Improve build for Linux using Makefile

.gitignore

@@ -27,3 +27,10 @@ vs2019_project/pt2-clone/Debug/pt2-clone.vcxproj.FileListAbsolute.txt
 *.enc
 release/macos/pt2-clone-macos.app/Contents/MacOS/pt2-clone-macos
 pt_pal_editor/vs2019_project/pt_pal_editor/x64/Debug/pt_pal_editor.vcxproj.FileListAbsolute.txt
+
+/CMakeCache.txt
+/CMakeFiles/
+/build/
+/cmake_install.cmake
+release/other/pt2-clone
+/src/**/*.o

HOW-TO-COMPILE.txt

@@ -10,8 +10,7 @@ Compiled Windows/macOS binaries are always available at 16-bits.org/pt2.php
     Fedora: gcc gcc-c++ alsa-lib-devel SDL2-devel
     Others: www.google.com (you want gcc, g++ (or c++), alsa dev and SDL2 dev)
  2. Compile the PT2 clone:     (folder: "pt2-clone")
-    chmod +x make-linux.sh     (only needed once)
-    ./make-linux.sh
+    make -j2
  3. Copy pt2-clone/release/other/protracker.ini to ~/.config/protracker/
     (or ~/.protracker/).
     Make sure there are no config files in the same path as the
@@ -33,7 +32,6 @@ Compiled Windows/macOS binaries are always available at 16-bits.org/pt2.php
  2. Download the SDL 2 framework at https://www.libsdl.org
  3. Inside the package, copy SDL2.framework to /Library/Frameworks/
  4. Compile the PT2 clone:      (folder: "pt2-clone")
-    chmod +x make-macos.sh      (only needed once)
    ./make-macos.sh
  5. If you have more than one user in your OS, copy
     pt2-clone/release/macos/protracker.ini to ~/.config/protracker/

Makefile

@@ -0,0 +1,60 @@
+CC ?= gcc
+DESTDIR ?= /usr/local
+
+HAS_FLAC ?= 1
+DEFINES ?=
+
+CFLAGS ?= \
+	-O3 -march=native -mtune=native \
+	-Wall -Wextra \
+	-Wshadow -Winit-self -Wunused -Wunreachable-code \
+	-Wno-missing-field-initializers -Wno-unused-result \
+	-Wno-strict-aliasing -Wno-stringop-overflow
+
+LDFLAGS ?= -lSDL2 -lm
+
+SRC = $(wildcard \
+	src/gfx/*.c \
+	src/modloaders/*.c \
+	src/smploaders/*.c \
+)
+
+ifeq ($(HAS_FLAC), 1)
+	DEFINES += -DHAS_LIBFLAC
+	SRC += $(wildcard src/libflac/*.c)
+endif
+
+SRC += $(wildcard src/*.c)
+
+ifndef DEBUG
+	DEFINES += -DNDEBUG
+endif
+
+OUT_DIR = release/other
+OUT_FILE = $(OUT_DIR)/pt2-clone
+
+.PHONY: all clean
+
+all: $(OUT_FILE)
+
+OBJ = $(SRC:%.c=%.o)
+
+$(OUT_FILE): $(OBJ)
+	@mkdir -p $(OUT_DIR)
+	$(CC) $(OBJ) $(LDFLAGS) -o $(OUT_FILE)
+	@echo "Done. The executable can be found in '$(OUT_DIR)' if everything went well."
+
+%.o: %.c
+	@echo "CC $<"
+	@$(CC) $(DEFINES) $(CFLAGS) -c $< -o $@
+
+clean:
+	-rm -f $(OUT_FILE)
+	-rm -f $(SRC:%.c=%.o)
+
+USER_HOME ?= $(shell getent passwd $(SUDO_USER) | cut -d: -f6)
+USER_HOME := $(if $(USER_HOME),$(USER_HOME),$(HOME))
+
+install: $(OUT_FILE)
+	@install -v $(OUT_FILE) $(DESTDIR)/bin/
+	@install -vD $(OUT_DIR)/protracker.ini $(USER_HOME)/.config/protracker/protracker.ini