ADDED: Support for SDL building on Makefile

examples/Makefile

@@ -1,6 +1,25 @@
 #**************************************************************************************************
 #
-#   raylib makefile for Desktop platforms, Raspberry Pi, Android and HTML5
+#   raylib makefile for multiple platforms
+#
+#   This file supports building raylib examples for the following platforms:
+#
+#     - PLATFORM_DESKTOP (GLFW backend):
+#         > Windows (Win32, Win64)
+#         > Linux (X11/Wayland desktop mode)
+#         > macOS/OSX (x64, arm64)
+#         > FreeBSD, OpenBSD, NetBSD, DragonFly (X11 desktop)
+#     - PLATFORM_DESKTOP_SDL (SDL backend):
+#         > Windows (Win32, Win64)
+#         > Linux (X11/Wayland desktop mode)
+#         > Others (not tested)
+#     - PLATFORM_WEB:
+#         > HTML5 (WebAssembly)
+#     - PLATFORM_DRM:
+#         > Raspberry Pi 0-5 (no X11/Wayland)
+#         > Linux native mode (KMS driver)
+#     - PLATFORM_ANDROID:
+#         > Android (ARM, ARM64)
 #
 #   Copyright (c) 2013-2023 Ramon Santamaria (@raysan5)
 #
@@ -25,7 +44,7 @@
 
 # Define required environment variables
 #------------------------------------------------------------------------------------------------
-# Define target platform: PLATFORM_DESKTOP, PLATFORM_DRM, PLATFORM_ANDROID, PLATFORM_WEB
+# Define target platform: PLATFORM_DESKTOP, PLATFORM_DESKTOP_SDL, PLATFORM_DRM, PLATFORM_ANDROID, PLATFORM_WEB
 PLATFORM              ?= PLATFORM_DESKTOP
 
 # Define required raylib variables
@@ -47,6 +66,11 @@ BUILD_MODE            ?= RELEASE
 # Use external GLFW library instead of rglfw module
 USE_EXTERNAL_GLFW     ?= FALSE
 
+# PLATFORM_DESKTOP_SDL: It requires SDL library to be provided externally
+# WARNING: Library is not included in raylib, it MUST be configured by users
+SDL_INCLUDE_PATH      ?= $(RAYLIB_SRC_PATH)/external/SDL2-2.28.4/include
+SDL_LIBRARY_PATH      ?= $(RAYLIB_SRC_PATH)/external/SDL2-2.28.4/lib/x64
+
 # Use Wayland display server protocol on Linux desktop (by default it uses X11 windowing system)
 # NOTE: This variable is only used for PLATFORM_OS: LINUX
 USE_WAYLAND_DISPLAY   ?= FALSE
@@ -58,8 +82,8 @@ BUILD_WEB_HEAP_SIZE   ?= 134217728
 BUILD_WEB_RESOURCES   ?= TRUE
 BUILD_WEB_RESOURCES_PATH  ?= $(dir $<)resources@resources
 
-# Determine PLATFORM_OS in case PLATFORM_DESKTOP or PLATFORM_WEB selected
-ifeq ($(PLATFORM),$(filter $(PLATFORM),PLATFORM_DESKTOP PLATFORM_WEB))
+# Determine PLATFORM_OS when required
+ifeq ($(PLATFORM),$(filter $(PLATFORM),PLATFORM_DESKTOP PLATFORM_DESKTOP_SDL PLATFORM_WEB))
     # No uname.exe on MinGW!, but OS=Windows_NT on Windows!
     # ifeq ($(UNAME),Msys) -> Windows
     ifeq ($(OS),Windows_NT)
@@ -224,6 +248,9 @@ ifeq ($(PLATFORM),PLATFORM_DESKTOP)
         INCLUDE_PATHS += -I$(RAYLIB_INCLUDE_PATH)
     endif
 endif
+ifeq ($(PLATFORM),PLATFORM_DESKTOP_SDL)
+    INCLUDE_PATHS += -I$(SDL_INCLUDE_PATH)
+endif
 ifeq ($(PLATFORM),PLATFORM_DRM)
     INCLUDE_PATHS += -I$(RAYLIB_INCLUDE_PATH)
     INCLUDE_PATHS += -I/usr/include/libdrm
@@ -254,6 +281,17 @@ ifeq ($(PLATFORM),PLATFORM_DESKTOP)
         LDFLAGS += -Lsrc -L$(RAYLIB_LIB_PATH)
     endif
 endif
+ifeq ($(PLATFORM),PLATFORM_DESKTOP_SDL)
+    ifeq ($(PLATFORM_OS),WINDOWS)
+        # NOTE: The resource .rc file contains windows executable icon and properties
+        LDFLAGS += $(RAYLIB_PATH)/src/raylib.rc.data
+        # -Wl,--subsystem,windows hides the console window
+        ifeq ($(BUILD_MODE), RELEASE)
+            LDFLAGS += -Wl,--subsystem,windows
+        endif
+    endif
+    LDFLAGS += -L$(SDL_LIBRARY_PATH)
+endif
 ifeq ($(PLATFORM),PLATFORM_WEB)
     # -Os                        # size optimization
     # -O2                        # optimization level 2, if used, also set --memory-init-file 0
@@ -346,6 +384,34 @@ ifeq ($(PLATFORM),PLATFORM_DESKTOP)
         LDLIBS += -lglfw
     endif
 endif
+ifeq ($(PLATFORM),PLATFORM_DESKTOP_SDL)
+    ifeq ($(PLATFORM_OS),WINDOWS)
+        # Libraries for Windows desktop compilation
+        LDLIBS = -lraylib -lSDL2 -lSDL2main -lopengl32 -lgdi32
+    endif
+    ifeq ($(PLATFORM_OS),LINUX)
+        # Libraries for Debian GNU/Linux desktop compiling
+        # NOTE: Required packages: libegl1-mesa-dev
+        LDLIBS = -lraylib -lSDL2 -lSDL2main -lGL -lm -lpthread -ldl -lrt
+
+        # On X11 requires also below libraries
+        LDLIBS += -lX11
+        # NOTE: It seems additional libraries are not required any more, latest GLFW just dlopen them
+        #LDLIBS += -lXrandr -lXinerama -lXi -lXxf86vm -lXcursor
+
+        # On Wayland windowing system, additional libraries requires
+        ifeq ($(USE_WAYLAND_DISPLAY),TRUE)
+            LDLIBS += -lwayland-client -lwayland-cursor -lwayland-egl -lxkbcommon
+        endif
+        # Explicit link to libc
+        ifeq ($(RAYLIB_LIBTYPE),SHARED)
+            LDLIBS += -lc
+        endif
+
+        # NOTE: On ARM 32bit arch, miniaudio requires atomics library
+        LDLIBS += -latomic
+    endif
+endif
 ifeq ($(PLATFORM),PLATFORM_DRM)
     # Libraries for DRM compiling
     # NOTE: Required packages: libasound2-dev (ALSA)