Build: Add GNU Make based build infrastructure

Currently covers:
* the build options (minus hardening) of the "tool" (original shell build script)
* clang
* macos

Makefile

@@ -1,16 +1,9 @@
-all: release
+.PHONY: all src clean
 
-.PHONY: debug
-debug:
-	@./tool build -d --portmidi orca
+all: src
 
-.PHONY: release
-release:
-	@./tool build --portmidi orca
-	@echo "Executable program saved as: build/orca" >&2
-	@echo "To run it, simply execute it:" >&2
-	@echo "$$ build/orca" >&2
+src:
+	$(MAKE) -C src
 
-.PHONY: clean
 clean:
-	@./tool clean
+	$(MAKE) -C src clean

Makefile.conf

@@ -0,0 +1,67 @@
+TARGET=tui_main
+
+LANG_VERSION=c99
+
+# Build option defaults
+PREFIX?=/opt/local
+DEBUG?=1
+PORTMIDI_ENABLED?=1
+MOUSE_ENABLED?=1
+
+CFLAGS+=\
+    -finput-charset=UTF-8 \
+    -Wall \
+    -Wpedantic \
+    -Wextra \
+    -Wwrite-strings \
+    -Wconversion \
+    -Wshadow \
+    -Wstrict-prototypes \
+    -Werror=implicit-function-declaration \
+    -Werror=implicit-int \
+    -Werror=incompatible-pointer-types \
+    -Werror=int-conversion \
+    -Wno-missing-field-initializers \
+    -DORCA_OS_MAC \
+    -D_XOPEN_SOURCE_EXTENDED=1 \
+    -march=nehalem \
+    -fcolor-diagnostics
+
+LDFLAGS_NCURSES=$(shell pkg-config --libs ncursesw formw)
+LDFLAGS+=$(LDFLAGS_NCURSES)
+
+
+######### Overrides from build.conf #########
+HERE:=$(dir $(lastword $(MAKEFILE_LIST)))
+-include $(HERE)build.conf
+
+CFLAGS+=-std=$(LANG_VERSION)
+CFLAGS+=-I$(PREFIX)/include
+LDFLAGS+=-L$(PREFIX)/lib
+
+ifeq ($(DEBUG),1)
+    CFLAGS+=\
+    -g \
+    -O0 \
+    -DDEBUG \
+#     -fsanitize=address \
+#     -fsanitize=undefined \
+#     -fsanitize=float-divide-by-zero \
+#     -fsanitize=implicit-conversion \
+#     -fsanitize=unsigned-integer-overflow
+else
+    CFLAGS+=\
+    -DNDEBUG \
+    -O2 \
+    -g0
+endif
+
+ifeq ($(PORTMIDI_ENABLED),1)
+    LDFLAGS+= -lportmidi
+    CFLAGS+= -DFEAT_PORTMIDI
+endif
+
+ifeq ($(MOUSE_ENABLED),0)
+    CFLAGS+=-DFEAT_NOMOUSE
+endif
+

build.conf

@@ -0,0 +1,5 @@
+# The following values reflect the defaults
+PREFIX?=/opt/local
+DEBUG?=1
+PORTMIDI_ENABLED?=1
+MOUSE_ENABLED?=1