gnatF -gnatn -gnatwae -gnatwl -gnaty-o \
    -k -m -s
MAKE_FLAGS  := $(MAKE_FLAGS) $(BASE_MAKE_FLAGS) -D $(main_target_dir) \
    -O$(optimization_level) -fstack-check -funroll-loops \
    -gnatyx3abcefhiIklL5M78nprStux
TEST_MAKE_FLAGS := $(DEBUG_FLAGS) $(BASE_MAKE_FLAGS) -D $(test_target_dir) \
    -I$(test_src_dir) -aI/usr/include/aunit -aI/GNAT/2018/include/aunit \
    -aL/usr/lib/aunit -aL/GNAT/2018/lib/aunit -g

.DEFAULT: all
.PHONY : all
all: main

.PHONY : main
main : init_dirs
    gnatmake $(MAKE_FLAGS) -o $(target_dir)/$(main_app) $(src_file)

.PHONY : test
test : main init_dirs
    gnatmake $(TEST_MAKE_FLAGS) -o $(target_dir)/$(test_app) $(test_file)

.PHONY : docs
docs : main init_dirs

.PHONY : clean
clean :
    -@$(rm) $(main_target_dir)/*
    -@$(rm) $(test_target_dir)/*
    -@$(rm) GNAT-TEMP-*

.PHONY : clobber
clobber : clean
    -@$(rm) target

.PHONY : init_dirs
init_dirs :
    -@$(mkdir) $(main_src_dir)
    -@$(mkdir) $(test_src_dir)
    -@$(mkdir) $(main_target_dir)
    -@$(mkdir) $(test_target_dir)
    -@$(mkdir) $(docs_dir)